Jim,
You have probably seen this already but it’s worth a mention here. Good article in SolarPro magazine April/May “Optimal PV-to-Inverter Sizing Ratio”. Dave From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Jim MacDonald Sent: Monday, April 19, 2010 7:43 PM To: RE-wrenches Subject: Re: [RE-wrenches] overfeed 7kW gridtie inverter or drop a mod per string? Im sorry, I meant to write “11 modules per string” below.. Been a long day.. From: Jim MacDonald Sent: Monday, April 19, 2010 7:41 PM To: RE-wrenches Cc: Jason Szrom Subject: RE: [RE-wrenches] overfeed 7kW gridtie inverter or drop a mod per string? SB8000US only good for 480 Vac, we’re tying in at 208. 11 strings [11 modules per string] has been calc’d to be OK (<600vdc) for record low -4 fahrenheit (-20 celsius). I think the big concern as mentioned is getting the Voc high early in the AM to wake the inverter up, also maintaining the Vmp later in the day to keep it running for as long as possible into the late afternoon/ evening. Will those extra kWh gleaned in the early AM/ late PM over the course of 365 days be more than the kWh clipped during peak production times with the 9.075 kWdc? NYC average summer highs between 79 and 84 fahrenheit early june-late august. Sunlink rack @ 10° on a silver-painted built-up roof. Time-of-use utility $ peak-shaving is not an issue here. Thank you
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