Builiding of a complete 6kW PV inverter with MPPT chargers

Author	Message
Murphy's friend Guru Joined: 04/10/2019 Location: Australia Posts: 671	Posted: 01:39pm 19 Mar 2024         rogerdw said     Murphy's friend said   I now have inserted a permanent split PVC tube clamp  inside and a varnished rope wrap outside. This still allows good cooling while preventing wire  hum. I missed this point earlier Klaus  ...  are you saying that you did this INSTEAD of epoxying the windings  ...  or IN ADDITION TO? Instead Roger, instead of epoxy. Epoxy is a  pain if one decides to unwind that toroid but it works well for a *definitely* permanent wind. For re cycling my big toroid from the warpverter (as used in my latest inverter) I had to unwind the primary (too many turns) and while only the hole portion was epoxied it took many passes of my wire straightener to rid that 7 strand enameled wire of the epoxy remnants. You can see the inserted split PVC tube in one of my recently posted inverter tinkering pictures. On the outside I wind soft natural fiber rope which tightly constricts the windings there. That rope is then just varnished and could easily be removed if I need to change turns. Winding that rope is easy with the transformer on a turntable (as used in cake decorating).