One clear advantage of micro inverters is that string size is not an
issue. Especially, dealing with ULA racking, where modules go up in
groups of 4, often good string sizing is not available. Sometimes
string sizing can be found at the bottom of the hot weather voltage
window for string inverters. Using minimum voltage may become a
problem a few years down the line when the modules degrade. We may
also see warmer weather, as we have gone beyond the 350 PPM trigger
point in atmospheric carbon (385 PPM). Micro inverters should bypass
these issues.
Also on a ULA ground mount system, inverters can be replaced without
removing modules.
At 09:44 AM 9/5/2010, you wrote:
Thanks for the discussion, I have found that for me there is no time
advantage in micro inverters. The wire management under the modules
slows me down. But for very small systems they seem to
advantages. The industry is rapidly changing, and with the code
2011 NEC and the arc fault protection clause, it will be a game
changer with module optimizers and microinverters taking the lead.
Darryl
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