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A 20 amp MPPT (maximum power point tracking) solar charge controller is a device that is used to regulate the charging of a battery bank from a solar panel array. The maximum current rating of the controller, in this case 20 amps, indicates the maximum amount of current that the controller is capable of handling. This rating is important because it determines the size and number of solar panels that can be used with the controller, as well as the size of the battery bank that can be charged.
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