Don't need a step up transformer for the full power. Use the
boost/buck style connection with a low voltage (20V) transformer.
Primary across the line, secondary in series with the line.
2.4kW @ 120V is about 20Amps.. so all you need is a 20V 20A
transformer, which is about 400VA. They're a standard electrical
supply house thing, or there's lots of 24VAC out 120V in transformers
around for applications like sprinkler controls, landscape lighting,
low voltage lightning, etc.
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