Designing a solar system would be easy if money, space and weight didn’t matter—and you could install panels anywhere you wanted. That usually isn’t reality. Before calculating how many solar panels you need, how much battery storage to buy or what size inverter to install, you need to identify the limitations you’re designing around. Those…
A used solar panel can produce voltage and still be unable to deliver the current and power you expect. That means a quick voltage reading—or a clean appearance—doesn’t tell you the whole story. Before I mount and wire my stack of used panels, I need to separate the usable panels from the damaged or badly…
Learn how series, parallel and series-parallel solar-panel wiring changes voltage and current, including practical connection examples.
Learn how to find and understand the five most important numbers on a solar panel label: Pmax, Vmp, Imp, Voc and Isc.
Learn the essential numbers behind a solar power system—including volts, amps, watts, watt-hours, kilowatt-hours and battery amp-hours.