Although this is a very powerful power supply, it cannot be used with 12 volt individual DC chargers. I have three different DC chargers (Great Planes, and Hobbico) and neither one of them will work off of this power supply. I get the same error message........too much voltage. A switch or dial to control the voltage would have helped greatly. I have a multi charger and will attempt to use it there. If I get the same warning error and it does not work there,..............does anybody want to purchase mine??