D
Deleted member 4366
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C12 is to make minor adjustments to the LVC.Yes I've noted the minimum voltage setting on the LCD3 but it won't reduce it enough to compensate for a 48V battery. I seem to remember the minimum being -2V which would be 48V for my controller.
The same 18FET controller is used for 36/48V though, so it's probably a jumper as you say, something to investigate in time.
The LCD3 is normally fully automatic between 24, 36 and 48v. I'm sure I've seen some marked as 36v, 48v and 60V, but I've also some marked as just 60v. Whatever the situation, I think it's only the LCD that deals with voltage control, so in the worst case, that's probably all you need to change.