Simple. BLDC motor? Have a mechanical linkage from the motor rotor connected to a movable shade over three groups of solar panels so you get commutation. Wa-lah! LOL ok jk. Seriously though, doesn't seem very practical. Power MOSFETS are only a couple bucks apiece at Mouser. What kind of motor you using? For a brushed DC motor you can get by with a pretty simple controller or even none at all if you want to get right down to it, but a ready made controller isn't THAT expensive. Cheaper than your batteries, for sure.
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