I think a refrigerator powered by plutonium cells would be a nice addition. Maybe have a variant of the FoodCo Kitchen Buddy that takes UPS charge or plutonium cells. It would be great for food preservation, assuming you have a good supply of power cells.
How is this any different from a normal fridge? Seriously, how? At first I thought you were suggesting something along the lines of the Atomic Coffee Maker where it wouldn’t take up energy but would have some other downside that’d make it unwieldy for a mobile vehicle (such as making it actual furniture).
“Finally! After all these years! I created a device that can freeze the S H * T out of stuff faster than a normal fridge! All it needs is the power of 1000 gerbils running in a windpipe…”