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A 30A twist lock that only has 3 prongs is a 120V service.
A twist lock that has 4 prongs is a 240V service.
Although it could be adapted to work, you would only be able to power 1 side of the indoor panel.
3500W is not much power. It would run a few lights, and a microwave or window A/C unit, but that is about it.
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