I had a solar battery fitting by Sustainable Energy in 2019. The batteries developed a fault in June 2020. This fault was was caused by a fault in the batteries. I'm not technical so all I know is that they didn't work. Adam and Steve came around the same say as I reported the fault and Adam, the Engineer, quickly identified what was wrong. I think it's important to write reviews about post installation, so that customers know what an installer is like and his work ethic after he has taken your money. It's more important to know how an installer reacts when things go wrong. The battery supplier, Pylontech were less than useless. Steve copied me in to every email sent to the company to try to get my batteries replaced, which appeared to be on deaf ears. So the short version of my story is that my batteries were replaced free of charge, by SolaX in conjunction with Sustainable Energy. My batteries were delivered Monday and fitted Tuesday. I also would like to note the batteries appear to be far better than the ones I originally purchased, take up much less room and to be honest, just look better. Its the small things that make a good job and the workmanship and attention to detail are what make a company. As far as I'm concerned, Sustainable Energy may be a small family run firm, but they are as good as anyone in the market today, I wouldn't go anywhere else.