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Groups > uk.tech.broadcast > #70556 > unrolled thread
| Started by | "J. P. Gilliver" <G6JPG@255soft.uk> |
|---|---|
| First post | 2026-09-26 19:08 +0100 |
| Last post | 2026-09-27 13:12 +0200 |
| Articles | 20 on this page of 143 — 23 participants |
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Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-26 19:08 +0100
Re: OT - TV Scott <newsgroups@gefion.myzen.co.uk> - 2026-09-26 19:58 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-26 20:30 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-27 09:39 +0100
Re: OT - TV JMB99 <mb@nospam.net> - 2026-09-28 08:08 +0100
Re: OT - TV Frank Slootweg <this@ddress.is.invalid> - 2026-09-26 19:10 +0000
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-26 21:02 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-26 21:03 +0100
Re: OT - TV Frank Slootweg <this@ddress.is.invalid> - 2026-09-27 18:20 +0000
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-28 16:26 +0100
Re: OT - TV Frank Slootweg <this@ddress.is.invalid> - 2026-09-28 15:45 +0000
Re: OT - TV Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-09-28 16:30 +0000
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-28 17:46 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-28 22:25 +0100
Re: OT - TV NY <me@privacy.net> - 2026-09-29 16:40 +0100
OT - Lehrer (was: Re: OT - TV) "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-29 16:58 +0100
Re: OT - Lehrer (was: Re: OT - TV) Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-09-29 18:19 +0000
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-29 20:57 +0100
Re: OT - Lehrer Charles Hope <clh@candehope.me.uk> - 2026-09-29 20:00 +0000
Re: OT - Lehrer (was: Re: OT - TV) André Coutanche <acoutanche@gmx.co.uk> - 2026-09-29 21:50 +0100
Re: OT - Lehrer NY <me@privacy.net> - 2026-09-29 22:33 +0100
Re: OT - Lehrer Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-09-29 22:48 +0000
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-30 01:07 +0100
Re: OT - Lehrer John Ames <commodorejohn@gmail.com> - 2026-09-30 15:51 -0700
Re: OT - Lehrer NY <me@privacy.net> - 2026-10-01 10:57 +0100
Re: OT - Lehrer NY <me@privacy.net> - 2026-09-30 08:10 +0100
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-30 01:39 +0100
Re: OT - Lehrer Roger Blake <rogblake@iname.invalid> - 2026-09-30 00:46 +0000
Re: OT - Lehrer NY <me@privacy.net> - 2026-09-29 22:39 +0100
Re: OT - Lehrer Frank Slootweg <this@ddress.is.invalid> - 2026-09-30 12:25 +0000
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-30 13:34 +0100
Re: OT - Lehrer The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 14:31 +0100
Re: OT - Lehrer NY <me@privacy.net> - 2026-09-30 14:47 +0100
Re: OT - Lehrer John Williamson <johnwilliamson@btinternet.com> - 2026-09-30 14:58 +0100
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-01 02:36 +0100
Re: OT - Lehrer NY <me@privacy.net> - 2026-10-01 11:12 +0100
Re: OT - Lehrer Frank Slootweg <this@ddress.is.invalid> - 2026-10-01 14:35 +0000
Re: OT - Lehrer NY <me@privacy.net> - 2026-10-01 16:14 +0100
Re: OT - Lehrer Frank Slootweg <this@ddress.is.invalid> - 2026-10-01 17:35 +0000
Re: OT - Lehrer Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-10-01 17:53 +0000
Re: OT - Lehrer John Williamson <johnwilliamson@btinternet.com> - 2026-10-01 19:03 +0100
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-01 21:50 +0100
Re: OT - Lehrer The Natural Philosopher <tnp@invalid.invalid> - 2026-10-02 12:25 +0100
Re: OT - Lehrer The Natural Philosopher <tnp@invalid.invalid> - 2026-10-01 11:13 +0100
Re: OT - Lehrer NY <me@privacy.net> - 2026-10-01 11:51 +0100
Re: OT - Lehrer John Williamson <johnwilliamson@btinternet.com> - 2026-09-30 14:55 +0100
Re: OT - Lehrer Charles Hope <clh@candehope.me.uk> - 2026-09-30 14:15 +0000
Re: OT - TV Daniel70 <daniel47@nomail.afraid.org> - 2026-09-27 19:58 +1000
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-27 12:52 +0100
Re: OT - TV Daniel70 <daniel47@nomail.afraid.org> - 2026-09-27 22:13 +1000
[OT] - audio distribution, Rediffusion-style (was: Re: OT - TV) "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-28 16:43 +0100
Re: OT - TV Max Demian <max_demian@bigfoot.com> - 2026-09-27 11:44 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-27 16:12 +0100
Re: OT - TV Max Demian <max_demian@bigfoot.com> - 2026-09-27 18:12 +0100
Re: OT - TV Andy Burns <usenet@andyburns.uk> - 2026-09-27 18:23 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-27 18:34 +0100
Re: OT - TV Max Demian <max_demian@bigfoot.com> - 2026-09-28 14:03 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-28 15:56 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-28 16:46 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-28 17:16 +0100
Re: OT - TV Max Demian <max_demian@bigfoot.com> - 2026-09-29 12:01 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-29 13:05 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-29 13:25 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-29 14:13 +0100
Re: OT - TV The Other John <nomail@here.org> - 2026-09-29 16:53 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-29 17:12 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-30 10:22 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-30 13:36 +0100
Re: OT - TV "Carlos E.R." <robin_listas@es.invalid> - 2026-09-30 11:23 +0200
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 11:48 +0100
Re: OT - TV Paul <nospam@needed.invalid> - 2026-09-30 07:37 -0400
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 14:28 +0100
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 00:35 +0200
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-01 02:15 +0100
Re: OT - TV Paul <nospam@needed.invalid> - 2026-10-01 00:15 -0400
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-01 12:50 +0100
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 14:24 +0200
Re: OT - TV Max Demian <max_demian@bigfoot.com> - 2026-10-01 17:17 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-01 12:48 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-10-01 13:10 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-01 13:42 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-01 13:32 +0100
Re: OT - TV Frank Slootweg <this@ddress.is.invalid> - 2026-10-01 14:52 +0000
Re: OT - TV Daniel70 <daniel47@nomail.afraid.org> - 2026-10-03 21:10 +1000
