Luckily we have a 3 phase house and so we could get a 20kw system for our family of 6. After a phone consultation, research and a site visit, we were happy to go with Sungen Solar given their prices and the products they stocked. They had a system that ticked all the boxes without us worrying about quality. Paperwork was surprisingly easier then what I heard as they gave us a hand. Not sure if this is the norm. Installation took a couple of days but generally happy considering the size of our system.