BMW i3 3-phase charging 'logic'

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alexsas
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Joined: Mon Jul 24, 2023 8:37 pm

BMW i3 3-phase charging 'logic'

Post by alexsas »

Dear friends,

I have an i3 that recently stopped working with 3-phase chargers properly.

It limits itself to 3.7kw with no warnings - so it seems to me it tells the EVSE that it will happily accept 3.7kw on 3 phases - and the charger seems to be happily providing that, but somewhere inside the i3's "brains" it is not "connecting" the remaining two phases, and just sits at 3.7kw.

When I connect it to a 32ah single-phase connector, it works absolutely fine, I assume using both KLE "phase" and EME's "phase" and pulling full 7.4kw.

so the problem is only limited to 3-phase mode - if that makes sense.

I have tried reading online everything I could find, but I am struggling to understand what is the most likely faulty part - KLE, LIM or EME as they all seem to do 'something' when controlling this process. I also have a very small hope that maybe I could get away with resetting some sort of circuit breaker but I somehow don't think so.

My current prime suspect is the KLE - but before I spent a few hundred £££ to try, maybe someone has an idea what else I can look at?

Thank you all in advance!
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