Interesting where you seeing that, is that with a battery, how comes you can only go to 250w? I thought bafang for cargo was supposed to be 500w. I'm not speaking from experience here tho.
Amazon and à few others but actually you're right, with battery it seems to be around 550.
The road legal limit is 250w, I looked to see if there was a difference for cargo bikes but I can't find anything, I'm clueless about it so happy to be told otherwise.
The 250w is around 400 from what I've seen, I thought you couldn't put more than a 250w on?