a 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. a Built to last 6x; longer: Get 10 years of daily use until hitting 80% of its original capacity. That&';s down to its LFP battery chemistry giving you 3000+ cycles. a 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. a 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. a Capture more energy: 99% MPPT efficiency maximizes solar generation during the daytime. a High conversion efficiency rating - guarantees a faster solar charging speed. 0-100% in 2.8 hours (2 sets) or 0-100 in 5.4 hours (1 set). a Customized in-app energy management: Prioritize solar or AC charging, view input and output power, battery levels and more. a 5-Year warranty: 5 years for DELTA 2 Max, 12 months for 400W Solar Panel.