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You'll notice that solar charge controllers are specified by both amperage and voltage. You will need a solar controller that matches the voltage of your solar panel array and battery bank. (Usually 12, 24 or 48 VDC) And you'll want to make sure the solar charge controller has enough capacity to handle the current (in amps) from your solar panel array. The basic formula for sizing a solar panel charge controller is to take the short circuit current (Isc) of the array, and multiply it by 1.56. (What is short circuit current? Glossary of Alternative Energy Terms & Why 1.56? See Sizing PWM Solar Charge Controllers and Sizing MPPT Charge Controllers). Be sure that the solar controller you select can handle at least that many amps. Please protect this important part of your system with appropriate overcurrent protection before and after the solar controller.