Better controllers use a higher frequency so that you can't hear it. Nicer ones occasionally send a different frequency to kill any resonance from building (like, 1/100 cycles will be slightly off, so that it never gets a chance to "sing" at a certain frequency, like pushing someone on a swing at the wrong timing, they never get a chance to build height).
I've been thinking of making a "Who's finished a project recently?" list, as there aren't actually that many to note, probably not even one a month. Yours would be on the list
The whine might just be normal brush noise. You might try pulling the brushes and put a slight chamfer on the leading and trailing edges of the brushes. If the noise goes away-it's probably the brushes. The noise will probably come back as the brushes wear.
So more changes for the boat, today I collected 30 x 36 volt valance batteries I will connect 15 in parallel twice then connect them in series to give me 72 volts. I am still awaiting my new controller from Cedric in the hope of getting rid of the whine.
I am hoping that the batteries and slightly increased voltage give me a longer no sun range and slightly better performance fingers crossed for both, I do wonder sometimes at our sanity when we start these projects but cruising along in near silence makes it all worth while
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