EcoFlow Delta Pro Ultra Review: Unleashing Home Backup Power
Delta Pro Ultra Review – EcoFlow DELTA Pro Ultra is a residential power backup system designed for both extended outages and daily use. With its unrivaled capacity, input power, and output power, a single unit can run your entire home.
1. Delta Pro Ultra Key Features
- Continuous Power
With EcoFlow DELTA Pro Ultra’s UPS technology, you’ll get impeccable, uninterrupted power flow. EcoFlow DELTA Pro Ultra safeguards your vulnerable electronic equipment round-the-clock. For extended outages, you don’t want to hear your backup in the background, so for low draws under 2000W, it’s completely silent. With a whisper-quiet 0 dB, your nights remain undisturbed as it powers your devices. - Expandable Capacity
The rated capacity of one battery is 6kWh. To expand capacity for powering your appliances (see Overview or Power Your Appliances) or backing up your whole home (see Backup System), one can connect up to 5 batteries to an inverter or up to 15 batteries to 3 sets of inverters, which makes the total capacity add up to about 30kWh to 90kWh. - Home Backup
The DELTA Pro Ultra can either be used as a stand-alone unit using various recharging options (low/high voltage solar systems, generators, EV chargers, etc.) or form a whole home backup system to ensure that your home can be powered 24/7 without any influence from power outages.
2. Delta Pro Ultra Specifications
2.1 EcoFlow DELTA Pro Ultra Inverter
 | |
| General | |
|---|---|
| Model | EFYJ751-PCS-US EFYJ751-PCS-EU EFYJ751-PCS-UK EFYJ751-PCS-AU |
| Net Weight | Approx. 32.1 kg (approx. 70.8 lb) |
| Dimensions | 690 × 481 × 214 mm (27.2 × 18.9 × 8.4 in.) |
| Wi-Fi | Supported |
| Bluetooth | Supported |
| Output | |
| AC Output (Discharge Only) | US: 120/240V～60Hz 7200W total, 120V～20A (×4) Max per port, 120V～30A (×1), 240V～30A (×1) EU: 230V～50Hz 6900W total, 16A (×4) Max per port, 30A (x1) Max UK: 230V～50Hz 6900W total, 13A (×4) Max per port, 30A (x1) Max AU: 230V～50Hz 6900W total, 15A (×5) Max per port |
| AC Output (Bypass Mode) | US: 100-120V～ 50/60Hz 30A total UK/EU: 220-240V～ 50/60Hz 12.5A (×5) total AU: 220-240V～ 50/60Hz 10A (×5) total |
| USB Output | USB-C (× 2): 5/9/12/15V⎓3A, 20V⎓5A, 100W Max per port, total 200W USB-A (× 2): 5V⎓2.4A, 12W Max per port, total 24W |
| 12V DC Output | 12.6V⎓ 30A, 378W Max |
| Input | |
| AC Input (Charge Only) | US: 100-120V～15A, 200-240V~12.5A, 50/60Hz UK/EU: 220-240V～12.5A Max 50/60Hz AU: 220-240V～10A Max 50/60Hz |
| AC Input (Bypass Mode) | US: 100-120V~15A, 50/60Hz (duration < 3hrs when the current exceeds 12A) UK/EU: 220-240V～12.5A Max 50/60Hz AU: 220-240V～10A Max 50/60Hz |
| Power Input/Output (US) | 100-120～30A; 200-240V～30A, 50/60Hz |
| Power Input (EU/UK/AU) | 200-240V～30A, 50/60Hz, 6900W Max |
| High-PV Input | 80-450V⎓15A Max, 4000W Max |
| Low-PV Input | 30-150V⎓15A Max, 1600W Max |
| PV Input Short-circuit Current | 23A |
| Environment | |
| Discharge Temperature¹ | −20°C to 45°C (−4°F to 113°F) |
| Charge Temperature¹ | −20°C to 45°C (−4°F to 113°F) |
| Storage Temperature | −20°C to 45°C (−4°F to 113°F) (optimum at 20°C-30°C / 68°F-86°F) |
| Altitude | ≤3000 m (9842 ft) |
| Overvoltage Category | PV (II), AC (III) |
| Pollution Degree | 2 |
| Other Info | |
| IP Rating² | IP54 |
| Noise Level | <30 dB |
| UPS | EU/UK/AU: <20 ms US: Backup UPS <20 ms; online UPS 0 ms |
| Communication Method | Bluetooth & Wi-Fi |
2.2 EcoFlow DELTA Pro Ultra Battery
 | |
| General | |
|---|---|
| Model | EFYJ751-BP |
| Name | Rechargeable Li-ion battery pack |
| Net Weight | Approx. 50.5 kg (111.3 lb) |
| Dimensions | Approx. 660 × 455 × 204 mm (26 × 18 × 8 in.) |
| Capacity | 102.4V⎓60A, 6,144Wh |
| Battery | |
| Cell Material | LFP |
| Cycle Life | The battery maintains 80%+ SOH (state of health) after 3,500 cycles at 0.5C/0.5C at 25°C (77°F) |
