Originally Posted by dj2109
Manual says its a PWM. Should I upgrade to MPPT?
if you want to squeeze max power out of your panels, particularly during the winter, then yes, you may want to upgrade.
As John says 10% to maybe 20% is probably a realistic expectation for improvement, but depending on conditions the difference can be anywhere from 0% to 30%
Looks like you are using "20V" nominal panels (60 cell) what is your battery bank voltage?
I don't know a ton about PWN, but it was my vague understanding that 24v battery banks were usually paired with 72 cell panels and 12v battery banks were usually paired with 36 cell panels, and 60 cell panels were popularized once MPPT caught on. Maybe John or someone with more PWN experience can comment on this.