And that's just what the PWM controllers do. That reduces the stress on the battery while ensuring it is fully charged. With the advent of the PWM controllers, it was possible to lower the current flow slowly as the voltage approaches a certain level. In the older days, solar charge regulators simply monitored the voltage of the battery and would stop the current when the voltage rose above a certain level. PWM is an initial, standing for "power width modulation". PWM Solar Charge Controllers PWM Solar Charge Controllers It preserves the life of the battery for as long as possible while preventing explosions.īefore we talk about the difference between the MPPT and PWM solar charge controllers, let's quickly see what each of these entails. That way, the device helps prevent battery damage. The main objective with a solar charge controller is to ensure the batteries are fully and optimally charged while preventing overcharging. Without a charge regulator, the battery can get overcharged, resulting in its damage. You see, each battery has a rating for the maximum voltage capacity.
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