mppt vs pwm

BFL13 wrote:
"...boondocking, I appreciate being able to set the float higher (13.6V) so MPPT kicks in earlier at a higher voltage."

I missed that. Confusion over the set point for when the controller kicks back into Bulk and the setting for the Float voltage

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.

Exactly. The Rogue is different. Your MPPT kicks in at 13.2V, the Rogue kicks in at whatever the FLoat voltage is set for. In my case, 13.6V when boon docking. And I've set my absorption stage to kick in at 14.8V instead of the 14.4V in your example.

So if the loads (and low sun) initially keep battery voltage below 14.8V, the Rogue will be in MPPT mode all that time. If the loads are lower or the sun is better, when 14.8V is reached the Rogue switches to Absorb and maintains 14.8V for a set time period or until the battery charge current drops to a set point. If the sun goes behind a cloud or the loads increase so that the voltage falls below 14.8 again (0.2V below the set point), the Rogue goes into MPPT again. And so on.

If however the Absorb voltage (14.8V) can be maintained over the set time period, the Roque then stops charging (Full mode) and allows the battery voltage to fall to the Float voltage (13.6V) and then tries to maintain that indefinitely. If it cannot maintain 13.6V, it switches to MPPT and the whole cycle restarts as long as there is light and watts available from the solar panels.

If you like, both Absorb and Float modes can be disabled, so the Rogue will use MPPT up to the Absorb set point (14.8V), then stop charging (Full mode) until the battery voltage drifts down to the Float setpoint (13.6V) when MPPT starts again. Repeat as long as there is sufficient sunshine.

Anyway, by adjusting these setpoints, you can have as much or as little of the MPPT mode as you or your batteries would like.