[ausev] A/C in an EV

[Sarah & Erik]

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 ·
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>
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