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-03 13:39 +0200
Re: OT - TV Daniel70 <daniel47@nomail.afraid.org> - 2026-10-04 21:26 +1100
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-04 13:19 +0200
Re: OT - TV Paul <nospam@needed.invalid> - 2026-10-04 10:36 -0400
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-04 19:18 +0200
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-03 12:47 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-03 12:50 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-03 13:09 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-03 15:59 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-03 15:56 +0000
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-03 17:19 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-04 10:54 +0000
Re: OT - TV c186282 <c186282@nnada.net> - 2026-10-05 01:27 -0400
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-05 07:55 +0000
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-05 14:54 +0200
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-05 11:29 +0100
Re: OT - TV Andy Burns <usenet@andyburns.uk> - 2026-10-05 11:46 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-05 12:47 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-03 18:41 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-03 22:52 +0100
Re: OT - TV Paul <nospam@needed.invalid> - 2026-10-03 21:24 -0400
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-04 08:08 +0000
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-04 09:29 +0100
Re: OT - TV Roderick Stewart <rjfs@escapetime.myzen.co.uk> - 2026-09-30 15:13 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-29 13:16 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-09-29 15:54 +0000
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-29 17:15 +0100
Re: OT - TV "Carlos E.R." <robin_listas@es.invalid> - 2026-09-30 11:27 +0200
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-09-30 11:13 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-09-30 11:19 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 11:57 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-30 13:29 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-09-30 13:54 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 14:34 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-30 18:08 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-01 02:22 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-01 06:37 +0000
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-10-01 10:32 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-10-01 09:41 +0100
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 00:37 +0200
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 11:50 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-09-30 13:08 +0000
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 00:50 +0200
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-01 06:12 +0000
Re: OT - TV c186282 <c186282@nnada.net> - 2026-10-01 03:29 -0400
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 14:53 +0200
Re: OT - TV Paul <nospam@needed.invalid> - 2026-10-01 03:32 -0400
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 14:49 +0200
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-01 12:57 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-10-01 13:27 +0100
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 15:19 +0200
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-01 14:34 +0000
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-01 15:51 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-02 06:52 +0000
Re: OT - TV Andy Burns <usenet@andyburns.uk> - 2026-10-04 07:52 +0100
Re: OT - TV c186282 <c186282@nnada.net> - 2026-10-04 03:15 -0400
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-04 15:51 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-04 18:16 +0100
Re: OT - TV "Carlos E.R." <robin_listas@es.invalid> - 2026-09-27 13:12 +0200
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| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-01 13:42 +0100 |
| Message-ID | <ni72pdFs3m5U1@mid.individual.net> |
| In reply to | #70665 |
On 01/10/2026 13:10, Liz Tuddenham wrote: > The Natural Philosopher <tnp@invalid.invalid> wrote: > >> On 30/09/2026 23:35, Carlos E. R. wrote: >>> On 2026-09-30 15:28, The Natural Philosopher wrote: >>>> On 30/09/2026 12:37, Paul wrote: >>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: >>> >>> >>>> Automotive is 13.8V rated and that/s it. The alternators wont go >>>> higher. Which is why you use bridged amps >>> >>> I have seen 15 volts. >>> >>> >> The absolute max is supposed to be 14,4 > > That's the generally-accepted stabilised voltage for not over-charging > the battery but fast chargers and dynamo-driven systems can often exceed > that. Loose battery terminals can cause the regulator to overshoot and > inductive loads can generate very large spikes with a lot of stored > energy. > > For boats, we are now using Lithium Iron Phosphate batteries, which unlike lead acid, will accept the full charge current until the battery management system disconnects the charge source to avoid damaging the cells. This sudden disconnection causes the windings in the alternator to generate a spike which can easily destroy the rectifier diodes and regulator electronics. The spike contains tens of joules of energy, so can reach over 100 Volts depending on the other loads. For this reason, we always connect a lead acid battery to the alternator and use a DC-DC converter to charge the PiFePO4 batteries. -- Tciao for Now! John.
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| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-01 13:32 +0100 |
| Message-ID | <ni7271Fs13aU1@mid.individual.net> |
| In reply to | #70644 |
On 30/09/2026 23:35, Carlos E. R. wrote: > On 2026-09-30 15:28, The Natural Philosopher wrote: >> On 30/09/2026 12:37, Paul wrote: >>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: > > >> Automotive is 13.8V rated and that/s it. The alternators wont go >> higher. Which is why you use bridged amps > > I have seen 15 volts. > > Both the alternators I currently have in use go to 14.5 volts, as did the dynamo on the Land Rover.. All amps for Auto use are rated for slightly more than the alternator voltage for safety, and for really high power, require very low speaker impedances. The one on my boat is rated for full power into a 1 ohm load. -- Tciao for Now! John.
