Hybrid hydrogen power module

A method for retrofitting an integrated power module into an ultra heavy-duty truck, the integrated power module including a plurality of hydrogen fuel cell modules coupled to and supported by a skid, a plurality of battery sub packs coupled to and supported by the skid, and integrated power electronics physically coupled to and supported by the skid and electrically coupled to each of the plurality of hydrogen fuel cell modules and the plurality of battery sub packs, the method comprising:

• electrically disconnecting a diesel generator from an electrical drive train of the ultra heavy-duty truck;
• physically removing the diesel generator from a structural interface after electrically disconnecting the diesel generator;
• physically coupling the skid to the structural interface of the ultra heavy-duty truck such that the integrated power module resides within volumetric and configurational constraints of the diesel generator;
• and
• electrically coupling the integrated power electronics to the electrical drive train of the ultra heavy-duty truck.