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Forum Index : Solar : Battery Isolator

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Godoh
Guru

Joined: 26/09/2020
Location: Australia
Posts: 672

Posted: 06:16am 08 Jul 2026

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I am setting up a dual battery system on our solar.
I have a switch that I can switch manually between banks but am wondering if anyone has a simple way to charge both banks while they remain isolated from each other.

I have seen commercial battery isolators but the diagrams show a separate alternator input into the isolator and then FETS to feed the power to both banks

I can't easily isolate the solar inputs from the main battery as I also backfeed through two GTI inverters as well.

I am under the weather a bit with RSV at the moment and my brain is fuzzy and not working too well.

I have two Kilovacs that I can use, but am wondering about using a diode or a FET. To keep the batteries isolated.

Ideally I want both banks to be charged and to be able to switch between banks manually when the weather is not so good for solar inputs.

Cheers
Pete

Solar Mike
Guru

Joined: 08/02/2015
Location: New Zealand
Posts: 1225

Posted: 11:52am 08 Jul 2026

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Do you want to have one bank connected to your inverter on load, with the other connected to your PV; then flip them over when the 2nd bank is fully charged.

Perhaps a simple drawing is in order to visualize requirement.

Cheers
Mike

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