Hopefully? Another 48vdc-240vac Toriod Inverter build.

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KeepIS Guru Joined: 13/10/2014 Location: Australia Posts: 1860	Posted: 10:30am 26 May 2023         wiseguy said   Can you please describe the operation of the auto inverter / 240V mains input switching that you have incorporated (if previously described a pointer is fine). I understand it auto switches as required back and forth ? The Auto operation is as follows: There is an ATS - automatic transfer switch on the Solar wall. It switches to Inverter input when it senses a voltage greater than 53V (adjustable) on it's Control Line. The ATS is dumb: It will switch to Solar even if the Inverter has no AC output. It will switch back to mains even if there is no Mains AC.     I modded it: I have an external switch on the Solar wall that is for Solar Priority or Mains priority, it also provides 24VDC from a tiny transformer to indicate Mains AC present or not. In Mains priority, if there is Mains 240vac the tiny transformer in the box with the priority switch enables a 24v relay in the Inverter top deck, which keeps the inverter off when the inverter is in Auto position. If mains drops and the Inverter is set to Auto: The Mains powered 24V relay in the inverter Auto control opens, switching the inverter ON/OFF control to ON. The inverter starts as normal, The Capacitors are automatically charged and the inverter soft starts as normal. When the inverter AC output reaches over 200VAC, sensed by a 240v to 24v toriod transformer in the inverter, another relay is enabled and this sends 54 volts to the ATS control line. The ATS has a 1.5 delay on its control line (under voltage verify) before switching to inverter power. This setup seamlessly switches back and forward, turning the inverter off and on as needed, but only if I set it to Auto. If set to Solar priority: The inverter switches on and stays running until manually switched off, or Inverter AC output drops or the DC control voltage drops for any reason, then it switches back to mains AC supply instantly, regardless of the Mains AC status.. It has worked faultlessly on the previous HF inverter, and in this inverter with the China Driver and obviously works perfectly with your Driver and Power board, after all it is independent of the Driver & Control board.     Getting tired, heading off for a cuppa and an early night, so I hope that makes sense. Edit: Made this post a bit clearer then it was before I quit last night, at least I think I did.   BTW I only noticed your post after I had posted the Choke startup difference I had been thinking about.   . Edited 2023-05-27 05:52 by KeepIS