Calling on Solar Techies
I have been thinking of going solar for some time and decided to pull the plug. My wants are a 400 to 500 watt system. I have four 12 volt batteries with 340ah. I am not planning on changing b...
Forum Discussion
I specifically mean the method used to maintain a set voltage. Nothing to do with how it "makes" amps. The controller controls the output voltage. How?
One way is PWM. AFAIK, the MPPT controller uses that method in Absorb and Float. Assuming it does, that does not make it a "PWM controller" (which does not have MPPT, a buck converter, and does use PWM).
Older controllers, not PWM, "controlled" by just not letting the battery voltage rise above the "high set point". They shut off and waited till battery voltage fell to a lower point and then let the battery voltage rise again to the high set point. AFAIK that is called "shunt controlling". Even "low frequency PWM" :)
PWM is able to hold the voltage at the set point. MPPT controllers do that, so if they are not using PWM to do it, how do they?
One way is PWM. AFAIK, the MPPT controller uses that method in Absorb and Float. Assuming it does, that does not make it a "PWM controller" (which does not have MPPT, a buck converter, and does use PWM).
Older controllers, not PWM, "controlled" by just not letting the battery voltage rise above the "high set point". They shut off and waited till battery voltage fell to a lower point and then let the battery voltage rise again to the high set point. AFAIK that is called "shunt controlling". Even "low frequency PWM" :)
PWM is able to hold the voltage at the set point. MPPT controllers do that, so if they are not using PWM to do it, how do they?
