The first problem is that your RDC-30-VO has 2 outputs. One fixed 13.8 and another 1.4 to 8 Volts. The 13.8 volt output is what your chargers need (at least 11v). The other output (1.4-8 volts) isn't enough to run a charger. Only one output on your power supply is enough to power a charger. So even if this power supply was new and working 100%, the variable voltage output wont run a charger even when it is cranked all the way to 8v. This 1.4 to 8 volt output is designed for running a motor for break-in or comm lathes.

Now check the voltage on the 13.8 output. It should be very close to this voltage. If its below 11v, it wont work with the chargers. Most chargers need 11v to work.

Also check on the settings in your chargers for a Low Voltage error and make sure its not set on something too high. I have a 1010c and it is set at 11v. So if my Power supply goes below 11v, i will get an error.

Any power supply will allow you to run as many things as you want as long as you dont go over the rated output capacity of the PS. If you have a 20 amp PS, you can run 20 things on it until you go over 20 amps of load. You just need to know how to correctly attach it to the charger. I use banana plugs which allow me to use 2 chargers on one PS:



You can plug in another set of banana plugs into this set. That way you can run 2 chargers off one power supply. You don't necessarily need two discreet outputs.