Just had a call with 50five (numobi) and Shell Recharge.
Shell: fully migrated, our API is no longer of use.
50five: they opened a ticket, but the support employee was quite sure they can´t provide the same functionalities as Shell R. They received already a lot of complaints about the lack of connectivity, but are closing functionalities due to split billing.
Bottom line: back to dinosaur times… we´ll wait on the reply from support and will look at alternative smart chargers in the meanwhile.
Are there hardware modifications we can do to steer the charger based on solar output?