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
Here is that shunt controller's blurb, where they tried to "talk modern" by calling what they do a form of PWM:
"CHARGING METHOD: Low Frequency Pulse Width Modulation : - The ASC
provides pulses of charging current at varying durations to maintain the batteries at a full state of charge and insure the long-term health on the batteries. The “on” and “off” cycle time is wide enough to eliminate electronic noise and short enough to insure the batteries are always topped off."
That bit in the previous post about the controller limiting its amps in Absorption is not right--the controller holds its voltage and the battery limits the amps.
Red31 showed us his graphs of how the MPPT controller changes its durations of on and off rapidly during Float when there is more or less "demand" The voltage goes from Voc when off to a voltage back up the IV curve when on, so there is an apparent voltage and a current to go with that. He explains it much better!
"CHARGING METHOD: Low Frequency Pulse Width Modulation : - The ASC
provides pulses of charging current at varying durations to maintain the batteries at a full state of charge and insure the long-term health on the batteries. The “on” and “off” cycle time is wide enough to eliminate electronic noise and short enough to insure the batteries are always topped off."
That bit in the previous post about the controller limiting its amps in Absorption is not right--the controller holds its voltage and the battery limits the amps.
Red31 showed us his graphs of how the MPPT controller changes its durations of on and off rapidly during Float when there is more or less "demand" The voltage goes from Voc when off to a voltage back up the IV curve when on, so there is an apparent voltage and a current to go with that. He explains it much better!
