The Powerwall from Tesla is the most popular solar battery in the field, and due to the fact batteries are rising in popularity, we love to see this feature out there from any installer. The standard Price tag per watt of solar in California is about typical, sitting at $three.33. https://www.tumblr.com/californiasolarinstallation/761498651179794432/why-buy-maintenance-services-from-solar-companies