Solarmax 20AH CHARGE CONTROLLER

• Voltage compatibility: Most 20A controllers automatically detect and work with both 12V and 24V battery systems.
• Multiple protection features: They include built-in protections against short circuits, reverse polarity, over-current, and over-charging to protect both the battery and the solar system.
• LCD or LED display: Many models come with a built-in screen that shows system status, battery voltage, and other key charging parameters.
• Multi-stage charging: Modern controllers use a multi-stage charging process (such as bulk, absorption, and float) to optimize battery health and prolong its lifespan.
• USB charging ports: Some versions offer USB ports for directly charging small electronics, like mobile phones. 

Sizing your system for a 20A controller

To determine if a 20A controller is suitable for your setup, you need to calculate the maximum current from your solar panels. A general guideline is to ensure the controller's rating is 25% higher than the maximum current from your solar array. 

For a 12V system:Maximum solar panel wattage: Multiply the controller's amperage by the battery voltage:

• Example calculation: A 120W solar panel would produce 10A ( 

For a 24V system: 

• Maximum solar panel wattage: 

20A×24V=480W20 cap A cross 24 cap V equals 480 cap W

20????×24????=480????

• . To allow for the 25% buffer, your total solar panel wattage should be around 400W or less.

120W/12V=10A120 cap W / 12 cap V equals 10 cap A

120????/12????=10????

• ), which a 20A controller could safely handle.

20A×12V=240W20 cap A cross 12 cap V equals 240 cap W

20????×12????=240????

• . To account for the 25% buffer and ensure safe operation, your total solar panel wattage should be around 200W or less.

20AH CHARGE CONTROLLER