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Cdash's avatar
Cdash
Explorer
Jan 19, 2016

Solar - anyone regret getting PWM charge controller?

Looking to do a solar installation and have been studying up. Think I'm pretty good on most of it, however, still struggling with the charge controller. As I understand it, the PWM kind of "chops of...
christopherglen's avatar
christopherglen
Explorer
Jan 20, 2016
A 17/18 volt panel will be great with pwm. The higher 20-30 volt panels will fail miserably with it, and will rock with mppt.
Assume the pwm controller will charge at the panels rated amperage. The mppt will (attempt) to convert excess voltage into current (amps) going into the battery. The higher the excess voltage, the more current it can convert. A 20 volt panel may generate 10% more current on mppt, a 30 volt panel will be closer to 50+%.

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