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BFL13

Victoria, BC

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Joined: 02/15/2006

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Posted: 02/08/20 06:29am Link  |  Quote  |  Print  |  Notify Moderator

In MPPT Bulk it seeks Vmp. In PWM mode in Absorption and Float it lets go of Vmp and does "on demand" with voltage varying (not constant) The voltage appears to go higher than Vmp down the knee and back up the knee if demand increases. Actually it is turning on and off (PWM) with durations varying.


1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
See Profile for House electronics set-up.
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas

babock

Los Angeles, CA

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Joined: 12/18/2007

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Posted: 02/08/20 03:26pm Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

In MPPT Bulk it seeks Vmp. In PWM mode in Absorption and Float it lets go of Vmp and does "on demand" with voltage varying (not constant) The voltage appears to go higher than Vmp down the knee and back up the knee if demand increases. Actually it is turning on and off (PWM) with durations varying.
What happens when you have multiple panels in series and the VMP is over 40V? That's right...has nothing to do with Vmp

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