Direct current fast charger system with low standby power

A battery charging system, comprising:

• a voltage input;
• direct loads configured to be coupled to the voltage input;
• one or more secondary power supplies coupled to the voltage input and configured to receive the voltage input and output a voltage lower than the voltage input;
• indirect loads configured to be coupled to the one or more secondary power supplies;
• a switch disposed between the voltage input and the direct loads, the one or more secondary power supplies, and the indirect loads;
• a control circuit directly or indirectly coupled to the switch;
• and
• a communications circuit directly or indirectly coupled to the switch;
• wherein the control circuit and the communications circuit are configured to control the switch to selectively disconnect certain of the direct loads, the one or more secondary power supplies, and the indirect loads from the voltage input when the battery charging system is in a standby mode.

A battery charging method, comprising:

• selectively disconnecting certain indirect loads from one or more secondary power supplies coupled to a voltage input and configured to receive the voltage input and output a voltage lower than the voltage input when the battery charging system is in a standby mode;
• wherein direct loads are also coupled to the voltage input;
• and
• wherein the certain indirect loads are selectively disconnected from the one or more secondary power supplies using a switch disposed between the indirect loads and the one or more secondary power supplies, a control circuit directly or indirectly coupled to the switch, and a communications circuit directly or indirectly coupled to the switch.