[ausev] A/C in an EV - battery recommendations?

[Claire Sorenson]

I just bought a Jet - Ford Courier truck that needs 20 6V batteries.  Which
Lead Acids are working best for ya'll?  I saw one EV website that
recommended US 125, 6V flooded Lead Acid golf car batteries that give a good
range with reasonable price.  The other links on our EV website didn't
appear to mention much about batteries.  I'm not looking for a long
discussion of  battery theory as much as short list of what people are
successfully using now and where you purchased them, especially if there are
some good local sources.  I would like to have at least the range and m.p.h.
that my Jet - Ford Escort is getting: 45 range, 50 m.p.h.  Thanks

-----Original Message-----
From: ausev-bounces at austinev.org [mailto:ausev-bounces at austinev.org] On
Behalf Of Sarah & Erik
Sent: Tuesday, June 12, 2007 11:24 PM
To: AustinEV News Announcements and General Discussion
Subject: Re: [ausev] A/C in an EV

For scale, it takes about 50 amps at 128V to keep my car going 40 mph ( I
think it's actually a little less, but it's never flat enough around here to
actually find out!)

50A * 120V =6kW =~ 8 hp (120V is accounting for some battery sag)

That's battery power, it's probably about 6 hp that's actually making it to
the road after the controller and the transmission losses.

My understanding is car AC is they are somewhere between 3000-10000 Btu/h,
which is 1.2-4 hp. It's does take a healthy amount of juice to run AC. BUT
apparently it also takes less AC to cool your car once converted because you
no longer have an engine dumping a huge amount of heat in front of your car.

Erik

On 6/12/07, TERRY KING <tntking at sbcglobal.net> wrote:
> I don't have exact figures in my head regarding how much horsepower is 
> used to run an R-134 air conditioning compressor off an ICE, but I 
> think it would surprise us all. I'm thinking at least 10 to15 HP to 
> run one. Another alternative that just popped into my head is those 12 
> volt coolers that are plugged into the cigarette lighter. I don't 
> remember the principle on which they work, and I haven't ever owned 
> one to see how much capacity they have but they might be adaptable.
>
> Brian Lasseter <blasseter.cmpe01 at gtalumni.org> wrote:
> On 6/11/07, TERRY KING wrote:
> > I'm laying the groundwork toward converting a Geo Metro to battery
> electric
> > and I plan to have air conditioning. I live in No.Texas which is no 
> > place
> to
> > live without it; but it won't be based on refrigerant. I plan to 
> > circulate chilled water through my existing evaporator using an ordinary
ice cooler.
> I
> > may even try an ice & salt combination but that might be actually 
> > too corrosive for my aluminum evaporator. I've located on Ebay RV 
> > water pumps which move .7 to 2.8 gallons per minute and draw around 4
amps @ 12 volts.
> I
> > figure the ice will melt to ambient temperture just about the time 
> > my battery pack is due a recharge. I'll keep you posted
>
> While a realize a question of motives might be a bit of a stretch for 
> this list, I am kind of curious for a brief take on why you do not 
> plan on using refrigerant.
>
> I live in TX too, and I sure as heck plan on having A/C in my car, but 
> in my car, the plan is to just use the refrigerant that is already in 
> the car, and just hook an electric motor to run the compressor. (Even 
> if I didn't use the refrigerant, I would still have to dispose of it.) 
> This method is less efficient, but it is cheaper and easier.
>
>
> --
> TTFN,
> Brian "Lasso" Lasseter
>
> . (512)736-1677 . AIM:digininja . ICQ:2238123 . MSN:azoreg . "No Sane 
> man will dance." -Cicero (106-43 B.C.)
>
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