Power system with an add-on power module

A power conversion system comprising:

• a main power source configured to deliver drive power to a main power system, wherein the main power source comprises a lead acid battery, a DC/AC inverter, and a non-isolated DC/DC converter connected in series with the DC/AC inverter, wherein the lead acid battery is disposed upstream of the non-isolated DC/DC converter;
• an add-on power module comprising an isolated DC/DC converter and a low voltage source coupled in series with a high voltage source;
• wherein the add-on power module is coupled to the main power source and configured to output boost power to the main power source;
• and wherein the high voltage source is connected to a first port of the isolated DC/DC converter and the low voltage source is connected to a second port of the isolated DC/DC converter, wherein the add-on power module is disposed upstream of the non-isolated DC/DC converter and in parallel to the lead acid battery, wherein a first circuit connection electrically couples the lead acid battery to the low voltage source and a second circuit connection electrically couples the lead acid battery to the high voltage source;
• and
• a controller coupled to the main power source and the add-on power module, wherein the controller is configured to:
• determine that the main power system requires power from the main power source, and if so, direct boost power from the add-on power module to the main power source, wherein the boost power is then directed to the main power system from the main power source;
• and
• direct drive power from the main power source to the main power system when boost power falls below a predetermined threshold.