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Re: Doesn't make sense to me
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Posted by jdemaris on November 18, 2006 at 06:09:41 from (69.67.230.86):
In Reply to: Re: Doesn't make sense to me posted by doogdoog on November 18, 2006 at 00:35:51:
I don't consider it feasible myself. In regard to running an underground service 400', all that was needed was spending a few more bucks for the correct size cable and using 220 VAC. I cannot imagine why a qualified electrician would recomment #2 aluminum for a 400' 100 amp sercive. In regard to 48 volt systems, I've had that issue here. I've got a 48 volt, DC, 5500 watt solar array that as originally going to be 400 a foot run to my house. Running it all in one cable was not feasible. One option was a bunch of separate DC strings - but since 48 VDC is the highest my inverter can use, it would not work well running that long of a distance. Each solar panel is 175 watts and 24 volts, so I could of run multiple 48 VDC, 14 amp strings and MANY wires. That's why many solar arrays now use inverters that can run at 600 VDC instead of 48 VDC. Problem is - those systems are for grid-tie systems that will not work without grid-power. My system can work both ways. I also could of installed the battery bank outside with the solar panels and eliminate the DC run to the house. With the inverter plus booster outputting 480 VAC at 110 amps, the run would work with 2/0 aluminum. I decided the heck with it, and spent the past summer escavating the side of a mountain - in order to create a site for the solar array closer to the house. It's now at 140' instead of 400'. It still needs 4/0 aluminum at 120 VAC, or 1/0 at 240 VAC.
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