mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
Hi jrnymn,
I routinely get 17 amps from 256 watts. MPPT controller.
When your bank is at 85% state of charge you could still want ~65 amps of charging. Mine wants about double that. But you can equalize and I can not unless I use bank switching.
Since I paid $8 per watt installed I suspect your system cost 25% of mine. At that price, the extra 8 to 10% of solar harvest made lots of sense. ( ~20 extra watts @ $8 per watt = $160)
I routinely get 17 amps from 256 watts. MPPT controller.
When your bank is at 85% state of charge you could still want ~65 amps of charging. Mine wants about double that. But you can equalize and I can not unless I use bank switching.
Since I paid $8 per watt installed I suspect your system cost 25% of mine. At that price, the extra 8 to 10% of solar harvest made lots of sense. ( ~20 extra watts @ $8 per watt = $160)
jrnymn7 wrote:
For example, my 280 watts of 12v panels have a combined Isc of 16a. Let's say that drops slightly to 15a.
On my bank, that's... 430Ah / 15a = ~ C/28
When charging at a C/4.8 rate, I see a switch from constant current to tapering current at ~83% soc. So at C/28, wouldn't that keep either controller in bulk/cc very deep into the charge?
If so, shouldn't mppt have the advantage (panel temp aside) throughout nearly the entire charge, even without any added loads, seeing as my bank can accept over 30a at 90% soc and a Vabs setpoint of 14.8v?
Moreover, wouldn't solar charging Lithium have the same effect, as they can accept huge amounts of current well into the charge?
