The best replacement for mppt is pwm solar charge controller.

The best alternatives to mppt are rated as following:
★★★★★  pwm solar charge controller
★★★★★  pwm controllers
★★★  pwm
★★  pwm charge controller
★★  pwm controller
★  pwm regulator

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Speaking about mppt, one probably shouldn't forget about boost converter.

Other search terms related to mppt and their ratings are:
★★★★★ boost converter
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