Inverter poor AC voltage regulation

Author	Message
Murphy's friend Guru Joined: 04/10/2019 Location: Australia Posts: 678	Posted: 08:59am 03 Nov 2024       This is with my spare 6Kw inverter I am presently experimenting with. When I spotted wiseguys neat AC voltage regulation idea I had to try that . That little 1:1 voltage transformer module would fit neatly directly onto my control board. So I made two almost identical control boards, the difference being that one uses the EG8010 and the other Poida's Nano (with the 'no bessel' program). These boards can easily be swapped about in this inverter. Both boards give a very clean AC wave and the idle power is now only 19W for this 6KW toroid. However, having the AC voltage adjusted to 235V at idle, as soon as I load the inverter the AC voltage drops progressively, as much as down to 210V with a 4KW load (heaters). This voltage drop happens with the EG8010 *and* the Nano board. Here is the EG8010 schematic, voltage feedback is located in the top right corner. Any suggestions as to why that poor regulation are welcome.