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PWM Controllers
Pulse Width Modulation (PWM) is the most efficient method to achieve a constant charging voltage. When regulated via PWM, the charging current coming from the PV panels is reduced according to the battery condition and charging needs.
Charging a battery with a solar panel is a difficult undertaking. In the "past" elementary regulators were used, which simply turned on or off current to the batteries. But, as solar technology advanced, it became clear how much these rudimentary regulators were harming the battery charge.
Most often, they have led to premature "dying" of batteries and increasing customer dissatisfaction.
PWM solar controllers use technology very similar to that of modern battery chargers. When the battery voltage reaches its peak, the PWM algorithm slowly reduces the charging current to prevent the battery from overheating and boiling. The result is a high charge efficiency, a strong battery and a long life.
