mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
How far up in SOC you get is just to do with the array size, battery bank size, how far down to start with and how long the daylight is and how much you use during the day while trying to recharge at the same time. Can't see what type of controller you have matters.
The little shunt type seem like they would be good for float charging. Get the batts to 14.3v, quit, wait till the batts get back to 13.2 and goose them back up to 14.3 again. Plus the batts slide at night. Must make an average float voltage somewhere in the 13s.
"Interrupted" charging above 80% SOC might allow the batts to cool a bit between shots so more of the recharge AH goes into SOC and less into heat? Mex might have something on that. ( I don't!)
Edit: I read that Morningstar link. I think I caught that PWM and "Series" are not the same? Series seems to mean the controller spends less time on as SOC gets near to full. The ASC did that too but only claimed that was Low Frequency PWM. It did have FETs in it, so maybe Morningstar was talking about them with "others" just fiddling with FETs and not doing it as well as their own algorithm PWM does?
Obviously the old shunt type spends a lot of time not charging while the battery drifts back down to the low set point, so much of the day would be "wasted" That seems to be what they really mean by low "average" SOC, longer time at less than full means more sulfated etc. ( A float charger would be ok with that keeping the already full batt above 12.7 by going between 13.2 and 14.3)
The little shunt type seem like they would be good for float charging. Get the batts to 14.3v, quit, wait till the batts get back to 13.2 and goose them back up to 14.3 again. Plus the batts slide at night. Must make an average float voltage somewhere in the 13s.
"Interrupted" charging above 80% SOC might allow the batts to cool a bit between shots so more of the recharge AH goes into SOC and less into heat? Mex might have something on that. ( I don't!)
Edit: I read that Morningstar link. I think I caught that PWM and "Series" are not the same? Series seems to mean the controller spends less time on as SOC gets near to full. The ASC did that too but only claimed that was Low Frequency PWM. It did have FETs in it, so maybe Morningstar was talking about them with "others" just fiddling with FETs and not doing it as well as their own algorithm PWM does?
Obviously the old shunt type spends a lot of time not charging while the battery drifts back down to the low set point, so much of the day would be "wasted" That seems to be what they really mean by low "average" SOC, longer time at less than full means more sulfated etc. ( A float charger would be ok with that keeping the already full batt above 12.7 by going between 13.2 and 14.3)
