Friends:
It is quite rare for us to install off-grid systems on roof-tops. We have one coming up with about 20kW on a large barn roof. This will be our first off-grid with a module-level rapid shutdown requirement. I see no exemptions from RSS for off-grid systems in the code. I have looked at the options and this is what I have found: 1. Fire Raptor 2. Tigo TS4-F 3. AC coupling with micro-inverters or optimizers No one of these approaches seems ideal. The fire raptor requires extra wiring for control leads. The Tigo requires a wireless control system which worries me about reliability. With AC Coupling systems floating the proposed AGM batteries may be awkward. Furthermore, with AC coupled systems one cannot charge batteries unless the mini-grid is operational, a big problem. Have any of you implemented module-level RSS on a battery-based inverter system? I looked in the archives and found no threads that apply. Thank in advance. William Miller Miller Solar 17395 Oak Road, Atascadero, CA 93422 805-438-5600 www.millersolar.com CA Lic. 773985
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