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According to the national electric code a continuous load (>3hrs) cannot exceed 80% oh the circuit rating.

For a 40 amp circuit with a continuous load the load should not be more than 80% of the circuit rating (32amps).

June 28-29 was the annual field day for amateur radio. Stations are operated on emergency power for a period of 24 hours making as many contacts as possible across the world on the amateur radio frequency bands. Here are some photos of a 3 station operation powered by my lightning.