Guides
Plug-in solar questions answered with our own calculator. Every number comes from the same model as your result, with the inputs and run date shown.
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UL 3700 or UL 1741? What your state's plug-in solar law says
States don't all name the same safety standard for plug-in solar. See what your state's law asks for, what UL 3700 and UL 1741 cover and how to check kits.
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Railing, patio or fence: what direction does to your savings
We modeled the same 800 W kit facing 8 directions, on a railing and on a patio. Output changes almost 5×. Savings change far less. Here's why.