Frequently Asked Questions
What is the difference between a PWM and MPPT charge controller?
A PWM controller connects the panel almost directly to the battery and only works well when panel Voc is close to bank voltage. An MPPT controller tracks the panel maximum power point at any voltage, harvesting up to 30 percent more energy, and is the right choice for medium and large systems.
How do I size the charge controller I need?
Divide total array watts by system voltage (12, 24, or 48 V) to get peak current, then add a 25 percent NEC safety margin. For example, 1,200 W at 24 V = 50 A; with the margin you need at least a 60 A controller.
Does the charge controller protect batteries from overcharging?
Yes, that is its primary job. Modern controllers taper or cut off charging when the battery reaches full voltage and periodically trigger an equalization charge on lead-acid banks to extend cycle life and balance cells.
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