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A few of my threads about battery charging have ended here... I think this is the...

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A few of my threads about battery charging have ended here... I think this is the...

Old 06-14-2019, 11:57 AM
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Default A few of my threads about battery charging have ended here... I think this is the...

...last question.

I have a battery that I want to "disconnect" from the bank while it is charging.

Here's what I'm after.

Battery "X" is a battery in the house bank. When that I turn on the on-board charger I would like that battery to be disconnect from the bank (while it is being charged) and then, once it is charged, it reconnects. I *think* there's a relay that does it... but I'm not certain.
Thanks,
Pete
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Old 06-14-2019, 11:57 AM
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Ah crap... this should be in the main boating forum. Duh.
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Old 06-14-2019, 12:12 PM
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Simple way would be a traditional 1-2-both-off switch, with your house loads and both ACR’s on the output side of that switch. Run in both unless you have a battery failure in the bank, and you will then have the option to run in either battery by itself. Turn to off for charging. If you forget to turn it off, they will still charge, just not isolated from one another.

I cant think of any simple/inexpensive relay to do this. Any such relay would need to be able to at a minimum carry 50% of your house bank loads in use.
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Old 06-14-2019, 12:15 PM
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Actually, it would be a simple on/off switch. The battery is in the bank when the switch is 'on'. The charger lead would be on the battery. The part about this that sucks is that there is room for error if you forget to turn off the switch and then turn on the charger.

I know that there's a relay that does this... but I don't know which one... Going to reach out to BlueSea...
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Old 06-14-2019, 12:26 PM
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Originally Posted by OldPete View Post
Actually, it would be a simple on/off switch. The battery is in the bank when the switch is 'on'. The charger lead would be on the battery. The part about this that sucks is that there is room for error if you forget to turn off the switch and then turn on the charger.

I know that there's a relay that does this... but I don't know which one... Going to reach out to BlueSea...
could definitely do it with an on/off switch rather than a 1-2-both-off. Very little difference in wiring/cost. Main difference is the inability to run on one of the two if you have one take a crap.
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Old 06-14-2019, 12:37 PM
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Blue Seas make a remote/manual switch, Model 7700. The remote switch is small.

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Old 06-14-2019, 12:39 PM
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Well, I know how you could do it, but I'm not sure it's worth it.

You'd get the blue seas switch 7701 which is a remote switch (capable of up to 500A) and connect it to both batteries. There's a manual push button remote switch that toggles it "on" or "off", so you'd be susceptible to the error above. You could use a couple of voltage sensing switches to replace the push button and automate it too.
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