mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
The "PWM" controller has no buck converter. Panel voltage = battery voltage plus a bit for line loss at the amps of the moment. The amps you get to the battery is on the panel's IV curve at that panel voltage. Same whether the controller is Shunt or Series.
With MPPT it is different. Now you have a buck converter so you have panel voltage and amps input making input watts, which comes out as watts and now you introduce battery voltage and get your amps to the battery.
Once the MPPT controller gets the batts to the high voltage set point, the MPPT stops and now you are in "PWM Mode" but the buck converter is still working, so it is not like the "regular" PWM controller where panel voltage = battery voltage.
The efficiency of the buck converter is important for the MPPT controller.
With MPPT it is different. Now you have a buck converter so you have panel voltage and amps input making input watts, which comes out as watts and now you introduce battery voltage and get your amps to the battery.
Once the MPPT controller gets the batts to the high voltage set point, the MPPT stops and now you are in "PWM Mode" but the buck converter is still working, so it is not like the "regular" PWM controller where panel voltage = battery voltage.
The efficiency of the buck converter is important for the MPPT controller.
