Deye Inverter looses functionality after extended power outage - does not power the house anymore... so useless.

I purchased and had a 5kw single fase Deye Inverter installed Sept 2023 - no Solar, just a single battery. There were some teething issues, but eventually it worked. After a serious power outage February this year it did not fully load the battery and did not 'see' the house - if it switched from Eskom Feed to Inverter there was no power in the house. The technician came and did something with ***** drivers opening up the unit and some settings and after that the battery charge showed 100% again and the inverter worked. Now after a serious outage two weeks ago I have the same issue - does not charge fully and if I switch from Eskom to inverter - no power. The installer says its not their fault or faulty equipment, its just how it works... I cannot believe that.. then Deye inverters are not the answer.

They only work while the battery has power... after that they need expert TLC at a cost of R500 per hour.