Hi Rich If there are no AC loads, only the inverters then there is no derate for the panel buss. However if you connect any other loads such as a metering device, now you have to apply the 120% rule.
Jay Peltz Power On Jan 22, 2012, at 4:53 AM, "Rich Nicol" <r...@solartechvt.com> wrote: > Good Morning Wrenches, > I’m wondering if anyone has an advice on preferred methods and > component/panel recommendations for paralleling multiple inverters. The > proposed system will utilize 4 SMA6000 inverters (100 amps) and will be a > ground mounted system with inverters located outdoors in the cold frigid > temperatures of Vermont in a farmer’s field so the panel where we complete > the parallel connections needs to be outdoor rated (although it will be > sheltered from the worst of the elements). It will be a standalone system > with a dedicated utility power drop/meter for the system. My understanding of > using a load center in this applications is that the 120% rule will apply as > it does in a typical installation per NEC690.64(B)(2)with the bus amp rating > for the load center based upon the inverter feed side as well as the over > current device on the utility side. > Any input regarding preferred panels and configuration is appreciated. > Thanks > Rich >
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