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Old 10-11-2019, 09:09 AM   #481
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Originally Posted by brokedown View Post
I'm currently using a marine battery bank switch to manually control a connection between banks, but I have been planning to replace it with an esp32, voltage sensors, and a big solenoid to connect them automatically in the future. My experience is also that solenoids fail open.

I know you know this Josh but for the OP's info:

If you are switching between two battery banks using a single charge controller you may want to make sure that your battery switch is "make before break" .

A "break before make" variety will leave your charge controller without battery while your your panels are still connected. This can make your charge controller very unhappy.
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Old 10-11-2019, 09:40 AM   #482
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Marine switches are pretty universally make before break. Pretty much any switch that goes in order 1 - All - 2 - Off will be. It's just a lot easier to make them that way, they are very primitive devices!
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Old 10-11-2019, 09:58 AM   #483
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Join Date: May 2016
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Engine: Cummins ISC (8.3)
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Originally Posted by brokedown View Post
Marine switches are pretty universally make before break. Pretty much any switch that goes in order 1 - All - 2 - Off will be. It's just a lot easier to make them that way, they are very primitive devices!
Yup. Just wanted to forwarn the OP that there is a right one and a wrong one. I replaced one for a gent a few months ago.

He had an RV dealership install one and his charge controller started going nuts. Charge controller was loosing battery for a moment when he switched. Panels remained connected.
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