Originally Posted By: Tjin

When i was working for the fire department, they had heaters designed to run on diesel and a small electric fan on a secondary battery. They would run all winter long in emergency vehicles that where not parked in a garage.


Of course - a secondary battery is the obvious solution.

I am pretty sure that the limit of 60 minutes operating time on Webasto's web site is to prevent the primary battery from being drained. Without this limit, lots and lots of Webasto customers would find their car battery depleted half through the winter. It doesn't help if the car is warm inside if the engine won't start. Such incidents would be bad for Webasto business. Doesn't apply for our scenario, though.