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SEE PHOTO GALLERY FOR ALL TECHNICAL INFORMATION AND DIMENSIONAL DRAWING. WindyNation's P30 Solar Charge Controller uses advanced microprocessor technology to properly charge and maintain the charge of 12 and 24 volt batteries. The P30's PWM (pulse width modulated) battery charging technique increases the lifetime of batteries by properly charging the battery through a Bulk, Absorb and Float charging process. The PWM capability also allows the controller to operate very efficiently and consume very little power.