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If it is already struggling at 50%, which would be 1200w, then doing the on-off trick to pre warm the elements is very unlikely to work for the 100%.

The hunting and surging at 50% informs what...

Does your heater have just the two settings?

When you say the Generator packs a sad, what is the specific nature of the tantrum? Does it trip its breaker but the motor continues running?, or does the motor stall? Or does the generator just...