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BrianG · 03.11.2007, 06:15 PM

OK, first of all, the "volts<10.5" error probably meant the 12v power supply dipped to under 10.5v. Trying to charge two 5s1p at 4A can require almost 200W on the power supply (including charger losses). That's at least 16A at 12v - but since the voltage was dropping to 10.5v, the current was higher at about 19A. Sounds like you need a bigger powersupply, or maybe one for each charger.

A 5s pack will charge constant-current mode up to 4.2v/cell, which is 21v. So the battery voltage will steadily increase until the pack gets to 21v. Then, the voltage is "locked" and the current steadily falls until the charge stops. That said, I don't know why the charger is stopping. I would use one charger at a time on the power supply to eliminate input voltage issues.

You don't need a 20v power supply, you need a 12v power supply that can supply about 25A. Or you can just get another one like you have now and run one charger on each power supply.

	(#2)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	03.11.2007, 06:15 PM OK, first of all, the "volts<10.5" error probably meant the 12v power supply dipped to under 10.5v. Trying to charge two 5s1p at 4A can require almost 200W on the power supply (including charger losses). That's at least 16A at 12v - but since the voltage was dropping to 10.5v, the current was higher at about 19A. Sounds like you need a bigger powersupply, or maybe one for each charger. A 5s pack will charge constant-current mode up to 4.2v/cell, which is 21v. So the battery voltage will steadily increase until the pack gets to 21v. Then, the voltage is "locked" and the current steadily falls until the charge stops. That said, I don't know why the charger is stopping. I would use one charger at a time on the power supply to eliminate input voltage issues. You don't need a 20v power supply, you need a 12v power supply that can supply about 25A. Or you can just get another one like you have now and run one charger on each power supply.