I know some people use a clock to reset the circuit once a cycle, and while that's fine, this has the drawback of forcing the shutoffs into a certain configuration for 2 seconds. This might cause a power interruption if the cycling occurs at the wrong time; not to mention the fact that if you're feeding a highly loaded circuit from the battery pair, this power interruption is certain to occur; with > 10kW load, your batteries cycle faster than 2 seconds. So I came up with this. It's not