running two chargers

Harvard wrote:
I would not do it unless I knew there was some diode auctioneering in the circuits. Diode auctioneering is where one charger will not effect the other charger AND the hardest working charger will "win the auction".

Never heard of that. In the above photo, later on during the recharge the three Vector chargers tapered their amps while the 40 amper stayed at 40.4. That one has a voltage of 14.8 while the Vectors have 14.6. Once the 40 amper was the only one left charging, its amps started to taper until it was finished.

The lower voltage charger is not knocked out by the higher voltage charger right off. It is all about the comparative "spreads" between their charging voltages and the battery voltage. With enough spread even the lower voltage charger does its full amps.

Once the battery comes up in its voltage, the spread for the lower voltage charger gets too small for full amps and those amps taper till no spread and no amps. Meanwhile the higher voltage charger may (or may not) still have enough spread to do its full amps. If not, its amps will also taper but not as much as the lower voltage charger's amps are tapering, so the higher voltage charger does indeed end up being the last one to finish.

Another thing is that once total amps taper to where not all the chargers are needed to make that many, you can pull a charger and nothing happens except the remaining chargers' amps jump back up to meet the battery acceptance at the time.

I have observed all this "action" many times. I usually just leave them all connected until it is over (50-90 at 90) but if I am in a hurry to put stuff away I will pull chargers as they become redundant.