Salvo wrote:
Proof is in a test.
MPPT controller output current is: I = Psolar / Vbat
That means, the lower Vbat the greater the charging current. A pwm controller outputs constant charging current, regardless of Vbat.
The OP just needs to record charging current at different battery voltages while the controller is in bulk charging mode.
If absorption voltage setting is 14.7V, then record current when Vbat = 14.6V. Now connect inverter and drop Vbat to 12.6V. You should be able to drop voltage in a few minutes. We're just dealing primarily with surface charge.
If it's a mppt controller (and solar outputs 100W) then current will change from 100W/14.6V = 6.85A to 100W/12.6 = 7.94A.
You should see about 1A swing with mppt and no difference with pwm.
Bend wrote:
Seems no coil therefore no MPPT:
https://www.youtube.com/watch?feature=player_embedded&v=KA3X8XLxWHU
150W /12.6 = 11.904. Sorry, I saw 8.8 Amps at 12.65V Not a MPPT, not by your calculations. PWM, and I need to run the battery lower before I try it again, and have a no cloud day, and have it in spring of summer, to see the full effect, it's mid Novemeber now, not likely to get the whole enchilada for power the panel is capable of this time of year. Sucking down 50 or 60 amp hours in 24 hours would be a big day, electrically, for me. Should not be too hard to get 6 or 7 hours worth out of the panel in Quartzsite this winter if aiming it 3x a day.
