Another owner (Mollysdad) and I have been working together to come up with a way to mount the switch external to the battery box in a plastic connection box mounted to the battery box. The advantage of this method is that it does not take up any room in the battery box enabling you to fill that box with the biggest batteries you can fit in there. It also makes it easier to maintain flooded cells with water. The switches are for marine use, so they are waterproof. I agree that Blue Sea is the gold standard. I'm using the 6007 model which is small and provides for being able to disconnect both the airstream and inverter separately.
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