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If you install the disconnect on the positive side and open the circuit, the negative is still connected to ground and if you accidentally short the positive terminal of the battery to the frame, or other conductive item that is also grounded, you will be doing a little bit of undesired arc-welding.
If you install the disconnect on the negative side and open the circuit, as long as the converter is not powered by being plugged in to shore power or otherwise energized, you can short the positive terminal of the battery bank to ground as much as you want and nothing will happen because there is no circuit to be made. If the converter is powered up and you short the positive battery terminal, the converter will complete the circuit as it will attempt to charge the battery.
Pick your poison.
Myself, I would choose the negative side. But you must be aware of the powered up converter scenario. I guess the "almost idiot-proof" way would be to put one on each side of the battery bank and totally isolate them.
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