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Thanks for all the insights. It sounds pretty clear these switches are not sufficient for my use case. My reasoning for switching the inverter on/off using these switches was to have a single power button for the system. It's a 12V system with 100A draw.

I've eight 272Ah LiFePO4 cells on order through Michael B Caro's group by so battery talk is not completely tangential. That said, I still wouldn't DIY a power bank for cost savings - just for fun + emergency power :) I wonder if the future is neighborhood power banks. In central Texas, we're...