Quote:
Originally Posted by malcolm
... Suppose we want to deliver 10kWh of energy to the exhausted car (for ~40 miles driving). Taking one hour at 240 V means 42 Amps. But we know 70 amps requires 17kWh for cooling, so the exhausted car will require a further 42.5 Amps for cooling.
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Nah, it ain't so bad. Those 17kWh for cooling are needed if you charge for 3,5hours meaning the cooling system needs about 4kW of power to cool the battery at maximum charging rate of 53kWh / 3.5hours = 17Kw.
If you settle for "transfer" of 10kWh in 42 minutes (the roadster's max charging rate) you end up burning about 16kWh of your energy (10kWh transfered + 3kWh for cooling your battery + 3kWh for cooling recipient battery). It is not impossible, just not very practical.
Trailers are more promissing, we just need a smaller and lighter trailer-gensets than currently available ones.