Posted by docmirror on August 22, 2019 at 16:30:13 from (107.213.165.255):
In Reply to: Solar panel update posted by philip d on August 19, 2019 at 13:59:56:
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I've done three residential solar installs. I'm guessing the WalMart fires were related to arcing of the voltage where panels have been run in series, and igniting some kind of roof material. The panel itself won't burn except for some plastic bits.
The max working voltage for any large poly panel is usually between 1000 and 1500VDC. If the open circuit voltage of the 300W panel is ~40 volts, then one could string 37 of them in series before exceeding the 1500VDC value. Also, it is only the two end panels that will see any kind of voltage like that, as the middle panel will obviously be only the single open circuit voltage.
My experience was much lower voltage, but I consider the wiring and connectors I've seen to be substandard.
My son has looked at solar on his roof several times, and I help him see that the payback that solar sellers predict is wildly optimistic. Plus, if ones state does not buy-back Kw from the grid, the value becomes very marginal. Even with the great reduction in panel cost per watt, it's still relegated to off-grid solutions.
My off-grid installs also come with a Champion duel fuel 3400W genset. It has a pushbutton start, variable load run mode, will run plenty of motors found in a common home, and are needed when sun power is scarce in Feb/mar for much of the nation. The inverter I use has an option for generator input, and will sync the inverter power to the generator to reduce fuel use. Combined with using Propane on the get, this makes for a very efficient package, with almost no chance of loss of power as long as there's a propane tank around. If one runs out of propane, it will run on gas until the propane truck shows up.
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