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| From | Frank Slootweg <this@ddress.is.invalid> |
|---|---|
| Date | 2026-10-01 14:52 +0000 |
| Message-ID | <119m338.o7c.1@ID-201911.user.individual.net> |
| In reply to | #70644 |
Carlos E. R. <robin_listas@es.invalid> wrote: > On 2026-09-30 15:28, The Natural Philosopher wrote: > > On 30/09/2026 12:37, Paul wrote: > >> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: > > > > Automotive is 13.8V rated and that/s it. The alternators wont go > > higher. Which is why you use bridged amps > > I have seen 15 volts. Yes, I see that as well, or values very close to 15V. The battery tester [1] I have, has a 'Good' range from 13.4-14.8V (with the engine running, i.e. the alternator providing power). [1] A simple one, plugged into the 'cigarette lighter' socket.
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| From | Daniel70 <daniel47@nomail.afraid.org> |
|---|---|
| Date | 2026-10-03 21:10 +1000 |
| Message-ID | <119qnr6$2urls$1@dont-email.me> |
| In reply to | #70676 |
On 2/10/2026 12:52 am, Frank Slootweg wrote: > Carlos E. R. <robin_listas@es.invalid> wrote: >> On 2026-09-30 15:28, The Natural Philosopher wrote: >>> On 30/09/2026 12:37, Paul wrote: >>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: >> >>> Automotive is 13.8V rated and that/s it. The alternators wont go >>> higher. Which is why you use bridged amps >> >> I have seen 15 volts. > > Yes, I see that as well, or values very close to 15V. > > The battery tester [1] I have, has a 'Good' range from 13.4-14.8V > (with the engine running, i.e. the alternator providing power). > > [1] A simple one, plugged into the 'cigarette lighter' socket. > (Not being very mechanically minded, myself but) I've thought for a long, long time that Battery Cells were 2.2Volts each so the six cells in a Car Battery gives 13.2Volts. When recharging a Battery, you want to apply a slightly higher Voltage ... (as the Battery will pull the charger Voltage down) so 13.4Volts up to about 14Volts would probably do the job well enough, although charging the Battery may take a while longer. 15Volts might cook the Battery. -- Daniel70
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| From | "Carlos E. R." <robin_listas@es.invalid> |
|---|---|
| Date | 2026-10-03 13:39 +0200 |
| Message-ID | <nic7s4Fk2g3U3@mid.individual.net> |
| In reply to | #70693 |
On 2026-10-03 13:10, Daniel70 wrote:
> On 2/10/2026 12:52 am, Frank Slootweg wrote:
>> Carlos E. R. <robin_listas@es.invalid> wrote:
>>> On 2026-09-30 15:28, The Natural Philosopher wrote:
>>>> On 30/09/2026 12:37, Paul wrote:
>>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote:
>>>
>>>> Automotive is 13.8V rated and that/s it. The alternators wont go
>>>> higher. Which is why you use bridged amps
>>>
>>> I have seen 15 volts.
>>
>> Yes, I see that as well, or values very close to 15V.
>>
>> The battery tester [1] I have, has a 'Good' range from 13.4-14.8V
>> (with the engine running, i.e. the alternator providing power).
>>
>> [1] A simple one, plugged into the 'cigarette lighter' socket.
>>
> (Not being very mechanically minded, myself but) I've thought for a
> long, long time that Battery Cells were 2.2Volts each so the six cells
> in a Car Battery gives 13.2Volts.
>
> When recharging a Battery, you want to apply a slightly higher
> Voltage ... (as the Battery will pull the charger Voltage down) so
> 13.4Volts up to about 14Volts would probably do the job well enough,
> although charging the Battery may take a while longer.
>
> 15Volts might cook the Battery.
They use voltages going to 30 volts to fast charge a battery. I'm not
sure of the exact figures, but I saw them once in the wikipedia.
--
Cheers,
Carlos E.R.
ES🇪🇸, EU🇪🇺.
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| From | Daniel70 <daniel47@nomail.afraid.org> |
|---|---|
| Date | 2026-10-04 21:26 +1100 |
| Message-ID | <119t9la$3qbm4$1@dont-email.me> |
| In reply to | #70694 |
On 3/10/2026 9:39 pm, Carlos E. R. wrote: > On 2026-10-03 13:10, Daniel70 wrote: >> On 2/10/2026 12:52 am, Frank Slootweg wrote: >>> Carlos E. R. <robin_listas@es.invalid> wrote: >>>> On 2026-09-30 15:28, The Natural Philosopher wrote: >>>>> On 30/09/2026 12:37, Paul wrote: >>>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: >>>> >>>>> Automotive is 13.8V rated and that/s it. The alternators wont go >>>>> higher. Which is why you use bridged amps >>>> >>>> I have seen 15 volts. >>> >>> Yes, I see that as well, or values very close to 15V. >>> >>> The battery tester [1] I have, has a 'Good' range from 13.4-14.8V >>> (with the engine running, i.e. the alternator providing power). >>> >>> [1] A simple one, plugged into the 'cigarette lighter' socket. >>> >> (Not being very mechanically minded, myself but) I've thought for a >> long, long time that Battery Cells were 2.2Volts each so the six cells >> in a Car Battery gives 13.2Volts. >> >> When recharging a Battery, you want to apply a slightly higher Voltage >> ... (as the Battery will pull the charger Voltage down) so 13.4Volts >> up to about 14Volts would probably do the job well enough, although >> charging the Battery may take a while longer. >> >> 15Volts might cook the Battery. > > They use voltages going to 30 volts to fast charge a battery. I'm not > sure of the exact figures, but I saw them once in the wikipedia. > Is that for Lead/Acid Car Batteries or for one or other of the newer variants?? -- Daniel70
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| From | "Carlos E. R." <robin_listas@es.invalid> |
|---|---|
| Date | 2026-10-04 13:19 +0200 |
| Message-ID | <nier1eF1topU7@mid.individual.net> |
| In reply to | #70711 |
On 2026-10-04 12:26, Daniel70 wrote:
> On 3/10/2026 9:39 pm, Carlos E. R. wrote:
>> On 2026-10-03 13:10, Daniel70 wrote:
>>> On 2/10/2026 12:52 am, Frank Slootweg wrote:
>>>> Carlos E. R. <robin_listas@es.invalid> wrote:
>>>>> On 2026-09-30 15:28, The Natural Philosopher wrote:
>>>>>> On 30/09/2026 12:37, Paul wrote:
>>>>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote:
>>>>>
>>>>>> Automotive is 13.8V rated and that/s it. The alternators wont go
>>>>>> higher. Which is why you use bridged amps
>>>>>
>>>>> I have seen 15 volts.
