Solar Panels
Good evening all, I have a HR Class A that we purchased used. It has three solar panels on the roof that are stationary. The solar system is charging the batteries, (4 6V GC 140Ah units new this ...
Forum Discussion
grumpy3b wrote:FYI It depends: PWM controller use the full panel amps which go slightly up with increasing temperature. Panel power used for MPPT controllers decreases much more with increasing temperature. So depending upon panel temperature there may not be any significant difference between the 2 controllers.
if you do need to update the solar charge controller I'd suggest to get an MPPT type controller. They are far more efficient that the PWM controllers.
This is for 12V batteries and 12V panels. 12V batteries and 24V panels require MPPT of course.
Lower temperatures have the opposite effect on the panels.
Plus there is about a 5% efficiency loss with MPPT controllers.
Check your panels temperature coefficients. Amps will have a positive value. Voltage or power will have a larger negative value.
12V panels with larger lower loss wiring would help with the power produced by an MPPT controller.
Lots of factors.
