A agent out of your city government inspects your system and supplies acceptance for interconnection. While we don’t specifically keep track of 20kW systems, we do keep track of 10kW & 30kW pricing – historic pricing developments for 30kW systems is often observed inside the graphs under: Hybrid battery models https://bookmarkingalpha.com/story18117655/new-step-by-step-map-for-solar-power-companies-perth