>>>>
>>>> Yes, I see that as well, or values very close to 15V.
>>>>
>>>> The battery tester [1] I have, has a 'Good' range from 13.4-14.8V
>>>> (with the engine running, i.e. the alternator providing power).
>>>>
>>>> [1] A simple one, plugged into the 'cigarette lighter' socket.
>>>>
>>> (Not being very mechanically minded, myself but) I've thought for a
>>> long, long time that Battery Cells were 2.2Volts each so the six
>>> cells in a Car Battery gives 13.2Volts.
>>>
>>> When recharging a Battery, you want to apply a slightly higher
>>> Voltage ... (as the Battery will pull the charger Voltage down) so
>>> 13.4Volts up to about 14Volts would probably do the job well enough,
>>> although charging the Battery may take a while longer.
>>>
>>> 15Volts might cook the Battery.
>>
>> They use voltages going to 30 volts to fast charge a battery. I'm not
>> sure of the exact figures, but I saw them once in the wikipedia.
>>
> Is that for Lead/Acid Car Batteries or for one or other of the newer
> variants??
Standard lead-acid, maybe gel variants. Chargers designed for
professionals, mounted on carts or trolleys.
To inject more amps in the battery, you need higher voltage. So rise the
voltage as much as needed, under a controller, to inject 50 amps (I
don't know the actual figure).
These things have instructions to disconnect the battery from the car
before starting, to avoid damage to the car electronics.
--
Cheers,
Carlos E.R.
ES🇪🇸, EU🇪🇺.
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| From | Paul <nospam@needed.invalid> |
|---|---|
| Date | 2026-10-04 10:36 -0400 |
| Message-ID | <119toa4$3vuoe$1@dont-email.me> |
| In reply to | #70713 |
On Sun, 10/4/2026 7:19 AM, Carlos E. R. wrote: > On 2026-10-04 12:26, Daniel70 wrote: >> On 3/10/2026 9:39 pm, Carlos E. R. wrote: >>> On 2026-10-03 13:10, Daniel70 wrote: >>>> On 2/10/2026 12:52 am, Frank Slootweg wrote: >>>>> Carlos E. R. <robin_listas@es.invalid> wrote: >>>>>> On 2026-09-30 15:28, The Natural Philosopher wrote: >>>>>>> On 30/09/2026 12:37, Paul wrote: >>>>>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: >>>>>> >>>>>>> Automotive is 13.8V rated and that/s it. The alternators wont go >>>>>>> higher. Which is why you use bridged amps >>>>>> >>>>>> I have seen 15 volts. >>>>> >>>>> Yes, I see that as well, or values very close to 15V. >>>>> >>>>> The battery tester [1] I have, has a 'Good' range from 13.4-14.8V >>>>> (with the engine running, i.e. the alternator providing power). >>>>> >>>>> [1] A simple one, plugged into the 'cigarette lighter' socket. >>>>> >>>> (Not being very mechanically minded, myself but) I've thought for a long, long time that Battery Cells were 2.2Volts each so the six cells in a Car Battery gives 13.2Volts. >>>> >>>> When recharging a Battery, you want to apply a slightly higher Voltage ... (as the Battery will pull the charger Voltage down) so 13.4Volts up to about 14Volts would probably do the job well enough, although charging the Battery may take a while longer. >>>> >>>> 15Volts might cook the Battery. >>> >>> They use voltages going to 30 volts to fast charge a battery. I'm not sure of the exact figures, but I saw them once in the wikipedia. >>> >> Is that for Lead/Acid Car Batteries or for one or other of the newer variants?? > > Standard lead-acid, maybe gel variants. Chargers designed for professionals, mounted on carts or trolleys. > > To inject more amps in the battery, you need higher voltage. So rise the voltage as much as needed, under a controller, to inject 50 amps (I don't know the actual figure). > > These things have instructions to disconnect the battery from the car before starting, to avoid damage to the car electronics. > And you avoid setting anything on fire or blowing something up. That's how you define a "battery limit". You have to use common sense, when working with these gorilla chargers. Paul
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| From | "Carlos E. R." <robin_listas@es.invalid> |
|---|---|
| Date | 2026-10-04 19:18 +0200 |
| Message-ID | <nifg3mF5jmcU1@mid.individual.net> |
| In reply to | #70714 |
On 2026-10-04 16:36, Paul wrote:
> On Sun, 10/4/2026 7:19 AM, Carlos E. R. wrote:
>> On 2026-10-04 12:26, Daniel70 wrote:
>>> On 3/10/2026 9:39 pm, Carlos E. R. wrote:
>>>> On 2026-10-03 13:10, Daniel70 wrote:
>>>>> On 2/10/2026 12:52 am, Frank Slootweg wrote:
>>>>>> Carlos E. R. <robin_listas@es.invalid> wrote:
>>>>>>> On 2026-09-30 15:28, The Natural Philosopher wrote:
>>>>>>>> On 30/09/2026 12:37, Paul wrote:
>>>>>>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote:
>>>>>>>
>>>>>>>> Automotive is 13.8V rated and that/s it. The alternators wont go
>>>>>>>> higher. Which is why you use bridged amps
>>>>>>>
>>>>>>> I have seen 15 volts.
