The charge controller performs a vital function in the PV system, ensuring that the battery is not subjected to overcharging or overly deep discharging which could prevent them it delivering its rated capacity or even cause premature failure.

"Recommended Practices for Charge Controllers" is a handbook aimed primarily at users, operators and integrators of autonomous PV systems. It contains advice on how to choose, configure and maintain controllers, as well as information on troubleshooting problems and test procedures used to verify satisfactory functioning.