How do I design a solar system that will run my central a/c ?
Michele | RENVU: Hi there, thanks for visiting RENVU. I can definitely help you with that. Do you know how much power your AC takes?
Visitor: Hi Michele, I only know its a Trane 4 ton 13 seer.
Michele | RENVU: Ah it will be easiest to just base it on past electric bills if you have them. But eitherway the easiest way to create this system will be on our solar kit guide. Have you tried the Solar Kit Guide?
Visitor: the breaker box has 240 volt 60 amp single phase
Michele | RENVU: That is good info. 240V x 60a =14kW!!
Then times that (14kW) by how many hours the AC runs for a day to get kWhrs. If the AC runs for 3 hours a day you'll get (14kW x 3hrs)= 42kWhrs.
Then find out how many hours of sunlight you get in your area. http://www.bigfrogmountain.com/SunHoursPerDay.html As an example in Fairbanks AK they get 3.99 sunhours.
Divided the kWhrs by the hours of available sunlight this results in the kW's of solar needed. So 42kWhrs/3.99hrs=10.5kW. So 10.5kW is the size of the PV system needed to power the AC.
Then input that into the Solar Kit guide and Boom! You can specify your # of modules by dividing the system size by the module rated Wattage. If you want to use the ALEO S59 310W, Mono, Black Frame, (10500W/310W)=33.8 modules --> this rounds to 34 modules!
Please let me know if that was helpful or if you need anything else?
Visitor: wow I gotta print this and go get my electric bills etc. catch you in a bit - if I can't figure it
Michele | RENVU: Ok I believe in you! But we will be here if you
have any questions its easy to get mixed up on the different kW's invovled!
Visitor : I agree. but you reminded me that some answers are right on electric bills thank u