ELI5, please, why a buck/boost module couldn't or shouldn't be used to regulate voltage of a solar panel instead of a 'charge controller' Charge controllers come in PWM and MPPT types, where would a buck/boost module fall in terms of efficiency?

Solar charge controllers

ted April 8, 2018, 5:47pm 6

Car battery can be charge safely by current 1/10 of it capacity, in your case 10.5 A, so use 14.4V from your solar and current limiter 10A.

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