>>>>>>
>>>>>> Yes, I see that as well, or values very close to 15V.
>>>>>>
>>>>>> The battery tester [1] I have, has a 'Good' range from 13.4-14.8V
>>>>>> (with the engine running, i.e. the alternator providing power).
>>>>>>
>>>>>> [1] A simple one, plugged into the 'cigarette lighter' socket.
>>>>>>
>>>>> (Not being very mechanically minded, myself but) I've thought for a long, long time that Battery Cells were 2.2Volts each so the six cells in a Car Battery gives 13.2Volts.
>>>>>
>>>>> When recharging a Battery, you want to apply a slightly higher Voltage ... (as the Battery will pull the charger Voltage down) so 13.4Volts up to about 14Volts would probably do the job well enough, although charging the Battery may take a while longer.
>>>>>
>>>>> 15Volts might cook the Battery.
>>>>
>>>> They use voltages going to 30 volts to fast charge a battery. I'm not sure of the exact figures, but I saw them once in the wikipedia.
>>>>
>>> Is that for Lead/Acid Car Batteries or for one or other of the newer variants??
>>
>> Standard lead-acid, maybe gel variants. Chargers designed for professionals, mounted on carts or trolleys.
>>
>> To inject more amps in the battery, you need higher voltage. So rise the voltage as much as needed, under a controller, to inject 50 amps (I don't know the actual figure).
>>
>> These things have instructions to disconnect the battery from the car before starting, to avoid damage to the car electronics.
>>
>
> And you avoid setting anything on fire or blowing something up.
>
> That's how you define a "battery limit".
>
> You have to use common sense, when working with these gorilla chargers.
You need some training. It was the office girl (a mechanic in theory
perhaps, but she worked in the garage reception) who did it, and fried
part of the electronics in my car.
--
Cheers,
Carlos E.R.
ES🇪🇸, EU🇪🇺.
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| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2026-10-03 12:47 +0100 |
| Message-ID | <119qq1d$2vglb$1@dont-email.me> |
| In reply to | #70693 |
On 03/10/2026 12:10, Daniel70 wrote: > (Not being very mechanically minded, myself but) I've thought for a > long, long time that Battery Cells were 2.2Volts each so the six cells > in a Car Battery gives 13.2Volts. > Nominal *fully charged* voltage is 13.4V, I think charging voltage is generally around 14.4V > When recharging a Battery, you want to apply a slightly higher Voltage > ... (as the Battery will pull the charger Voltage down) so 13.4Volts up > to about 14Volts would probably do the job well enough, although > charging the Battery may take a while longer. > > 15Volts might cook the Battery. Its unlikely that the alternator could supply enough current to raise it that high -- “Politics is the art of looking for trouble, finding it everywhere, diagnosing it incorrectly and applying the wrong remedies.” ― Groucho Marx
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| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-03 12:50 +0100 |
| Message-ID | <nic8gsFlgotU1@mid.individual.net> |
| In reply to | #70693 |
On 03/10/2026 12:10, Daniel70 wrote: > On 2/10/2026 12:52 am, Frank Slootweg wrote: >> Carlos E. R. <robin_listas@es.invalid> wrote: >>> On 2026-09-30 15:28, The Natural Philosopher wrote: >>>> On 30/09/2026 12:37, Paul wrote: >>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: >>> >>>> Automotive is 13.8V rated and that/s it. The alternators wont go >>>> higher. Which is why you use bridged amps >>> >>> I have seen 15 volts. >> >> Yes, I see that as well, or values very close to 15V. >> >> The battery tester [1] I have, has a 'Good' range from 13.4-14.8V >> (with the engine running, i.e. the alternator providing power). >> >> [1] A simple one, plugged into the 'cigarette lighter' socket. >> > (Not being very mechanically minded, myself but) I've thought for a > long, long time that Battery Cells were 2.2Volts each so the six cells > in a Car Battery gives 13.2Volts. > The voltage of a lead acid cell varies between 1.93 volts when flat and 2.11 volts when fully charged. It can rise to 2.33 volts while on charge. This translates to the voltage at the lighter socket being anywhere between 11.8 and 14.4 Volts. When the engine is running, it normally will be about 14.4 volts. 13.2 volts is a safe voltage to hold the battery at while on float charge. (The battery is being used as a backup supply in case of mains failure.) > When recharging a Battery, you want to apply a slightly higher Voltage > ... (as the Battery will pull the charger Voltage down) so 13.4Volts up > to about 14Volts would probably do the job well enough, although > charging the Battery may take a while longer. > > 15Volts might cook the Battery. On occasion, 15 Volt or slightly more can be used ro equalise the charge between the cells, but this will cause some of the water in the electrolyte to split into hydrogen and oxygen. -- Tciao for Now! John.
