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
IMO (maybe not understanding) question not answered----
"In Absorb and Float, the controller starts turning the switch on and off (rapidly) while varying the ratio of time the switch is on relative to when it is off in order to reduce the *average* voltage at the programmed level (eg 13.6 V for float)."
AFAIK, that is what the MPPT controller also does in Absorb and Float. AFAIK that is called PWM, without considering whether current in equals current out.
Of course with a buck converter, the current in and out will depend on the input voltage to be higher than the output voltage or nothing happens. It uses Power in and Power out so the current is just the watts/voltage for both in and output watts. If the MPPT is doing 24-12 the output current will be more than the input current. But what does that have to do with how it maintains the set voltage?
Both types of controller will go back to Bulk from Float if there is enough load added to trigger it. If it is an MPPT it will do that tracking for MPP now it is in Bulk again.
If they both use the high speed switching to maintain the set voltages, why is one's switching PWM and not the other's?
"In Absorb and Float, the controller starts turning the switch on and off (rapidly) while varying the ratio of time the switch is on relative to when it is off in order to reduce the *average* voltage at the programmed level (eg 13.6 V for float)."
AFAIK, that is what the MPPT controller also does in Absorb and Float. AFAIK that is called PWM, without considering whether current in equals current out.
Of course with a buck converter, the current in and out will depend on the input voltage to be higher than the output voltage or nothing happens. It uses Power in and Power out so the current is just the watts/voltage for both in and output watts. If the MPPT is doing 24-12 the output current will be more than the input current. But what does that have to do with how it maintains the set voltage?
Both types of controller will go back to Bulk from Float if there is enough load added to trigger it. If it is an MPPT it will do that tracking for MPP now it is in Bulk again.
If they both use the high speed switching to maintain the set voltages, why is one's switching PWM and not the other's?
