EF EcoFlow DELTA Pro 3 4000Wh Extra/Expansion Battery, Lifepo4 Backup — 11-Year Lifespan for Home, RV, Camping & Emergencies

High-capacity LiFePO4 backup: the EF EcoFlow DELTA Pro 3 delivers a 4000Wh LFP battery that can be expanded up to 48kWh using extra batteries or smart generators, providing roughly 2-4 days of whole-home backup power. Built to last with an 11-year lifespan, it’s a robust solution for long-term backup needs.

Massive output and flexibility: supports 120V/240V with a 4000W continuous output (6000W with X-Boost, scalable up to 12000W), able to run heavy loads like a 3-ton* central AC or a 1 HP water pump. Instant protection: the unit features an ultra-fast 10 ms switch-over to keep NAS systems, servers, and home entertainment running without interruption.

Silent operation: X-Quiet technology reduces noise to levels as low as 30 dB, making the DELTA Pro 3 suitable for indoor bedside use or quiet outdoor settings. Versatile recharging: choose from 7 unique charging methods and 18 combo options — AC wall outlets, solar panels, gas generators, EV charging piles, or the EcoFlow smart home panel 2 — so you can avoid frequent refueling.

Ready out of the box: the DELTA Pro 3 is plug-and-play with no installation or maintenance required; its convenient handle and portable design make it easy to move where clean, renewable power is needed. Remote control and monitoring are available through the EcoFlow app for simple management from anywhere.