Michigan doesn't get that cold that often (maybe the UP does). Think Minnesota or Finland. And the point isn't that it already covers 100 million, just that if

Michigan doesn't get that cold that often (maybe the UP does). Think Minnesota or Finland. And the point isn't that it already covers 100 million, just that if there's a need (like there is for warming cold engine blocks in winter), it's neither particularly complicated nor expensive to provide this kind of overnight trickle charging.