From my understanding the PWM will basically reduce the voltage to what is required for battery charging, but doesn't change the current (amps).
For example, if you had 440 watts at 30 volts from your panels, you would have about 14 amps current coming in from the solar panels. The charger, though, would cut volts down to say 14.8 volts at the same 14 amps, or about 207 watts at the battery.
An MPPT charger, though, can reduce the voltage and increase charging current. In other words, with 440 watts of 30 volt panels, you might see 29+ amps at 14.8 volts at the battery.
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