Hi Nigel: Yeah, I did not give any info, SORRY. I'm trying to make an "inverter" but not for mains replacement. I'm looking at the electronics part of a joint effort to produce HHO gas. The idea is to use 12V DC in a vehicle, "invert" to a Sin wave, stepup voltage and half-wave rectify the final output to retain the "pseudo pulses". A fair bit of energy is required to make any meaninfull gas volumes so I would need some hefty input for a decent wattage output. The more voltage, the lower the output amps across more plates in the electrolysis reactor cell. I don't want to discuss HHO gas here, I'm the electronics maker in this joint effort but don't have a lot of experience, thus the question. Does this help more ?