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| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2026-10-03 13:09 +0100 |
| Message-ID | <119qr92$2vglb$2@dont-email.me> |
| In reply to | #70696 |
On 03/10/2026 12:50, John Williamson wrote: > On occasion, 15 Volt or slightly more can be used ro equalise the charge > between the cells, but this will cause some of the water in the > electrolyte to split into hydrogen and oxygen. And some of the cells to split into plastic, lead, acid and a loud bang DAMHIKT... -- “The urge to save humanity is almost always only a false face for the urge to rule it.” – H. L. Mencken
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| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-03 15:59 +0100 |
| Message-ID | <nicjicFn3jhU1@mid.individual.net> |
| In reply to | #70697 |
On 03/10/2026 13:09, The Natural Philosopher wrote: > On 03/10/2026 12:50, John Williamson wrote: >> On occasion, 15 Volt or slightly more can be used ro equalise the >> charge between the cells, but this will cause some of the water in the >> electrolyte to split into hydrogen and oxygen. > And some of the cells to split into plastic, lead, acid and a loud bang > DAMHIKT... That needs a spark nearby -- Tciao for Now! John.
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| From | Jan Panteltje <alien@comet.invalid> |
|---|---|
| Date | 2026-10-03 15:56 +0000 |
| Message-ID | <119r8k4$3515t$1@dont-email.me> |
| In reply to | #70699 |
>John Williamson <johnwilliamson@btinternet.com>wrote: >>On 03/10/2026 13:09, The Natural Philosopher wrote: >> On 03/10/2026 12:50, John Williamson wrote: >>> On occasion, 15 Volt or slightly more can be used ro equalise the >>> charge between the cells, but this will cause some of the water in the >>> electrolyte to split into hydrogen and oxygen. >> And some of the cells to split into plastic, lead, acid and a loud bang >> DAMHIKT... > >That needs a spark nearby I was just charging a lead acid battery (from a UPS) with my lab supply: https://ibb.co/j9hGGcNB You can set voltage and current-limit anyway you want Very useful thing, designed and build it around 2010: https://panteltje.nl/panteltje/pic/pwr_pic/ You can charge all sort of batteries with it. 12 V in from a big wallwart (from mains) 0 to 24 V adjustable output.
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| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-03 17:19 +0100 |
| Message-ID | <nico85FnpicU1@mid.individual.net> |
| In reply to | #70700 |
On 03/10/2026 16:56, Jan Panteltje wrote: >> John Williamson <johnwilliamson@btinternet.com>wrote: >>> On 03/10/2026 13:09, The Natural Philosopher wrote: >>> On 03/10/2026 12:50, John Williamson wrote: >>>> On occasion, 15 Volt or slightly more can be used ro equalise the >>>> charge between the cells, but this will cause some of the water in the >>>> electrolyte to split into hydrogen and oxygen. >>> And some of the cells to split into plastic, lead, acid and a loud bang >>> DAMHIKT... >> >> That needs a spark nearby > > I was just charging a lead acid battery (from a UPS) with my lab supply: > https://ibb.co/j9hGGcNB > > You can set voltage and current-limit anyway you want > > Very useful thing, designed and build it around 2010: > https://panteltje.nl/panteltje/pic/pwr_pic/ > > You can charge all sort of batteries with it. > 12 V in from a big wallwart (from mains) 0 to 24 V adjustable output. > I use 12 volts at home to power all sorts of things, and for many years, I used lead acid batteries. I now use Lithium Iron Phosphate batteries. (I live on a boat) The batteries get changed by solar power, the engine alternator or a mains powered charger. I have a number of DC-DC converters to power laptops and such and an inverter which can power a microwave or power tools. -- Tciao for Now! John.
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| From | Jan Panteltje <alien@comet.invalid> |
|---|---|
| Date | 2026-10-04 10:54 +0000 |
| Message-ID | <119tba1$3quvc$1@dont-email.me> |
| In reply to | #70701 |
>John Williamson <johnwilliamson@btinternet.com>wrote: >>On 03/10/2026 16:56, Jan Panteltje wrote: >>> John Williamson <johnwilliamson@btinternet.com>wrote: >>>> On 03/10/2026 13:09, The Natural Philosopher wrote: >>>> On 03/10/2026 12:50, John Williamson wrote: >>>>> On occasion, 15 Volt or slightly more can be used ro equalise the >>>>> charge between the cells, but this will cause some of the water in the >>>>> electrolyte to split into hydrogen and oxygen. >>>> And some of the cells to split into plastic, lead, acid and a loud bang >>>> DAMHIKT... >>> >>> That needs a spark nearby >> >> I was just charging a lead acid battery (from a UPS) with my lab supply: >> https://ibb.co/j9hGGcNB >> >> You can set voltage and current-limit anyway you want >> >> Very useful thing, designed and build it around 2010: >> https://panteltje.nl/panteltje/pic/pwr_pic/ >> >> You can charge all sort of batteries with it. >> 12 V in from a big wallwart (from mains) 0 to 24 V adjustable output. >> >I use 12 volts at home to power all sorts of things, and for many years, >I used lead acid batteries. I now use Lithium Iron Phosphate batteries. >(I live on a boat) The batteries get changed by solar power, the engine >alternator or a mains powered charger. I have a number of DC-DC >converters to power laptops and such and an inverter which can power a >microwave or power tools. I have these for on a boat: 250_Ah_12V_to_230V_sinewave_IXXIMG_0796.JPG Now in use as backup for my computers, as the UPS battery gave up after constantly coming in since the power company changed their meter for a 'smart' one and removed the connection of neutral to local ground, causing a voltage drop. So much for improvement, now you pay more for their cable losses?? That battery pack runs microwave and fridge too if needed I have 3 large flexible solar panels for on a boat. And a small fixed 80 W one upstair in a window. Several solar powered flashights too, some with hand crank.
