As far as the order of hooking up the Adjustable voltage power supply, I almost always plug my meanwell rsp-500-15 in to 115VAc, adjust the voltage, then connect my Anderson powerpoles completing the DC circuit to the battery. I do not disconnect it from 115Vac, then hook to battery, then back to 115Vac.
I've been doing it this way since October of 2014.
I've also disconnected it from AC while it was still charging or just supporting DC loads, many many times, but generally try not to.
Basically I try to limit the connecting and disconnecting of connectors and turning things on and off.
My 3600 degree potentiometer for voltage adjustment has a turns counter. I could in theory equate a certain voltage with the amount of turns counted, but instead just spin it at will. Only if the battery is well depleted will a 14.7v unloaded setpoint measured at the power supply, drop below 13, and only for 10 seconds or less as the battery sucks up 40 amps, and my DC circuit could certainly have less resistance at 40 amps.
