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

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Revlac Guru Joined: 31/12/2016 Location: Australia Posts: 1130	Posted: 10:46am 25 Dec 2022       Hi Mike, Glad your starting  your build.   Quote   From what I have read on line and almost every forum, the typical High Frequency inverters are not any good at starting heavy inductive loads. I have read that many times and don't really believe it anymore, but more head room is better for the unexpected extremely high surge.   Quote   I assume this HF inverter to be something like a "pure sine wave" 24/48vdc to 240Vac unit with a Hi frequency DC inverter generating around 360v-390v DC feeding a DC to AC PWM IGBT output stage and a large inductive filter for 230v AC. (No big Transformer) The ones I have used are sometimes referred to as AIO (All in one's) and are 48v 5Kw Runs the house no problems, The high voltage DC side is up around 430v last I checked. As far as not having enough power to start things, if kept within the design limits they seem to work ok.   These things use about 50watts Idle current witch is quite high. So the challenge for me to build a good size inverter was to be much less than the 50Watts consumed but the HF inverter, as it turned out it wasn't that difficult to beat that. Also peak efficiency is a bit of a catch, typical house consumption is 300w-500w, best efficiency of the inverter I built was a little over 90% at 2200w. But the Home brew inverter will start some ridiculous loads that I use in the shed and very happy about that in many ways, also the biggest benefit for me is having separate from the house inverter on its own solar and batteries. The capacitors I used are 80v 10000uf Hi Temp NIPPON Chemi-Con and were Cheaper and the same dimensions as the 100v caps at the time. Any way have fun with it, will watch your progress with interest.