Sumec North America/Phono Solar 1800SJ Solar Generator Kit, 1800-Watt - Quantity 1 Internal transfer switch will automatically switches to solar generator 1800 battery power in the event of a power outage and the grid power is interrupted Ideal solar generator for remote locations, emergency power back up system or just for someone who is tired of paying the utilities companies their hard earned money Solar generator system is highly customizable - you can add up to 3 more 140 solar panels and add 2 more 100 ah batteries for a total of 4 100 ah batteries to provide all the power most will need 5 year product warranty with manufacturer & 25-year performance guarantee (90% up to 10 years, 80% up to 25 years) Bright LED light will shine over the AC plugs during a power outage to ensure easy and safe access to plugs