[RE-wrenches] offgrid system question

[Travis Creswell]

1 ton = 12,000 BTU's

SEER = how many BTU's per kW (Since you asked about "rough electrical load"
for this equation we're going to ignore the complexities for EER vs. SEER,
COP at varying outdoor temps and so on.  We'll leave that for someone else
to discuss if they desire)

Plus you'll want to add approximately 150 watts per ton for the air handler

Assuming a 13 SEER AC unit the math is;

2.5 tons x 12,000 BTU's = 30,000 BTU's

30,000 BTU's/13 SEER= 2.3 kW

2.5 tons x 150 watts/ton for air handling = 375 watts

For a total running kW of ~2.7.

That's how I do it.  Doesn't mean it's the right or only way.

Best,
Travis Creswell
Ozark Energy Services



-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of jay peltz
Sent: Friday, August 22, 2008 9:23 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] offgrid system question

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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