Yuluoxk I finally have an answer, thanks to C for helping me understand. After watching all the disassembly videos, it seems that this inverter has a major problem, as all the shielding methods are ineffective. Now I know that using a private protocol bypass is no longer possible.
There's a blogger on B站 who has managed to crack the 12V protocol, but simply specifying the current isn't enough. I have contacted DJI technical support multiple times, and it seems that achieving the required 42V sdc current is only possible when charging directly from the battery pack using mains power. Therefore, cracking the current appears unlikely.
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