240v inverters are expensive (I know batts and panels are also expensive), so I was considering if it was possible (apart from being *extremely dangerous*)to have 2 banks of 18 x 12v batts so I have a DC supply of 240-0-240. Could cheaply test design using 9v batt to begin with. Then perhaps a AB amplifier driven with a 50hz sine wave to power a 250vac 5 amp load. (If you think I have NOT thought about it in-depth then you might be right) Not too familiar with amplifier design but think it would also make an excellent power supply for a massive power audio amp. I was considered that transistors don't handle such high voltage rails but then they must use some sort of transistor on the output of inverters. Is this line of thought way off. Justin -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.