No, I don't know the fan size.
Meanwhile, if you insulate the bottom of the car and then don't insulate all that glass, the car is a very effective solar oven. Normal cars heat up because the heat loss through the floor and doors is less than the heat gain through the roof and windows. You've decreased the heat loss through the floor and doors.
You already use a windshield cover. Consider making one for that half-acre rear window. That's a huge solar gain source. The reflective bubble-wrap is probably best, since you don't want anything that will absorb radiant heat and then heat the air inside the car.
This and venting are the only things I can think of that could keep the inside of the car anywhere near ambient air temperature.
And, as you probably already know, opening the doors and hatch for even a few seconds will quickly evacuate built up heat once you get inside. The fan that is already there uses inside air to cool the batteries.
As for air conditioning and the associated loss of gas mileage, consider that cooler air really is good for the batteries (if not for you), and even with the hit to your MPG, you are getting twice the mileage of anything else on the road.
Meanwhile, if you insulate the bottom of the car and then don't insulate all that glass, the car is a very effective solar oven. Normal cars heat up because the heat loss through the floor and doors is less than the heat gain through the roof and windows. You've decreased the heat loss through the floor and doors.
You already use a windshield cover. Consider making one for that half-acre rear window. That's a huge solar gain source. The reflective bubble-wrap is probably best, since you don't want anything that will absorb radiant heat and then heat the air inside the car.
This and venting are the only things I can think of that could keep the inside of the car anywhere near ambient air temperature.
And, as you probably already know, opening the doors and hatch for even a few seconds will quickly evacuate built up heat once you get inside. The fan that is already there uses inside air to cool the batteries.
As for air conditioning and the associated loss of gas mileage, consider that cooler air really is good for the batteries (if not for you), and even with the hit to your MPG, you are getting twice the mileage of anything else on the road.
