The EcoFlow DELTA 3 Series Portable Power Station features a built-in inverter and expandable lithium battery. The base unit offers 1,024 Wh of LiFePO₄ power, expandable up to 5 kWh via compatible extra batteries (e.g. DELTA 3 Extra Battery, DELTA 2, or DELTA Pro 3 Extra Battery).
It delivers a continuous AC output of 1,800 W and handles power surges of up to 3,600 W using EcoFlow’s X-Boost technology—enough to run 99% of household appliances including coffee makers, electric grills, or hair dryers.
As a homeowner, some of the benefits are:
It will lower your electricity bills - the Management App will identify when to use, charge, and save thereby saving you up to thousands of pounds a year on energy bills.
Storm preparation. In the advent of a major storm, UK residents can ensure critical household loads remain powered during snowstorms, wind outages, or flood-related blackouts. OASIS proactively tops up batteries before grid failure.
Perfect for new builds or retrofit. Whether you’re wiring up stream‑based solar kits or enhancing legacy solar and battery systems, OASIS works with both—making a retrofit simpler and smarter.
Data privacy. For privacy conscious homeowners, EcoFlow's firmware protocol is fully compliant with TRUSTe, NISTIR 8259/8425 and ISO 9001.
Why EcoFlow's DELTA 3 Series works so well as off-grid:
1. Fast charging
It offers five ways to recharge—AC, solar, car alternator, generator, or combining sources via Multi-Charging. You can ensure uninterrupted power because the DELTA 3 Series with Smart Extra Batteries model charges 0–100% in as little as 56 minutes at 1,500 W AC via EcoFlow’s X-Stream technology. Solar inputs support up to 500 W input for about 130 minutes per 1 kWh cycle on the standard model. The power station includes an ECOFLOW AC Charging Cable and 2 grip protectors.
2. Long-life Lithium-FePO₄ battery
Using industrial-grade iron lithium cells, the DELTA 3 retains 80% capacity after 4,000 cycles—meaning daily use of 10 years is realistic. The battery is IP65 rated and is protected by a X-Guard safety design as well as a resilient BMS.
3. Intelligent energy management
EcoFlow’s Oasis platform enables Time‑of‑Use (ToU) scheduling (charge during off-peak hours, discharge during peak), and storm alerts. The OASIS system (short for Optimized AI-based Smart Integrated System) —is a cloud, AI-powered home energy management platform launched in 2025. It intelligently manages solar generation, battery storage, grid usage, and third-party devices—all from a mobile app or web portal. It aims to simplify energy decisions while cutting electricity costs, enhancing resilience, and automating backups.allows for smart billing and scheduled performance in theory.
The OASIS analyzes:
- real‑time energy use
- solar output
- time‑of‑use tariffs
- weather and seasonal trends
Since the management app plays a large role for the user, it is best for:
- Homeowners with solar and battery seeking automation rather than manual toggling
- Properties with time-of-use tariffs or frequent weather disruptions
- Smart home enthusiasts wanting integration without rebuilding their system
As Smart Home World puts it: “OASIS brings a more capable software layer to simplify whole‑home energy management.” For anyone ready to embrace smarter solar and energy use in their UK home—with control, insight, and flexible integrations—EcoFlow Oasis is a standout choice.
In addition, the OASIS management app is fully compatible with other EcoFlow devices such as the DELTA 3 Plus, RIVER 3 Plus chargers, Smart Generator 4000 (hybrid genset), Europe’s PowerOcean system.
4. Built-in UPS backup
With sub-10 ms switchover time, the DELTA 3 Plus can function like an uninterruptible power supply (UPS), protecting against power loss to sensitive appliances such as network devices and medical equipment.
5. Quiet, mobile, versatile
While a generator lets everyone know you are using one, EcoFlow's portable power station is really quiet. It produces just 30dB of noise for under 600 W. Weighing just just 12 kg with 11 output ports(including 4 AC outputs, 2 USB‑C (up to 100 W / 140 W on the Plus), USB‑A, DC ports, and a car 12 V outlet.
What Appliances Can It Power—and for How Long?
Based on EcoFlow’s internal test data, here are typical runtimes using the base 1,024 Wh unit (add 2–5x run times with expansion batteries):
- Refrigerator (120 W average): 7–14 hours
- Coffee machine (1,200 W) or electric grill: 0.7–0.8 hours
- Laptop: - 16 charges (approx. 5 Wh per day standby)
- Fan (60 W): 17 hours
- Wi‑Fi router: 58 hours
- Smartphone: 89 full charges
- TV (75 W) + gaming console: 3.7 hours gaming or 8.2 hours media playback if the system stays at -125–275 W
With extra batteries:
- Up to 5 hours of continuous heavy loads (drills, saws, multi-device chargers)
- Multiple days of low-load home backup (lights, router, fridge) even off-grid
Recommended Configurations for Off-Grid Home Backup
|
Battery Configuration |
Capacity | Suitable For | Run Time |
| DELTA 3 (base) | 1.03kWh | basic lighting router, phone | 1 day off grid utility |
|
DELTA 3 + 2 x smart batteries |
3.0kWh | lighting, refrigerator, tools | 3 - 4 days off grid (with conservative loads) |
| DELTA 3+ | 5.0kWh | Light HVAC, tools | 5 days off grid depending on usage |
You can also use solar panels (500–1,000 W) for self-charging if you go camping to a remote location. With the AC or EcoFlow Smart Generator (3 kW dual-fuel) for extended backup.
Advantages of the EcoFlow DELTA 3 Series:
- High port count and flexibility supports powering most household circuits
- Fast AC or solar recharge makes short waits between outages feasible
- Expandable storage means longer runtimes or gas‑free living
- Quiet and clean operation is ideal for indoor use and low‑noise areas
- EcoFlow comes with a 5 year warranty
- Troubleshooting Scenarios:
UPS operation may be unreliable under generator backup (non‑pure sine wave) or fluctuating input—it may drop load entirely instead of switching to battery as expected
Time-of-Use automation often doesn’t activate as intended and can lead to inefficient use or charge/discharge errors
How to Use the DELTA 3 Safely and Effectively Off-Grid
- Use a pure‑sine wave generator or solar/AC to charge—avoid super-cheap or eco‑mode generators that cause voltage sags.
- Set up Load‑Balancing by plugging heavy draws (microwave, heater) into separate phases if available.
- Disable Grid Bypass if using a variable or noisy generator—run purely off battery to avoid input issues.
- Store in a ventilated, shaded area for best cycle longevity (keep within operating temperature).
- Keep EcoFlow firmware up-to-date and register for Storm Notifications for grid restoration alerts.
Conclusion
For a modern solution to off-grid backup and home resilience, the EcoFlow DELTA 3 Series Portable Power Station brings together fast charging, long‑lasting LFP cells, compact portability, and flexible expansion. It can run your fridge, lighting, tools, and electronics reliably, and with expansion battery modules, can support light HVAC or small cooktop systems.
While it’s not a flawless replica of a data‑centre UPS or industrial‑grade inverter, careful application and proper generator pairing help avoid pitfalls. The market-leading fast recharge and other smart features make it a compelling alternative to noisy generators or fixed solar‑plus‑inverter systems—especially for users who need portable power with strong off-grid credentials. If you’ve camped with a portable power station or managed a construction site without grid access, the EcoFlow DELTA 3 Series Portable Power Station 's durability and features are excellent.
