Time for a new Warpinverter build

Author	Message
rogerdw Guru Joined: 22/10/2019 Location: Australia Posts: 955	Posted: 04:33am 14 Mar 2021         renewableMark said   I have had two air cons running basically all day while sun was up, I can't remember top temp, but they have never got to 60c from memory. Yeah, thanks for that. All these comments add to my confidence that the transformers will be perfectly ok  ...  and especially Tony's example where his fan hasn't come on in three years. If it was anyone else I might be wondering if the fan circuit was ok  ...  but that's not something we need to worry about with Tony.     Quote   The way I do mine with the polyurethane, the temp seems to permeate well from the centre, they take a long time to cool down too but that doesn't matter. I wouldn't worry about them getting too hot, prob the last thing to stress about. I had been of two minds with the polyurethane, wondering if blocking off all potential of air permeating the windings was a good thing or not. I suppose it depends on how well it transfers heat or if it holds it in. Either way I can't argue with your results  ...  especially seeing you have those temperature figures and all those operating hours.   Quote   Chinese transformers in Aerosharps!!!!!!! BEWARE. Some I have got were the same, some were different, luckily I have had mostly a good run, but I got two couriered from interstate a while ago, they were both labelled as 3KW so it wasn't the sellers fault, but immediately when I saw them they looked very small. Stripped them down and they were only 2KW cores, so looks like some were fitted with undersize transformers from their crappy QC factories. Had I known that's what they were I never would have bought them or paid the courier fee from interstate. I thought the same thing as you to start with, but I've never stripped a 2kW transformer to know what the actual size of a core is.  Can you tell me the dimensions of a stripped 2kW core?