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Wrenches: This has been addressed before in a slightly different context, so a short answer is enough. Can a Sunpower module be used successfully in a negative-grounded low-voltage system? The situation: Mark in our Taos office sent me the following: "We have an old time friend and customer. [John] and his wife used to help us on various installations years ago. They're both retired now and living on fixed limited income. About two months ago, we sold them a replacement battery bank of golf carts. They have a small off grid system with a few hundred watts of PV. Recently, [John's wife] was put on an oxygen machine for a heart condition. The machine consumes somewhere around 800 Watt-hours per day. Their system can't keep up now without running the generator most every day. I was wondering about a couple blem/cosmetic damaged panels that PosE has at their shop in Santa Fe. I'm not sure yet whether the best solution would be to upgrade their existing system, or perhaps a separate system for the O2 machine. Either way, if there is a way to help them with the equipment, then I'd be happy to donate my time to help [John] do an upgrade. If there is some way we can help them out, it would be a good thing. They're just a couple of really good people who've helped a lot of others out in their lifetime. Now they're the ones in need, and I'm just trying to find a way to help them." We have two Sunpower 215s with cosmetic damage that can't be sold. I think that one or both can be used here, but are just somewhat less efficient if negative grounded. What's the straight scoop here, please? Thanks, Allan
Allan@positiveenergysolar.com |
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