Collection: PWM Solar Charge Controllers

PWM solar charge controllers: Victron Energy BlueSolar PWM-Pro 12/24V at 10A, 20A and 30A, programmable, and BlueSolar PWM DUO-LCD&USB 12/24V at 20A, which charges two separate banks and has display and USB socket.

PWM works nothing like MPPT: it ties the panel straight to the battery and regulates with pulses, so the array is pulled down to battery voltage and the surplus power is thrown away. On a nominal 12V panel the loss is small; above 30V it gets serious.

So it pays on small systems with 12V modules: it costs less, has no fans and very few parts that can fail.