Wanted: Source for 8-10Kw toroid cores.

Author	Message
Murphy's friend Guru Joined: 04/10/2019 Location: Australia Posts: 673	Posted: 07:50am 22 Feb 2024         Godoh said   I will be winding my transformer with 2 in hand secondary, possibly 2 x 2.5mm wires. Depends on what wire I can source in Launceston. Cheers Pete A tip for you Pete, it will cost you nothing but could be appreciated further down the track I know you have a 24V system (you might regret when you see what long time currents a 3.6KW car charging load drag from your battery ) but my suggestion is: wind the Primary of your toroidal transformer *also* as two parallel windings. That way you could later easiy connect them in series for a 48V primary. Have fun with the winding, it only looks confusing the first time and is a piece of cake after the 6th toroid      like I know by now. Just think it through first, ideally the layers of parallel windings should go completely around the core to evenly distribute the field. You might consider to keep the primary/secondary start/ finish a bit apart so its easier to connect later when its finished. Do measure the magnetising current after you wound the secondary (it might need a startup load if you do not have a variac). When the primary is on measure that current again, it should be identical to confirm there is no short. Tell us your initial magnetising current and the core size so we know you are in the right ball park.