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 [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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 _______________________________________________ List sponsored by Home Power magazine [email protected] http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org _______________________________________________ List sponsored by Home Power magazine [email protected] http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
