[RE-wrenches] offgrid system question

[Darryl Thayer]

I use for a short cut 1 AC ton is 1 HP mechanical or 1kW electrical.

So If I have a 3 ton heat pump I figure the compressor is about a 1 horse power motor and about 1 kW running load.  If that is 240 volts that is about 4 0r 5 amps. Because I have had some starting problems, I say that the running amps times 10 are the start amps, so this unit should have inverter capable of starting 40 amps Surge.    If the SEER is higher than 12 it will start comiing down, but I do not know for inverter sizing  

If you are doing and energy anaylsis you would want better numbers from your AC manufacturer. 

The 9000 watts for 2.5 tons is to high.  
Darryl

--- On Fri, 8/22/08, jay peltz <jay at asis.com> wrote:

> From: jay peltz <jay at asis.com>
> Subject: Re: [RE-wrenches] offgrid system question
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Friday, August 22, 2008, 9:23 AM
> Can someone tell me how to convert AC "tons" to
> rough electrical load?
> or is there a way?
> 
> I've got a customer who is wanting to install a AC unit
> and they tell  
> me its a 2.5 ton and uses 9000 watts.
> ( they haven't given me make or model yet)
> 
> thanks,
> jay
> 
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