Groups > sci.electronics.design > #460431

Re: What maximum power inverter for car?

From	Don Y <blockedofcourse@foo.invalid>
Newsgroups	sci.electronics.design
Subject	Re: What maximum power inverter for car?
Date	2017-05-15 14:09 -0700
Organization	A noiseless patient Spider
Message-ID	<ofd57e$pug$1@dont-email.me> (permalink)
References	<b2e24c21-5934-4111-ac97-2ef1d4df4aca@googlegroups.com>

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On 5/15/2017 8:14 AM, edward.ming.lee@gmail.com wrote:
> Looking into high power inverter to run off the car.  But for 1000W, it's
> likely draining 80A or 90A from the alternator.  Does that mean the battery
> will die even when the engine is running?

If you run it long enough, the surplus power will, of course, come from
the battery -- until the battery is unable to keep the engine running!

You may find that you cook the diode trio in the alternator before
that point -- alternators aren't intended to run at 100% duty cycle.

Also, consider how you're going to get that power *from* the battery
terminals to your load.  If you're stuck with a 12V supply, you'll
want to keep those cables very short to avoid large IR losses.

If your need is only temporary, consider tossing a spare battery
in the trunk with a *light* feed from the engine (behind a diode)
to pick up part of the load.  Then, when THAT battery runs flat,
you can still drive home.

(Trunk is a better location for a battery, regardless.  Under the hood
is just a matter of convenience -- and shorter wire run to starter)

> I believe most alternators are around 50A, so max power of 600W?

Depends on the alternator and vehicle.  My buddy's truck has a *pair*
of 150A alternators and a pair of oversized batteries (for the 7L diesel)

Are you sure you really *need* 1000W?  Just because the thing
you are powering CLAIMS to be rated at 1000W doesn't mean it will actually
DRAW that!

Thread

What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-15 08:14 -0700
  Re: What maximum power inverter for car? "Carl Ijames" <carl.ijamesDDD@EEEverizon.net> - 2017-05-15 12:29 -0400
    Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-15 10:02 -0700
      Re: What maximum power inverter for car? Tim Wescott <seemywebsite@myfooter.really> - 2017-05-15 12:43 -0500
      Re: What maximum power inverter for car? bloggs.fredbloggs.fred@gmail.com - 2017-05-15 10:59 -0700
      Re: What maximum power inverter for car? "Carl Ijames" <carl.ijamesDDD@EEEverizon.net> - 2017-05-15 14:18 -0400
    Re: What maximum power inverter for car? oldschool@tubes.com - 2017-05-15 14:01 -0400
      Re: What maximum power inverter for car? Don Y <blockedofcourse@foo.invalid> - 2017-05-15 14:14 -0700
  Re: What maximum power inverter for car? tabbypurr@gmail.com - 2017-05-15 10:38 -0700
    Re: What maximum power inverter for car? Tim Wescott <seemywebsite@myfooter.really> - 2017-05-15 13:10 -0500
      Re: What maximum power inverter for car? tabbypurr@gmail.com - 2017-05-15 12:56 -0700
  Re: What maximum power inverter for car? Jon Elson <jmelson@wustl.edu> - 2017-05-15 13:53 -0500
    Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-15 13:00 -0700
      Re: What maximum power inverter for car? "Carl Ijames" <carl.ijamesDDD@EEEverizon.net> - 2017-05-15 17:09 -0400
      Re: What maximum power inverter for car? Don Y <blockedofcourse@foo.invalid> - 2017-05-15 14:15 -0700
        Re: What maximum power inverter for car? mike <ham789@netzero.net> - 2017-05-15 17:34 -0700
          Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-15 17:41 -0700
            Re: What maximum power inverter for car? Don Y <blockedofcourse@foo.invalid> - 2017-05-15 18:14 -0700
              Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-15 19:34 -0700
          Re: What maximum power inverter for car? Don Y <blockedofcourse@foo.invalid> - 2017-05-15 18:10 -0700
      Re: What maximum power inverter for car? Jon Elson <jmelson@wustl.edu> - 2017-05-15 16:28 -0500
      Re: What maximum power inverter for car? tabbypurr@gmail.com - 2017-05-15 15:43 -0700
        Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-15 17:44 -0700
          Re: What maximum power inverter for car? tabbypurr@gmail.com - 2017-05-15 17:59 -0700
            Re: What maximum power inverter for car? Chris Jones <lugnut808@spam.yahoo.com> - 2017-05-16 21:40 +1000
              Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-16 08:03 -0700
                Re: What maximum power inverter for car? tabbypurr@gmail.com - 2017-05-16 09:08 -0700
                Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-16 09:19 -0700
                Re: What maximum power inverter for car? tabbypurr@gmail.com - 2017-05-16 09:36 -0700
                Re: What maximum power inverter for car? Jon Elson <jmelson@wustl.edu> - 2017-05-16 13:34 -0500
                Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-16 12:52 -0700
                Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-16 13:27 -0700
                Re: What maximum power inverter for car? Ralph Barone <ralph@invalid.com> - 2017-05-17 02:26 +0000
                Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-16 21:50 -0700
                Re: What maximum power inverter for car? "Carl Ijames" <carl.ijamesDDD@EEEverizon.net> - 2017-05-17 10:46 -0400
                Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-17 22:31 -0700
                Re: What maximum power inverter for car? "Carl Ijames" <carl.ijamesDDD@EEEverizon.net> - 2017-05-18 10:26 -0400
                Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-18 08:23 -0700
                Re: What maximum power inverter for car? Jon Elson <jmelson@wustl.edu> - 2017-05-17 13:59 -0500
                Re: What maximum power inverter for car? Ralph Barone <ralph@invalid.com> - 2017-05-18 01:02 +0000
                Re: What maximum power inverter for car? "Carl Ijames" <carl.ijamesDDD@EEEverizon.net> - 2017-05-16 15:34 -0400
                Re: What maximum power inverter for car? mike <ham789@netzero.net> - 2017-05-16 15:48 -0700
                Re: What maximum power inverter for car? Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-05-16 13:05 -0400
                Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-16 11:12 -0700
      Re: What maximum power inverter for car? Jasen Betts <jasen@xnet.co.nz> - 2017-05-23 07:02 +0000
        Re: What maximum power inverter for car? edward.ming.lee@gmail.com - 2017-05-23 07:29 -0700
  Re: What maximum power inverter for car? Don Y <blockedofcourse@foo.invalid> - 2017-05-15 14:09 -0700
  Re: What maximum power inverter for car? Jasen Betts <jasen@xnet.co.nz> - 2017-05-23 06:43 +0000
    Re: What maximum power inverter for car? Neon John <no@never.com> - 2017-05-27 12:49 -0400

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