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

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Murphy's friend Guru Joined: 04/10/2019 Location: Australia Posts: 671	Posted: 08:04am 01 Jan 2023         KeepIS said   Thanks for the information. As I won't be using GTI back charging that is one less thing to deal with. The power bank is 25kW of LiFePO4 Dual BMS batteries with equalizers.   I would like to go to with 4 power boards, much cleaner build and optimizes the heat sink and layout. But there is that problem of getting boards. I have full workshop drill press and taps, been designing and building electronic equipment since my early teens so not a problem from the construction point of view. I only have one Aerosharp heat sink, but have four of the big SMA units (almost as big), and one huge heat sink that makes the Aerosharp look positively tiny Power wise I need to handle up to 15kW for a few seconds, maybe 3kW to 4kW 5% of the time and <1kW 95% of the time. FYI, My inverters use 2 power boards (2 half bridges), 2 half bridge driver boards and suitable mosfet carrier boards for easy replacement of them. Have a close look at my pictures. There is one control board holding the nano and battery management parts plus VFB & IFB input. I use a little PCB for the VFB transformer/ rectifier and current sensor/ rectifier. One full 3KW Aerosharp heatsink cut in half will do for your load, coupled with a 120mm fan. I use Ebay temperature control relays, not the nano, to control the fan as Poida & others do.