Been looking at Thermoelectric generators. Would be nice to have the valve cover pans and oil pans on the engine generating the electric power for charging the battery in the electrical system.
https://www.tegmart.com/thermoelectric-modules/22w-teg-module
https://en.wikipedia.org/wiki/Thermoelectric_generator
https://www.tegmart.com/thermoelectric-modules/22w-teg-module
https://en.wikipedia.org/wiki/Thermoelectric_generator