[RE-wrenches] overfeed 7kW gridtie inverter or drop a mod per string?

Dave Palumbo dave at independentpowerllc.com
Tue Apr 20 04:13:09 PDT 2010


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-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at 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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