[RE-wrenches] 3 Phase With 2 Inverters?

We were asked to inspect a GT system installed by others. Service is 208 3ph with two (?) Fronius IG 4500 208v inverters. The inverter panel is 3ph with two 2pole breakers - one each side of the buss bar in a A/B, B/C configuration (??). Called Fronius and they said it would work, but they

Re: [RE-wrenches] 3 Phase With 2 Inverters?

Hi Holt, We installed a commercial system a year ago for the National Park Service that was designed by a competitor (?) and signed off on by an engineer. It consisted of 13.2 kw of pv and two Fronius 7000 watt, 208 3 ph. inverters. It sounds a lot like what you are dealing with. I questioned

Re: [RE-wrenches] 3 Phase With 2 Inverters?

Hi holt, Just FYI, Fronius will pay you $250 each to swap the inverters. Larry Crutcher Starlight Solar Power Systems On Nov 27, 2012, at 12:59 PM, hol...@sbcglobal.net hol...@sbcglobal.net wrote: We were asked to inspect a GT system installed by others. Service is 208 3ph with two (?)

Re: [RE-wrenches] 3 Phase With 2 Inverters?

I would agree that the imbalance at these power levels is not a major issue. If it appears that Phase A is most heavily-loaded, I'd install the inverters as A-B and A-C to help mitigate the existing imbalance. If you've got a lot of 1P loads on a 3P service-- lighting, office receptacles or

Re: [RE-wrenches] 3 Phase With 2 Inverters?

I really don't understand what your problem with this arrangement is. How would this be different from a house on phase A-B installing an inverter and the next house on Phase B-C installing an inverter? Or, installing two single phase 240V A/C units in a three phase building? Electricians have no

Re: [RE-wrenches] 3 Phase With 2 Inverters?

Bill Brooks posted this in 2008. A couple of project-specific sentences were removed to avoid confusion. The 6kVA value comes from the California Rule 21 that I worked on. It only applies to split-phase 240V systems (6kVA on 120V). There is no specific limit for imbalance on a 3-phase service.