Solar Voltaic Charge Controllers
Solar voltaic panel output should never be directly connected to a battery as the unregulated current from the solar panels will damage the batteries. The primary function of a Solar Charge controller is to fully and properly charge a battery bank without permitting reverse current flow to the solar voltaic panels at night.
Primary of types charge controller:
On/Off type Solar Charge Controller
Pulse Width Modulation (PWM) Solar Charge Controller
Maximum Power Point Tracking (MPPT)
Sizing the Solar Charge Controller
All Solar Charge Controllers are rated by the amount of array amperage (current) and voltage they can handle. Amperage ratings run from 1 amp to 90 amps, voltages from 6 to 60 volts. The charge controller should be sized to handle 25% more current than the panels are rated for. Many people have added solar panels as they go along . Size the charge controller to handle your needs into the future.