Before performing this test, do a quick voltage test of the battery to make sure it has adequate power. With no load on the battery, the voltmeter should read around 12.6 volts or more.

PVcase has developed a new solution to calculate expected voltage drop in different PV cable configurations. The solution is available as part of its planning software for ground mount PV systems.

one pair of wires carries current to the device under test and the other pair of wires measure the voltage drop. If you wonder why that’s better than two probes, it all comes down to resistance ...