Hi Matt -
I think I know which site you are referring to, and the issue there was not an inverter temperature problem. The units were running at or colder than the rated minimum temperature for GT's... and other than for the LCD not being very readable this is not a problem. We routinely test all our inverter designs in our Highly Accelerated Life Test (HALT) chambers at down to -65C, and the units work pretty well. The issue with this particular site was the very high open circuit voltage caused by those very cold arrays. When we designed this custom version of the GT for this particular OEM we had not anticipated such high voltages - using our normal string sizing approach each string should have contained one less module under the conditions the site ended up with. Once we had evaluated the site we did a field upgrade to the units to handle the high Voc, and the units were working to everyone's satisfaction after that. Thanks for your concern about our bottom line! Cheers, Mark From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matt Lafferty Sent: Sunday, August 31, 2008 10:52 AM To: 'RE-wrenches' Subject: Re: [RE-wrenches] Inverter temp spec for cold regions But then there's the Xantrex GT.... Not your cold-weather friend. I know of a project in CO that had to replace approx 280 of them last winter. Word I got was that the actual low-temp was warmer than the spec. I recommended against using that inverter in that application, for this and other reasons that I won't go into here. The project engineers bought Xantrex's story that they would be fine. Guess they were for a month or so.... At least part of me hopes that Schneider will put a stop to the historical release of products and engineering by Xantrex that doesn't pass muster.... These practices aren't good for the bottom line, no matter what kind of beans you're counting. Sunshine Wishes, Matt L
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