DRS 12V 75 Amp 900 Watt Charging Power Supply

This is the power supply you've been looking for. Combined with the iSDT SC-620 charger this setup is a workhouse. In fact you can hook up three chargers to just one power supply and run them all at their max without breaking a sweat. It now includes a 3D printed front guard and optional USB 5V power for charging other devices.