A manual switch doesn’t solve the problem: there still needs to be a way to inform the inverter that the switch is open.
It solves my problem just fine - power critical loads for a few days by spending $100 upfront fir the cable and 5 minutes to manually switch the load. It’s a difference between moving to a hotel for indefinite time and staying put.
Sure you can set a loftier goal and spend tens of thousands of dollars and countless hours solving it. Most people won’t though.
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