When your utility approves your interconnection, an installation typically lasts just one to three days for residential rooftop; for a longer period for ground mount. Local Rebates and Incentives: Some regional utilities and municipalities present further rebates and incentives for solar installations. It’s worth examining with your neighborhood utility service https://www.tumblr.com/solarsystemwesternaustralia/777781390627504129/choosing-the-best-solar-installers-in-wa-for?source=share