Maxxfan does not actually have a conversion kit like Dometic # FV807357, so you'd have to swap out your entire manually lifting fan with a 12V powered fan.
I recommend checking out the MaxxFan Plus Roof Vent w/ 12V Fan, Thermostat, and Remote # MA00-04500K.
This fan has a 12V fan that can be operated with a remote, a rain sensor that automatically closes the lid when rain is detected, and also includes a bug screen to keep bugs and insects out. view full answer...
If you have a Fan-Tastic 730 series fan, you can actually just use the:
-Fan-Tastic Vent 7350 Series Upgrade Kit - High/Low Style Base # FV807359.
This upgrade kit will upgrade your Fan-Tastic fan to a motorized setup. This kit also features a 2 wire design, a wall holder with 2 AA batteries, and the necessary hardware for installation.
Alternatively, if you do not have compatible fan for the upgrade kit, then your best option is to replace the entire assembly with the:
-Fan-Tastic... view full answer...