[RE-wrenches] offgrid system question

[jay peltz]

Hi Peter and others,

This has been super helpful.

My customer's electrical designer has calculated the AC units 2.5 ton  
at 9.5Kw.

so this really helps me to be able to go to him armed with good data.

thanks again,

jay

peltz power
On Aug 22, 2008, at 8:29 AM, Peter Parrish wrote:

> There are two figures of merit that can be used to make the  
> conversion. The
> simplist is EER.
>
> First, how many "tons" the AC is rated at? Multiply that number by  
> 12,000
> BTU/hr per ton, to get the number of BTU/hr the AC system can pump  
> out of
> the house.
>
> Second, EER is the ration of the BTU/hr to electrical power the AC  
> consumes.
> Divide the BTU/hr by EER and you get the power consumption.
>
> There is a second figure of merit called SEER, it is similar to EER  
> but
> takes a seasonal average. All ACs have a SEER rating.
>
> Example: 3 ton AC rated at a SEER of 10. 3 ton equals 36,000 BTU/hr  
> and
> consumes 3.6 kW (15 A at 240 VAC). If you run the AC for four hours  
> a day,
> the energy consumed is14.4 kWh.
>
> - Peter
>
> Peter T. Parrish, Ph.D., President
> California Solar Engineering, Inc.
> 820 Cynthia Ave., Los Angeles, CA 90065
> Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
> CA Lic. 854779, NABCEP Cert. 031806-26
> peter.parrish at calsolareng.com
>
> -----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 7:23 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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