Phil,
Yes, I screwed up. I know that Golf Cart batteries are 6 volt, but used
12 volts in my quicky calculations.
It's not of a lot of consequence, as Bill isn't going to run his A/C on
battery power very long in either event. Time for a small generator....
<<Jim>>
Philip Piper wrote:
>
> Bill, my cart batteries are 6 volt, that is common on.
>
> Phil Piper
>
> ----Original Message Follows----
> From: Jim Dunmyer <[EMAIL PROTECTED]>
> Reply-To: [EMAIL PROTECTED]
> To: [EMAIL PROTECTED]
> Subject: Re: [VAC] Air Cond for Dreamers
> Date: Sat, 05 Aug 2000 10:43:53 -0400
>
> Bill,
> That's actually pretty easy to calculate:
>
> Your A/C will draw about 9 amps, if I'm guessing correctly. That's at
> 120 VAC, so you'll be looking at 90 amps from the 12 volt battery bank.
> Add in a bit of inefficiency from the inverter, and let's round it off
> to 100 amps.
>
> You want to run the A/C for 8 hours, that's 800 AH total. As you
> shouldn't draw your batteries down more than 50%, you'll need at least
> 1600 AH of batteries. Golf cart batteries are approximately 200 AH, so
> you need 8 of them. You'd better figure on several more, "just in case".
>
> Your trickle charger and solar panels will supply 240 AH (charger at
> 24/7) plus about 30 AH from the panels. That's 270 AH against a load of
> 800 AH. I think the operative expression is "Pissing in the wind".
>
> Eight golf cart batteries will weigh about 500#, maybe more. They'll run
> your A/C for 2 or maybe 3 days before being pretty flat.
>
> That's if all my calculations are correct, it 'seems to me' that I'm
> missing something and I'm off by a factor of 100% or so. IE: 16 golf
> cart batteries would be more like it.
>
> Speaking of solar power: Has anyone noticed that the Diesel road signs
> are pretty much 'gone', having been replaced by solar-powered outfits?
> Those signs have 300 watts of panels and SIXTEEN golf cart batteries.
> The lights themselves are LEDs, not incandescent bulbs. That much solar
> power can give maybe 100 AH or a bit more on a sunny day. All of those
> batteries are to keep the thing going during a cloudy spell.
>
> <<Jim>>
>
> Bill Scott wrote:
> >
> > This is a design question for all you boondockers that would like to
> > have A/C without a noisy generator, or adequate 110 volt power. Anyone
> > with the savy can try to answer the question, and there might be a prize
> > for the winner. I fully expect Jim Dunmyer to have a competitive
> > design. Question:
> >
> > How many large golf cart type storage batteries will it require to run a
> > 9,000 btu Air conditioner, supplemented by a small trickle charger from
> > a low 110 volt source, putting into the batteries 10 amps of DC. The
> > batteries will also have a charging source of 2, 48 watt solar panels.
> > All of this DC current will then be fed into a 2500 watt invertor, to
> > provide the power to run the A/C. The Air Conditioner will only run
> > during the day, from 10am, until 6pm, a period when the solar panels
> > will be producing maximum out put. Ready, get
> > set,................................go.
> >
> > Bill Scott
> > 61 Bambi, VAC & WBCCI #3221
> > 1VP & Membership Chairman , WDCU
> > http://www.servintfree.net/wbcci-dc/
>
> --
>
> <<http://www.oldengine.org/members/jdunmyer>>
> <<[EMAIL PROTECTED]>>
> <<lower SE Michigan, USA>>
> <<mailto:[EMAIL PROTECTED]>>
>
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