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You are right, that contractor doesn't know what he is talking about. Most inverters will produce power at low wattages as long as the Vmp of the string (maximum power voltage) doesn't fall below the spec in the data sheet for the inverter. Most inverters are actually more efficient when operated below full load. For example the Sunny boy 11000TL-US will has ...


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I am assuming that you have 220V going to the barn? As far as wire size, industry standards say to aim for 1 - 2% voltage drop, but running 5000W, 200ft on #8 wire @ 220V results in just under 3% voltage drop. This will probably work just fine but it would work a little better if you were to upgrade it to a #6 or a #4. It is just a matter of weighing the ...


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There are multiple ways of looking at this, high quality 12V LEDs are hard to find and can be quite expensive... however some people are very satisfied with the 12V LEDs that are available. Transformers also waste energy but the efficiency can vary greatly. As long as you are on the grid, I would use higher voltage LEDs since they're cheaper and you'll use ...


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Sadly not much. 100W would not effectively heat a 40 gallon water heater, let alone an 80 gallon. Also, remember that the panel likely won't really put off 100W unless your element has the exact right resistance for your specific panel. You can do some simple calculations if you're curious how much heat that will produce... If you use 100 Watts for 4 ...



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