I had a setup with a completely full high voltage battery and a completely empty low voltage battery but the low voltage battery did not start to fill at 52 kw like it should've.
The power also possibly has a problem where when using junctions instead to have it constantly flow into the low voltage battery it does not fill at 52 kw until it is full. out of my knowledge it should always fill at 52 kw until it is full because the amperage and voltage of the high voltage battery is so much higher (I might be wrong on this though)