| Protection type | Overvoltage protection, overload protection, overtemperature protection, short circuit protection, low temperature protection, low voltage protection, overcurrent protection |
| Other | |
| Temperature | Discharging temp: −20°C to 45°C (−4°F to 113°F) Charging temp: −20°C to 45°C (−4°F to 113°F) Storage temp: −20°C to 45°C (−4°F to 113°F) (optimum: 20°C to 30°C(68°F to 86°F)) |
| Altitude | ≤3,000 m (9,842 ft.) |
| IP Rating | IP54 |
3. How It Works
3.1 Supported Appliances
- Appliance Compatibility
Refer to the information below to ensure that your appliances are compatible with DELTA Pro Ultra. If you choose to proceed with incompatible appliances, DELTA Pro Ultra may not be able to provide backup power effectively. To avoid this, please check the following specifications carefully. - Compressor-based Appliances
For any compressor-based appliance, please ensure that the RLA (Rated Load Amps) and LRA (Locked Rotor Amps) of your appliances are compatible with the corresponding specs of the inverter. Compressor-based appliances include air conditioners, heat pumps, fridges, etc. - Resistive-based Appliances
Resistive-based appliances include tank water heaters, tankless water heaters, etc. Refer to the specifications of the DELTA Pro Ultra to ensure its power ratings are compatible with your appliances.
4. Backup System
The DELTA Pro Ultra can be used to create a whole-home backup system that stores power for your appliances using several schemes. You can check daily/monthly/yearly figures or configure settings via the EcoFlow app. You will enjoy an outage-free life after installing this whole-home backup system, which is specifically suitable for emergency backup during hurricane seasons, power outages, peak power demand, and so on.
4.1 Connection Schemes
Scheme 1 (EU/UK/AU Version Only)
- A. Electrical panel
- B. Automatic Transfer Switch
- C. EcoFlow DELTA Pro Ultra
Scheme 2 (EU/UK/AU Version Only)
- A. Electrical panel
- B. Manual Transfer Switch
- C. EcoFlow DELTA Pro Ultra
5. EcoFlow DELTA Pro Ultra Installation
5.1 Mounting On a Portable Stand
- Install the portable stand, the battery, and the inverter in sequence, with the battery ports of both the inverter and battery installed on the same side, and ensure that the inverter and the battery are properly installed into the corresponding grooves.
- Open the protective covers and connect the battery connection cable.
- An inverter supports up to 5 batteries. During installation, please note that battery connection cables should be installed in the right sequence as in the illustration. If you connect more than 3 batteries, lock the brakes of the mount casters after installation.
| Installation | ||
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5.2 Mounting Two Sets Of Units
If you have 2 sets of products, you can put one set on top of the other set. Note that the top set should be installed with supporting legs instead of casters.
CAUTION
- For this installation option, one can connect up to two batteries to an inverter.
- The EcoFlow Fixing Metal Tabs need to be fixed to the battery under the top inverter.
5.3 Mounting On A Shelf
If you plan to put the inverter and the battery in different places (for example, on a shelf, on the ground, etc.), you can connect them with a 0.75 meter-long battery connection cable.
5.4 Mounting On The Trolley
To easily move the product, you can also mount the set on the trolley, but please note that you can only mount one inverter and one battery on the trolley.
Best Seller
EcoFlow DELTA Pro Ultra Power Station
Price: €4,999.00
DELTA Pro Ultra (Inverter + Battery) has the highest output and capacity of any EcoFlow portable power station to date. As well as offering colossal energy storage and a flexible design that fits your power needs,
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