I thought forum members might be interested in this.
It is really all 'Oztules' work, with his hard testing and pushing the boundries.
This amended Control board sorts out the problem of Earthing issues, impedance, with some domestic buildings, by fitting a isolation transformer, 220vac to 12vac 3w, for the voltage sense. And a few amendments for better sensitivity of the AC voltage adjustment.
At present this OzControl Board No8 will hold onto the ON/OFF that uses the 8010 chip Over Temperature system as it works well. Big toroid transformers require a start stop that is very particular.
http://www.echorenovate.com/new-book--make-a-6kw-inverter.php