I got a system install 3 weeks ago by a company called Rest. They first said i could have 16 panels on roof then they said 11 over two roof which would need extra for install because of scaffolding, Did need and men install 11 panel was told they where better 4 kw panel as well as a 4k battery system. All installed and asked installer about the app to use had no clue he said never done a system with the brand of kit. They forgot the wifi dongle. Posted out to me and i installed it. The system then showed up an Alarm saying no battery present. That will not be sorted until next week when they call back.. I though the system would be able to run some items in house when there was a power outage ( we have a lot & sister is disabled ) the company said i never ask for that and house would need rewiring and a switch install, they do not do that ??? How would i got about to get this sorted. Live at BT49 9NB