It's going to have to get pretty cold outside to chill the batteries down to 32* in the generator compartment if the rest of the rv is being used and warm.
Our Solitude has 4 100AH lithium batteries in a plastic storage box. Right now the batteries are at 52*F according to the temp sensor of the battery monitor. It's 57* in the water connection area and 44* outside. We are at the Oregon Coast ( at Hort Stevens Historic Area as camp hosts ) and it's been windy ( 10 -15 mph plus ).
View attachment 494336
The batteries stay close to 50* most of the time.
KEN