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| From | c186282 <c186282@nnada.net> |
|---|---|
| Date | 2026-10-05 01:27 -0400 |
| Message-ID | <cpWdnegfD_vRqF73nZ2dnZfqn_udnZ2d@giganews.com> |
| In reply to | #70712 |
On 10/4/26 06:54, Jan Panteltje wrote: >> John Williamson <johnwilliamson@btinternet.com>wrote: >>> On 03/10/2026 16:56, Jan Panteltje wrote: >>>> John Williamson <johnwilliamson@btinternet.com>wrote: >>>>> On 03/10/2026 13:09, The Natural Philosopher wrote: >>>>> On 03/10/2026 12:50, John Williamson wrote: >>>>>> On occasion, 15 Volt or slightly more can be used ro equalise the >>>>>> charge between the cells, but this will cause some of the water in the >>>>>> electrolyte to split into hydrogen and oxygen. >>>>> And some of the cells to split into plastic, lead, acid and a loud bang >>>>> DAMHIKT... >>>> >>>> That needs a spark nearby >>> >>> I was just charging a lead acid battery (from a UPS) with my lab supply: >>> https://ibb.co/j9hGGcNB >>> >>> You can set voltage and current-limit anyway you want >>> >>> Very useful thing, designed and build it around 2010: >>> https://panteltje.nl/panteltje/pic/pwr_pic/ >>> >>> You can charge all sort of batteries with it. >>> 12 V in from a big wallwart (from mains) 0 to 24 V adjustable output. >>> >> I use 12 volts at home to power all sorts of things, and for many years, >> I used lead acid batteries. I now use Lithium Iron Phosphate batteries. >> (I live on a boat) The batteries get changed by solar power, the engine >> alternator or a mains powered charger. I have a number of DC-DC >> converters to power laptops and such and an inverter which can power a >> microwave or power tools. > > > I have these for on a boat: > 250_Ah_12V_to_230V_sinewave_IXXIMG_0796.JPG > > Now in use as backup for my computers, as the UPS battery gave up after > constantly coming in since the power company changed their meter for a 'smart' > one and removed the connection of neutral to local ground, > causing a voltage drop. > So much for improvement, now you pay more for their cable losses?? > > That battery pack runs microwave and fridge too if needed > I have 3 large flexible solar panels for on a boat. > And a small fixed 80 W one upstair in a window. > Several solar powered flashights too, some with hand crank. LIPo batts CAN still explode for no obvious reason. Got a scar to prove it. Future/NOW ... look into sodium batteries. Plenty on Amazon. Almost as good as LIPo bur DON'T blow up in your face and set everything on fire. Seems the usual charge circuits for lead-acid work fine for sodium, though sodium CAN be charged faster. AM looking to make a semi-decent DC power storage unit - probably solar charged. Doesn't have to be huge, maybe ten or fifteen thousand kva, above the 'consumer' UPS units. A 120vac take-off is required of course, but want 12vdc too. NOT an 'off-grid solution' ... just a 'fill-in'. But, DO want the sodium batteries. Fair, stackable, commercial units : https://xpcc.com/xtreme-power-sodium-ups/ Also informative : https://www.kmdpower.com/news/how-to-choose-the-right-sodium-ion-battery-for-ups-system/
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| From | Jan Panteltje <alien@comet.invalid> |
|---|---|
| Date | 2026-10-05 07:55 +0000 |
| Message-ID | <119vl5u$ne7p$1@dont-email.me> |
| In reply to | #70719 |
>c186282 <c186282@nnada.net>wrote: >>On 10/4/26 06:54, Jan Panteltje wrote: >>> John Williamson <johnwilliamson@btinternet.com>wrote: >>>> On 03/10/2026 16:56, Jan Panteltje wrote: >>>>> John Williamson <johnwilliamson@btinternet.com>wrote: >>>>>> On 03/10/2026 13:09, The Natural Philosopher wrote: >>>>>> On 03/10/2026 12:50, John Williamson wrote: >>>>>>> On occasion, 15 Volt or slightly more can be used ro equalise the >>>>>>> charge between the cells, but this will cause some of the water in the >>>>>>> electrolyte to split into hydrogen and oxygen. >>>>>> And some of the cells to split into plastic, lead, acid and a loud bang >>>>>> DAMHIKT... >>>>> >>>>> That needs a spark nearby >>>> >>>> I was just charging a lead acid battery (from a UPS) with my lab supply: >>>> https://ibb.co/j9hGGcNB >>>> >>>> You can set voltage and current-limit anyway you want >>>> >>>> Very useful thing, designed and build it around 2010: >>>> https://panteltje.nl/panteltje/pic/pwr_pic/ >>>> >>>> You can charge all sort of batteries with it. >>>> 12 V in from a big wallwart (from mains) 0 to 24 V adjustable output. >>>> >>> I use 12 volts at home to power all sorts of things, and for many years, >>> I used lead acid batteries. I now use Lithium Iron Phosphate batteries. >>> (I live on a boat) The batteries get changed by solar power, the engine >>> alternator or a mains powered charger. I have a number of DC-DC >>> converters to power laptops and such and an inverter which can power a >>> microwave or power tools. >> >> >> I have these for on a boat: >> 250_Ah_12V_to_230V_sinewave_IXXIMG_0796.JPG >> >> Now in use as backup for my computers, as the UPS battery gave up after >> constantly coming in since the power company changed their meter for a 'smart' >> one and removed the connection of neutral to local ground, >> causing a voltage drop. >> So much for improvement, now you pay more for their cable losses?? >> >> That battery pack runs microwave and fridge too if needed >> I have 3 large flexible solar panels for on a boat. >> And