do you have an ACR in there that you're not telling us about?
Not an ACR that simply connects two banks, but a more specialized combining device that only allows charging in one direction. My whole point is that (I think, my whole Q is simply asking for confirmation of this intuition) this switch layout can control the direction of that flow.
You are not going to charge one battery by connecting it to another battery.
Why not? Let's replace the word "charge" above with "allow current to flow". If bank1 has a higher voltage than bank2 and the two are connected, for example by a Balmar (ex-Heart) Echo Charger, my understanding is current will flow from the former to the latter until their resting voltage is equalized. Is that not the case?
Other DC-DC solutions that are "one-way" and work like this include Balmar's Digital Duo, intelligent battery-to-battery chargers, for example Sterling or Mastervolt..., and Power-Gate battery isolators from PerfectSwitch.
Now of course several of these devices only combine when they sense a multi-amp charging source active on the source bank. Others can be keyed to ignition or a manual control switch.
But some simply combine when they detect a voltage higher than a setpoint, and isolate when it drops. But that's beyond the issue at hand.
Are you saying you want to reverse the direction the pump is flowing? THAT is what we've been telling you.
The original discussion is about wiring a DPDT switch in order to reverse polarity, in effect swapping + and - wires more easily than doing so physically.
Same sort of thing is done with golf cart forward-reverse controls.
I am asking for confirmation that the same schematic will allow for swapping around the two positive leads of (for example) an Echo Charger. One wire, usually from the Primary/House bank receiving charge input, is "IN". The other, usually to a smaller Reserve/Starter with no other charge source, is "OUT". The third is to common ground and does not get switched.
So using a suitably sized DPDT switch or solenoid/relay should enable remotely "turning around" the directional flow of such a device, in position1 current is allowed to flow from bank1 to bank2, in position2 from b2 to b1, off means no combining.