I'd like to put a contactor or solid state relay between my battery and motor so that I can use a simple toggle switch to turn on/off the battery. Longer term, the bms could disable the battery, or I could even select between battery banks.
But for now, starting simple with an electrically controlled switch for the battery.
I'm using a 48V system.
Typical max operating current may be as low as 20A, but could get spikes up to 50A.
I've looked at DC solid state relays. And even found some rated up to 48V. The problem is that when you read the fine print and reviews - even the 100A SSR's are not rated for anywhere near that amount of current for constant usage. (arrrgh!!)
I then started looking at "contactors", and eventually ended up looking at 48V golf cart solenoids.
I've always thought of a "solenoid" in this case as being a really big relay. It looks like the 48V golf cart solenoids should work for this application:
(Note - I'm on fresh water, and the solenoid would be in a plastic case - so I'm not worried about corrosion.)
Is that what I'm looking for, or do I need something that's more "heavy duty"?
I saw references to using a flyback diode on the control contacts - and that seemed like a good idea. Anything else I need to know?
Thanks!
John
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