Hi, I have a situation where the existing 48Vdc system is a positive grounded (-48 or negative hotwire), now I need to replace it with a new 48Vdc charger that is earth ground isolated and its output is already negative volts (positive to ground=0V & negative to ground=0V and positive to negative potential is negative 53V)
At the DC combiner panel, positive busbar was grounded and that is where we will connect in order to parallel the new system to avoid loss of dc when removing the old system.
I understand that both system outputs have different polarity hence I cannot just simply parallel them (positive grounded system does not cause polarity to change) . How do I safely remove the old system without interrupting the loads and not to loss the 48Vdc?
