Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: John Williamson Newsgroups: alt.comp.os.windows-11,alt.comp.os.windows-10,comp.os.linux.advocacy,comp.os.linux.misc,uk.tech.broadcast Subject: Re: OT - TV Date: Mon, 5 Oct 2026 11:29:42 +0100 Lines: 83 Message-ID: References: <118cshs$2v7m0$1@dont-email.me> <11987r4$dcgn$1@dont-email.me> <11991m3$mv9t$1@dont-email.me> <119as35$18kn0$1@dont-email.me> <119bbo8$1e3hu$1@dont-email.me> <119is9d$68cr$1@dont-email.me> <119j2qg$8pgq$1@dont-email.me> <119m338.o7c.1@ID-201911.user.individual.net> <119qnr6$2urls$1@dont-email.me> <119qr92$2vglb$2@dont-email.me> <119r8k4$3515t$1@dont-email.me> <119tba1$3quvc$1@dont-email.me> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: individual.net 4vkq4Ak7TornP7+UPUOMgwM2XCmAp3Z1RR9tahjqJWgxgB2J98 Cancel-Lock: sha1:HFxbNfLiK9VWTmONHGVs0J/G9bE= sha256:H4Kd3/JSh5bBUtSN04sLN8y8CaZXZieOiyN1bp3SkZs= User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Thunderbird/50.0 In-Reply-To: Content-Language: en-GB Xref: csiph.com alt.comp.os.windows-11:35771 alt.comp.os.windows-10:196619 comp.os.linux.advocacy:723288 comp.os.linux.misc:92928 uk.tech.broadcast:70721 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.