Hi, I'm from G20 forum, my car is 48v so I have your same problem.
I used a multimeter to monitor the voltage during trickle charge and discovered that, instead of having steady and stable voltage during phase 3, it periodically drops under 13 volts, and that happens just before/after I hear the noises of the various control units restarting.
In my opinion the problem is not the charger that doesn't deliver enough power but some kind of circuit protection :/
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