Upgrading a car with the 7,2kW-charger to the 22kW is not possible.
The 22kW charger is based on the chameleon charger by Renault, buthas been highly optimized so it's for example while charging with just 1-phase up to twice as efficient as in the Renault Zoe (R240 / R90). Due to the optimizations the 22kW-chamäleon charger, the smart is equipped with, is way more reliable than the Zoe.
Suppliers: Delta Electronics EMEA
Input: 1-phase @ 32 A (100 V - 240 V)
Output: 260 - 420 V
Charger subject to surcharge
Original: Renault, but clearly optimized by smart
Designation: Chameleon charger
Input: 1-phase or 3-phase @ 32 A (100 V - 240 V)
Output: max. 410 VDC @ 80 A