The best replacement for charge controller is voltage regulator.

The best alternatives to charge controller are rated as following:

★★★★★	voltage regulator
★	mppt

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Speaking about charge controller, one probably shouldn't forget about inverter.

Other search terms related to charge controller and their ratings are:

★★★★★	inverter
★	equalization
	grid tie inverter

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Google Trends

Scale is based on the average worldwide traffic of charge controller in all years. Click on graph for more.

charge controller

voltage regulator

mppt