mppt vs pwm

Salvo wrote:
No, not correct. Both the pwm and mppt controllers use pulse width modulation to control output voltage during absorb and float.

The 3048 manual discusses changing pulse widths during the maximum power point discussion. Do you understand what changing pulse widths means? It's pwm!!! The mppt controller uses pwm to achieve the maximum power point and it also uses pwm to achieve constant voltage output during absorb and float.
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Again, forget output voltages. Look at panel voltages.

During the float or absorb stages the mppt controller maintains voltages on the panels that are different from the battery, whereas the pwm controller does not. They are obviously not doing the same thing.

The mppt controller is certainly using some form of pulse width modulation, but that doesn't make it's behaviour identical to a PWM controller during float or absorb states.