Battery protection: Stops overcharging and deep discharge
Voltage regulation: Maintains stable charging voltage
Current control: Limits output to 20A maximum
Reverse current protection: Prevents battery from draining back into solar panels at night
Types
PWM (Pulse Width Modulation):
More affordable, commonly used in basic solar systems
MPPT (Maximum Power Point Tracking):
More efficient, extracts more power from solar panels, especially in low sunlight conditions
Typical Use
Solar home lighting systems
Small off-grid setups (cabins, kiosks)
Charging 12V or 24V battery banks
Solar backup systems for basic appliances
Compatibility
A 20A controller typically works with:
Solar panel arrays around 200W–500W (12V systems) or higher depending on voltage setup.