I have made the mistake of having solar panels installed by Octopus Energy. A 2 day job is going to take nearly 2 months. They started the job on time, but when things started to go wrong they stopped the work and told me they weren't coming back for nearly 6 weeks. I have 5 out of 14 working panels which are proving to be far less efficient than advertised, apparently they don't like the heat! There is also a large pile of neatly stacked waste sitting at the front of my house. I'm losing money and I've totally lost any faith I had in the company. I believe that once you have a problem which is likely to result in negative reviews they put you on the back burner, safe in the knowledge that it won't get any worse for them.