[RE-wrenches] Inverter for Switch to GT

[Cary Lane]

Inverter for Switch to GTHi Allan,

I have an SMA 1100U in stock that I did not use on a system once I found out the 240VAC was really 208VAC.  It may have been hung on the wall but I don't think I ever turned it on.  It would work with the 12 modules great and would be marginal in hot weather for the 10 modules.  Let me know if you are interested.  I am sure we could work out something.

Thanks,
Cary


Cary Lane
Energy Concepts Corporation
HC 68 Box 11AA
Sapello, NM  87745

Ph: 505-425-2962
Fax: 505-213-0985

Email: cary at energyconcepts.net
Web page: www.energyconcepts.net
  ----- Original Message ----- 
  From: Allan Sindelar 
  To: RE Wrenches 
  Sent: Wednesday, August 06, 2008 8:55 AM
  Subject: [RE-wrenches] Inverter for Switch to GT


  Wrenches, 
  Occasionally, but more frequently recently, we get requests to turn off-grid systems into grid-tie systems. Usually this involves sale of a property to a new owner, and either grid is brought in to facilitate an easier sale or the new owner brings it in. Once grid is in, the off-grid-based system is of limited utility, as the equipment won't sell back. Most of these new owners want a maintenance-free batteryless system.

  Unfortunately, most off-grid arrays don't easily convert, as the string sizing doesn't match. Here's my question: I have two of these requests right now. Both are systems we installed in the late 90s. One has ten BP 275s, one has twelve. These are standard 12V 75W modules common to that time. I need advice on inverters that will work with these strings.

  The Sunny Boy 700, which is the only small inverter model SMA still offers, will handle one string of up to nine of these in our temperature range. Larger models require higher string voltage. Fronius also requires higher voltage.

  You know, it's a real problem to have to explain to new green-oriented homeowners that there's nothing I can do with their ten-year-old PV system to make it spin their new meter backward. It doesn't do much for the mainstream perception of PV for these folks.

  What will work with these existing arrays, please? 

  Allan Sindelar 
  allan_(at)_positiveenergysolar.com 
  NABCEP certified solar PV installer 
  Positive Energy, Inc. 
  3225A Richards Lane 
  Santa Fe NM 87507 
  505 424-1112 
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