1.) The inverter efficiencies are estimates, not gospel. Mine runs about .97 or so most of the time. Spec sheet sez. .955 or so.
2.) Back of envelope stuff : A 6 kW system under good conditions in Ventura co. will probably produce about 10,000 to 10,500 kWhrs./yr. The 1.5% diff. (.965-.95 = .015) in eff. as claimed amounts to ~~ (10,500 X .015) = 158 kWhrs./yr. = 13 kWhrs./month. At say, $.37/kWhr. = (13 X $37) = $4.86/mo. TOPS !
3.) I neither approve or disapprove. I would suggest your project mgr. may need to get a bit tighter in the estimating area.
2.) Back of envelope stuff : A 6 kW system under good conditions in Ventura co. will probably produce about 10,000 to 10,500 kWhrs./yr. The 1.5% diff. (.965-.95 = .015) in eff. as claimed amounts to ~~ (10,500 X .015) = 158 kWhrs./yr. = 13 kWhrs./month. At say, $.37/kWhr. = (13 X $37) = $4.86/mo. TOPS !
3.) I neither approve or disapprove. I would suggest your project mgr. may need to get a bit tighter in the estimating area.
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