The battery that turns a solar panel into a power system
A solar panel without storage is a daytime-only tool. The DELTA 3 Ultra is what makes your 400W panel or other solar setup useful around the clock. It holds 3,072Wh, enough to run a real off-grid setup through the night and recharge from the panel the next day. Just sun, storage, and off-grid energy on your terms.
Why It Works for You
3,072Wh of storage built for off-grid use: At this capacity, you're covering your fridge, fan, lights, and Wi-Fi continuously, day after day, powered by the sun
3,600W output with X-Boost: Powers virtually everything in an on- or off-grid home, from refrigerators and window AC units to power tools and medical equipment. X-Boost extends that ceiling to 4,600W for heavy appliances
800W solar input: The Ultra accepts up to 800W, which means there's room to add a second 400W solar panel or multiple 220W panels later if you want faster recharge times or more generation
Certified durable and reliable: 24/7 protection with a Class-B certified Battery Management System (BMS) and structure that protects against overnight condensation and off-road bumps during transport.
10ms automatic switchover: If the grid goes down, the Ultra switches to battery power in 10 milliseconds, fast enough that your router, NAS, and sensitive electronics never notice the interruption
Safe, reliable power, 10-year lifespan: The same battery chemistry used in medical equipment. Rated for 4,000+ charge cycles to 80% capacity, meaning reliable performance for roughly a decade of daily use
Runs silently: 25dB under load, quieter than a conversation. You can run it in a bedroom, garage, or living room without it being a nuisance
EcoFlow app control: Monitor battery level, solar input, and savings in real time. Storm Guard mode automatically charges the unit to full when severe weather is detected in your area
5-year warranty: Three years standard, plus two more when you register in the EcoFlow app
What It Powers
Paired with two EcoFlow 400W solar panels, one full day of sun recharges the Ultra from empty in roughly 4–5 hours. A full charge keeps an off-grid setup running:
- Mini fridge running continuously for over 3 days
- Box fan on high for 2+ days
- Wi-Fi router for nearly 2 weeks
- LED lights for several days
- Phone charged roughly 200 times
In practice, you're not running all of these at once from a single charge. Running a mini fridge, fan, Wi-Fi router, and lights simultaneously draws roughly 150–200W total, giving you 15–20 hours of continuous runtime before needing to recharge from the panel.
The Lifetime Picture
At 3,072Wh capacity and daily solar cycling over 10 years, this system can deliver well over 100,000Wh of stored energy across its lifetime. At the U.S. average electricity rate, that represents substantial long-term value, especially in high-rate states where every kilowatt-hour avoided saves more.
The Tech Specs
Capacity: 3,072Wh (51.2V, 60Ah)
Cell Chemistry: LFP (LiFePO4)
AC Output: 120V~60Hz 3600W total (surge 7200W), 20A(x4) Max per port, 30A(x1) Max per port
X-Boost: 4,600W
Max Photovoltaic (PV) Solar Input: 800W
AC Input: 100–120V~15A, 50/60Hz
USB-C Output: USB-C(x1): 5/9/12/15V-3A, 20V/28V--5A, 140W Max(HID)
USB-C(x2): 5/9V/12V/15V-3A 20V-2.25A, 45W Max per port, total 45W
USB-A Output: USB-A(x1): 5V-3A/9V-2A/12V-1.5A, 18W Max
Car Port Output: 12.6V, 10A, 126W Max
UPS Switchover: <10ms
Noise Level: < 25dB at 600W
Operating Temperature: 20°C–30°C (68°F–86°F) optimal; charges 0°C–45°C; discharges down to -10°C
Connectivity: Wi-Fi and Bluetooth
EMC Certification: Class B
Dimensions: 24.6" × 12.9" × 15.5"
Weight: 72.1 lbs (±01.3 lbs)
Warranty: 5 years (Includes 3-year standard warranty and 2-year extended warranty available upon EcoFlow App registration.)
