Power Supply System For a Vehicle Climate Control Unit

A truck, comprising:

• an engine;
• an alternator driven by the engine;
• a starter motor for starting the engine;
• a combined inverter and charger unit having an alternating current electrical power output;
• a day cab forming an interior space;
• a climate control unit for conditioning the interior space of the day cab,
• wherein the climate control unit is adapted to be powered by an alternating current electrical source, and
• wherein the climate control unit is powered by the alternator through the combined inverter and charger unit when the engine is running;
• and
• a battery for supplying electrical energy to the starter motor,
• wherein the combined inverter and charger unit configured to charge the battery, and
• wherein said battery supplies electrical energy to the climate control unit through the combined inverter and charger unit to power the climate control unit when the engine is not running.

A method of modifying a truck, comprising the steps of:

• providing the truck, the truck including:
• an alternator having a direct current electrical power output;
• a house battery;
• a starting battery;
• a day cab forming an interior space;
• and
• a heating system for heating the interior space of the day cab;
• installing a combined inverter and charger unit on the truck with an alternating current electrical power output;
• and
• installing an auxiliary HVAC unit on the truck,
• wherein the auxiliary HVAC unit is adapted to be powered by an alternating current electrical source;
• and
• wherein the auxiliary HVAC unit is powered by the house battery or the starting battery through the combined inverter and charger unit when an engine of the truck is not running.