From what I understand the size (and thus weight) of a Stirling engine is inversely proportional to the temperature difference it can run off. Running off 10s o

From what I understand the size (and thus weight) of a Stirling engine is inversely proportional to the temperature difference it can run off. Running off 10s of degrees requires a very large engine to have any kind of usable power. Additionally it would at best be a benefit in hot climates where the battery needs cooling. In the cold you want to retain the heat not turn it inefficiently into energy.