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I don't have an E-vehicle of any kind. However, I can't understand why everyone puts the controller, so the heatsink or cooling fins are usually on the underside of the controller. Why not stand it on end or upside down and release all that heat quickly ??

As a poor example, my cheap Chinese DSL Modem has NO cooling holes on the top side. It gets so hot I can barely hold my hand on it. I have turned it bottom side up, and, it works MUCH better. No intermittent disconnect-reconnect. You can feel the hot air rising out of the cooling slots, VERY easily ??

Yes, I'm slowly gathering parts to build my E trike motorcycle , so, I read this site several times per day. GREAT info here.
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