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PWM solar charge controller
PWM controller, pulse width modulation controller, budget solar controller, cheap solar charge controller
A PWM (Pulse Width Modulation) solar charge controller is a simple, inexpensive controller that pulses the panel output on and off to clamp panel voltage at battery voltage. Cheaper than MPPT but 20–30% less efficient.
Suitable when panel voltage closely matches battery voltage (one 12 V panel + 12 V battery), in small systems up to 100–150 W, and in warm climates. For systems of 200+ W, panels wired in series (24/36/48 V), or operation in cold or cloudy weather, MPPT yields 20–30% more output and pays back within a season. Cheap "MPPT" controllers on marketplaces are often relabelled PWM — check the brand (Victron, Renogy, EPEver).
FAQ
MPPT or PWM — which is better for a motorhome?
For systems of 200 W and above, MPPT is almost always the better choice — it harvests 20–30% more energy by tracking the panel's maximum power point. PWM only makes sense in very small systems (a single 12 V panel up to 100 W) in consistently sunny regions where the efficiency gap is not critical.