https://sonomotors.com/en/technology/they claim
"[...] This enables the Sion to generate an additional range of up to 5,800 kilometers per year – using only solar energy. Completely free of emissions and free of charge."
^^ that range is "measured for Munich"
and later they add this graph:
- At least the "Average cloudy sky" data sums up to the 5800 km per year. (most bullshit bingo companies would have assumed a full year of clear sky)
- also claimed is 220W/m^2 maximum panel efficiency
For the car they claim:
- "The battery capacity of 35 kWh enables a range of 255 kilometres according to WLTP driving cycle"
--> So 35kWh / 255 km calculates to 0.137 kWh/km .... or 13.7 kWh / 100 km
( btw... real driving (on a german Autobahn) will be >20kWh / 100 km ...... but just reasonable marketing lie factor was deducted here)
--> correcting their shitty units on their graph: 22 km ( averagely clouded day in Apr-Jun ) calculates to:
22km * 0.137kWh / km = 3.014 kWh
-->(for completly sunny day in Jun... in Munich)
34km * 0.137kWh / km = 4.658 kWh
--> for the entire year
5800km * 0.137kWh / km = 794.6kWh
In the Munich Area some solar power values are:
Plant dimensions 0.32 kWp
Module pitch 30 °
Module orientation 180 ° (S)
Yield per year 343 kWh
(these would be 2 modules ...
each 200W peak ... Area of 1580mm * 808mm = 1.277m^2 )
Source:
https://stromrechner.ibc-solar.de/--> To Yield 794.6kWh per year one would need 0.32kWp * (794.6kWh / 343 kWh) = 0.7413 kWp
And according to their own 220 W/m^2 "peak performance" ... this would be : 0.7413 kW / ( 220 W/m^2 ) = 3.3695 m^2 (square meters)
BUT REMEMBER ... this is the estimated projected area of solar cells facing 60 degrees elevation ... perfectly South ... shaddow free ... 0% loss for battery up till now.
Now I hand-over to somebody calculating the size of the car... based on that marketing thing where the cells are visible :