All BLDC motors will be mostly waterproof out of the box, as long as you don’t use sensors. Water will shorten the bearing life but you can change the bearings. Motor hall sensors seem really prone to failure for some reason, and if you haven’t personally went in there and waterproofed them yourself, then there’s little chance they’ll last very long. Even so, way more reliable to simply not use them at all. Only connect the 3 big phase wires.
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