mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
BFL said,
"I have no idea what this concern about falling out of MPPT early is due to clouds coming in. Impossible. You are in MPPT till you get to Vabs. If a cloud goes by setting you back in voltage, you are still in MPPT because you never got to Vabs yet"
So you're essentially saying I'm confusing Vabs Setpoint and 'available voltage'. Hmmm, that actually makes sense. Available (panel) voltage would be more like available ac line voltage to a power supply, which when too low, would lower ps output, but not kick the batteries into abs mode. So, decreased panel output would not cause the mppt to go out of mppt.
However, I would think the upper and lower set-points (Vabs and kick-in) would still cause the mppt to switch to abs prematurely, if either was set too low.
Quote, "When you set the Absorption Stage (the controller might call it Float) at 14.4 or whatever, which the controller maintains, the voltage does not drift down to 13.2 and then kick back into Bulk. It would only get down to that if you ran some loads for long enough and then it would kick in the MPPT and start over same as in the morning."
But wouldn't a higher "kick-in" setting cause the mppt to go into bulk sooner, and therefore increase the amount of time in bulk?
"I have no idea what this concern about falling out of MPPT early is due to clouds coming in. Impossible. You are in MPPT till you get to Vabs. If a cloud goes by setting you back in voltage, you are still in MPPT because you never got to Vabs yet"
So you're essentially saying I'm confusing Vabs Setpoint and 'available voltage'. Hmmm, that actually makes sense. Available (panel) voltage would be more like available ac line voltage to a power supply, which when too low, would lower ps output, but not kick the batteries into abs mode. So, decreased panel output would not cause the mppt to go out of mppt.
However, I would think the upper and lower set-points (Vabs and kick-in) would still cause the mppt to switch to abs prematurely, if either was set too low.
Quote, "When you set the Absorption Stage (the controller might call it Float) at 14.4 or whatever, which the controller maintains, the voltage does not drift down to 13.2 and then kick back into Bulk. It would only get down to that if you ran some loads for long enough and then it would kick in the MPPT and start over same as in the morning."
But wouldn't a higher "kick-in" setting cause the mppt to go into bulk sooner, and therefore increase the amount of time in bulk?
