[nudded]

No, you must not. The energy required for the car to drive 12kms is 996 Wh. let's round to 1kWh.

Solar is DC. for instance Tesla powerwall is 97% efficiency for DC/DC conversion for charging its battery. So you need basically 1kW of solar to produce the needed energy to drive 12km (per hour). I think you are off by at least a factor of 3.

edit: at 20% solar efficiency that would require 5m^2.

[dmitrygr]

so then your claim is they lose 66% on rectification of AC when they charge from a wall? :)

[nudded]

No, my claim is that their solar claim is not ridiculous ;)

Also, if I do the math on their AC charging. 35km/h gained --> 2905Wh energy. Standard 230AC, 16 amps is 3680W. So I guess the number there is also correct? Take about 85% efficiency, then you have 3000Wh in one hour from 230V AC