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by angry_octet 3 hours ago
800W peak * 3 is only 2400W which is fine, it's very unlikely to be pumping out that for long. Now if you put in 6 of them you will have problems, but this is the same problem as people plugging in multiple loads, and circuit breakers handle this fine in practice.

Perhaps the bigger risk is a mix of loads and supplies on the same circuit, which could result in large currents on runs without a circuit breaker. Cheap extension cords are are possible problem too.

Arguably the plug in PV should have to talk to a house bus controller, which controls generation and loads. Unfortunately the standardisation process is impossible.