Expandable capacity - 2-6kWh expandable capacity to fit your energy storage needs. Add up to two DELTA 2 Max Smart Extra Batteries to hit a capacity of 6144Wh. Ideal for home backup, RVing, outdoors or even everyday use. Built to last 6× longer - Get 10 years of daily use until hitting 80% of its original capacity. Thats down to its LFP battery chemistry giving you 3000+ cycles. Huge AC output - With X-Boost mode get up to 3400W output power to run 99% of home appliances. Power 15 devices at once including 6 AC outlets. Fastest recharging - World's fastest AC recharging and X-Stream dual AC+Solar charging speeds. Up to 1000W solar input to charge in as fast as 2.3 hours. Capture more energy - 99% MPPT efficiency maximizes solar generation anytime. Customized in-app energy management - Prioritize solar or AC charging, view input and output power, battery levels and more. 5-Year warranty