I was charged with the duty to report back on the performance of my RoadPro 12v heater. Since Chicago is well into winter I have some things to say about it. Late in the Autumn I used my RoadPro more as test runs to see how it would do. Temps ranged from ranged from 45F to 32F. I tried several different combination in this time period. I tried just RoadPro no heated seat and no car heat. The Road pro kept me a little bit warm but not completely comfortable. I tried it with the electric seat and found that my feet were a little cold but all else fine. I then tried it with the RoadPro actually down by my feet on the driver side and it warmed my feet fine. But there is not much room down there for the big heater box. But the best in late Autumn was to warm the cabin up with the car heater and then turn it off and maintain with the electric seat warmer and the RoadPro. Great for Autumn.
Next it has been winter weather 32F to 18F. Here the car heater needs to be employed to warm the cabin along with the seat warmer. I turn it on for 5 mins and off for 10 mins. The RoadPro certainly slows down the cabin cooling. Were I not using the RoadPro it would very quickly get cold. Does it heat the car up by itself? Certainly not but it is definitely extending the range of the car because I can have the heat off 2/3 of the time.
Today it was 0 degrees out. I did not drive my Imiev to word. I chickened out
I feel that in this very low temp, I would need to run the heat the whole time. my drive to work is 30 miles and so with 100% heat on I would be close to complete battery use. I will wait for slightly warmer temps later this week and see how it does in the 10F to 18F weather.
Over all I think the idea of the isolated 12v battery pack just for the 12v heater extends the range by 5 to 12 miles in Winter.