—This is the Anern 3600Watt(3.6kVA) Hybrid Solar Inverter that comes with 2 Lithium Batteries and free installation and setup for your Home, Office or Building with up to 12-Hours of Power Back. —This Inverter automatically switches to Battery Power when your Umeme Power goes off and it will switch back to Umeme Power when it comes back. This switch is immediate & automatic so you won't even notice the Power went off. —This Inverter also supports Solar Power which can charge the Batteries even when Umeme Power is off which guarantees you Uninterrupted Power all day long. The Solar Panels are sold separately. —The Inverter comes with 2 Batteries that give you up to 12-Hours of Power and you can add up to 8 Batteries to give you up to 4 Days of Power. —The Inverter comes with an App that lets you monitor Power Usage & Battery info on Phone.