I don’t know about importing (to where) however there is an issue with the battery rental. Might be better to buy in Norway and export fro there.
As for the Solar part, I know a bit about the process but not about commercial offerings. The Twizy needs minimum of 10amps at 240V or 2400w if draws less after it has started but work on that basis. So if no battery storage of Solar energy is used you need to be generating at least 2400w which then depends on how much sun you are getting. I’d say a 3 to 4kw array is required to cover the sun at different times of the day and ensure you get the required output. You have to allow some losses for the Inverter (DC to AC).
The other way is to go for battery storage and charge the battery bank over a day from the Sun and then charge the Twizy at any time from the battery bank. This would require a much small array and roof to your cage. However the battery bank would cost more than the solar panels.
I use a compromise, A grid tied Solar array that when the sun is bright then the Twizy can charge from the solar array the rest of the time the solar array is supported by imported electricity from the grid. Allows me to charge any time of day and even use Solar in the UK.