Sid Genetry Solar Posted December 31, 2021 Share Posted December 31, 2021 11 hours ago, Paul said: That's an ASL4. If my ASL3 can survive a sustained 3.5kW (albeit with very flattened peaks on the sine wave) then I would expect the ASL4 to survive 5kW or more sustained power with the cooling fan running correctly. Most devices are not affected by the flattened peaks on the sine wave except some old microwave ovens and cheap Chinese LED lighting controllers. I would expect yours to produce a near-perfect sine wave up to about 2kW. Sid probably has more experience of what each transformer size can cope with than I do though :). I'm still learning more about how transformers function...workin' on that 12kw transformer, trying to figure out how to get a design that will do 12kw without overheating, without going to a bigger core, etc., etc. At least as far as I'm aware at the moment, the transformer core does not actually handle electrical power, but rather a magnetic field. (As such, core losses are best measured at no load.) The #1 limitation for how much power a core can handle seems thus far to be how much wire it is possible to get wrapped around it. Too little wire = too much heat and/or excessive losses. The bigger the core, the more magnetic flux it can store--and also due to the increased surface area, the more magnetic flux can be transferred to the windings (resulting in a higher volts/turn). The higher the volts/turn, the less wire required to reach the desired voltage (to a point, obviously!)--and the less wire required, the lower the losses, etc., etc. I'm not too familiar with what the PJ-spec transformers using the ASL3 / ASL4 cores are capable of--but I do know that the ASL3 and ASL4 cores are basically the same size +/- 10mm. In other words...a very minimal difference between the 2. Quote Link to comment Share on other sites More sharing options...
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