Model S uses waste motor/inverter heat to warm the pack, probably not enough extra heat to provide much for the cabin. Remember one of the main benefits of an EV drivetrain is high efficiency, which means little waste heat.
so what happens if the Tesla S stands still in winter for a week? Any insulation around the pack ? vaccum insulation would be ideal, very thin but efficient.
Something to consider as well, is that for the majority of people whose power doesn't come from mainly renewables, burning gasoline for heat is far more efficient and less carbon heavy than electric power generation, transmission, and battery storage.
They make the water warm in summer with solar heating. Such a tank only looses a degree or so in a week. Of course they use like 20cm insulation.
But vacuum insulation is like 5-10 more effective than rockwool. Only flaw here with vacuum insulation is that it is stiff(not bendable and cost 80€/m²)
They dont need any additional energy. fully solar heatd.
Vacuum insulation looses 0,73 W/m²K (10mm)
So at 20° delta T one m² loss is only 14Wh/m²
Surface of tesla battery? 10m²? 140W loss per hour. How much uses Model s now,if anything?
Question is , would it be worth it to spend 140W of power to an e-car if it stands over night plugged in or over a wireless pad.
Last edited by Kitt; 2014-04-22 at 05:08 AM.
ha.... i have forgotten that. Great!
At 1000W 5% loss means 50 W heating.
I wasn't thinking of putting a water tank into a car. lol
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