mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
BFL13 wrote:
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The MPPT, which is not "on" in Absorb and Float, ensures that the best panel voltage is chosen as buck converter input, but only during Bulk. So what panel voltage is in effect during Absorb and Float instead of Vmp?
It can't be just battery voltage as with 12v PWM controllers, because you get more than Isc when running loads in Absorb and Float.
If you download the Rogue 3048 manual and look at figure 5.2.1, the top line shows the PV array voltage as the controller goes through MPPT to ABSORB to FLOAT.
There are annotations like "PV voltage rises, PV power drops to maintain absorb voltage" and "PV voltage drops, PV power rises to maintain float voltage". IOW, it maintains the float and absorb setpoint battery voltages by adjusting the PV voltage. Whereas in MPPT mode it adjusts the PV voltage for max power.
