Integrated power system

A power system comprising:

• a chassis configured to house a first board, a second board, and a third board, the first board, the second board, and the third board being electrically coupled to one another, wherein:
• the first board is configured to receive power and to output power at a first voltage and a second voltage;
• the second board is configured to receive power from the first board or at least one internal battery electrically coupled to the second board and to output power using at least two voltages;
• the third board is configured to receive power from the second board and to output power at two voltages;
• each of the first board, the second board, and the third board includes one or more converters configured to convert the received power into the respective output power;
• and
• the one or more converters are thermally interfaced with one or more portions of the chassis so as to conduct heat into a respective portion of the chassis.