a small fixed 80 W one upstair in a window. >> Several solar powered flashights too, some with hand crank. > > > LIPo batts CAN still explode for no obvious > reason. Got a scar to prove it. > > Future/NOW ... look into sodium batteries. Plenty > on Amazon. Almost as good as LIPo bur DON'T blow > up in your face and set everything on fire. Seems > the usual charge circuits for lead-acid work fine > for sodium, though sodium CAN be charged faster. > > AM looking to make a semi-decent DC power storage > unit - probably solar charged. Doesn't have to be > huge, maybe ten or fifteen thousand kva, above the > 'consumer' UPS units. A 120vac take-off is required > of course, but want 12vdc too. NOT an 'off-grid > solution' ... just a 'fill-in'. But, DO want the > sodium batteries. > > Fair, stackable, commercial units : > > https://xpcc.com/xtreme-power-sodium-ups/ > > Also informative : > > >https://www.kmdpower.com/news/how-to-choose-the-right-sodium-ion-battery-for-ups-system/ Nice link, thank you I did read a bit about sodium batteriies for electric cars. I will look around a bit for some big ones. The lead-acid one in my APC UPS is now, after several years, as good as dead just tried a charge - recharge cycle, not much battery capacity left. A new battery for it is about 20 Euro / 20 US dollars. I can get a new UPS with battery from about 100 Euro / dollars here: https://www.alternate.nl/UPS Was already thinking about a design, maybe sodium is an option..
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| From | "Carlos E. R." <robin_listas@es.invalid> |
|---|---|
| Date | 2026-10-05 14:54 +0200 |
| Message-ID | <nihkvhFfekcU2@mid.individual.net> |
| In reply to | #70720 |
On 2026-10-05 09:55, Jan Panteltje wrote:
> I can get a new UPS with battery from about 100 Euro / dollars here:
> https://www.alternate.nl/UPS
Alternate was a good shop in Spain, over a decade ago; I bought many
things from them. Now they are useless, no shop here, long delivery
times, and garbage web page.
--
Cheers,
Carlos E.R.
ES🇪🇸, EU🇪🇺.
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| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-05 11:29 +0100 |
| Message-ID | <nihcgmFekvoU1@mid.individual.net> |
| In reply to | #70719 |
On 05/10/2026 06:27, c186282 wrote: > On 10/4/26 06:54, Jan Panteltje wrote: >> I have these for on a boat: >> 250_Ah_12V_to_230V_sinewave_IXXIMG_0796.JPG >> >> Now in use as backup for my computers, as the UPS battery gave up after >> constantly coming in since the power company changed their meter for a >> 'smart' >> one and removed the connection of neutral to local ground, >> causing a voltage drop. >> So much for improvement, now you pay more for their cable losses?? >> >> That battery pack runs microwave and fridge too if needed >> I have 3 large flexible solar panels for on a boat. >> And a small fixed 80 W one upstair in a window. >> Several solar powered flashights too, some with hand crank. > > > LIPo batts CAN still explode for no obvious > reason. Got a scar to prove it. > Lithium Polymer batteries are, as you say, prone to thermal runaway if overcharged, run too flat or the day has a "y" in it. They are currently used in phones, laptops, tablets, e-bikes and some cars. LiFePO4 batteries, on the other hand are currently being used in many thousands of boats as power supplies for the domestic stuff, and I have yet to hear one report of an explosion or fire that was not started by ancillary equipment. The cells are usually still intact after the fire. You *can*, if you are determined enough, make the cells ignite by, say, repeatedly using an ice pick to puncture them, but it needs to be a metal pick, so that it shorts out the internal structures and even then, as long as you stand upwind, the fumes won't hurt you. > Future/NOW ... look into sodium batteries. Plenty > on Amazon. Almost as good as LIPo bur DON'T blow > up in your face and set everything on fire. Seems > the usual charge circuits for lead-acid work fine > for sodium, though sodium CAN be charged faster. > I just searched for "sodium battery" on Amazon UK. Not a single one in the resuktys, but I *was* offered lead acid of various types, as well as a number of Lithium based batteries of various tyoes. Do you have a link for a sodium battery on Amazon? The problem is that the cell voltages need clever electronics to use them with normal equipment, as it varies between 3.1 and 1.5 volts per cell in normal use. The energy density is not much more than half that of Lithium based batteries. > AM looking to make a semi-decent DC power storage > unit - probably solar charged. Doesn't have to be > huge, maybe ten or fifteen thousand kva, above the > 'consumer' UPS units. A 120vac take-off is required > of course, but want 12vdc too. NOT an 'off-grid > solution' ... just a 'fill-in'. But, DO want the > sodium batteries. > You want ten to 15 megawatt hours and you call it "small"? :-0 That is well into pumped electrolyte utility company territory. (I have about 4kVA on the boat, and that lasts me a couple of days, as long as I don't use the immersion heater.) > Fair, stackable, commercial units : > > https://xpcc.com/xtreme-power-sodium-ups/ > I'd want rather more run time than they offer. At full power, you don't even get enough time to log off.... -- Tciao for Now! John.
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