EB40 connector type

I am trying to find a way to charge my EB40 from my solar panels which use Anderson. Does anybody know the exact type of connection for putting power into it? It doesn’t match anything else I have. Thanks!

It is not 5.5 * 2.5 or 5.5 * 2.1 unfortunately as I have both of those to try. It is something else altogether I haven’t seen before.

The manual in the Bluetti website says it is a 6530 connector. You can also get an anderson to MC4 with the correct polarity and connect that cable to your solar panels and the other end to the MC4 charging cable that came with the EB40