mppt vs pwm

jrnymn7 wrote:
lol, yes, but I'm saying, unless the bank is very near full, mppt should REMAIN in bulk/mppt mode throughout nearly the entire charge. I don't see why a large load is needed to get it back into bulk, during a 50-9? % soc charge. With solar being at such a low amperage/C-rate, Vbatt should remain low enough to not initiate abs/constant voltage mode. Yes, once the bank is very near full, and now in cv, or already in float, then I can see a switch from cv back to cc when a significant load is applied.

I don't imagine many folks have a solar array large enough to put out more than a C/10 charge rate. (i.e; 700w solar for a 400Ah bank).

Yes the low charging rate means you get to Vabs at a high SOC in the 90s before amps taper. But what would they taper to? The acceptance rate is very low per battery by then.

I use 5 amps per 110AH as 90% SOC at 14.5v Say it is 2a per at 97% at 14.8 whatever it really is So that would be 8 amps with four batts.

So by the time you drop out of MPPT the acceptance rate could already be tapering the amps and the taper down would be at a deep slope with so little SOC to go.

Same whether MPPT or PWM for that. With the low battery acceptance rate, if this happens with the array capable of doing more, you get your "free" load running so you get a jump in amps when turning on a load. Not from some MPPT vs PWM thing but from in increase in the voltage difference with the load on.