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EcoFlow's Most Powerful Off-Grid Energy Solution*
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, DELTA Pro Ultra embraces solar to ensure your essentials, even the entire home, run smoothly in weeks of uninterrupted power.
* DELTA Pro Ultra has the highest capacity and output power of current EcoFlow Portable Power Stations.
EcoFlow's Most Powerful Off-Grid Energy Solution*
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, DELTA Pro Ultra embraces solar to ensure your essentials, even the entire home, run smoothly in weeks of uninterrupted power.
* DELTA Pro Ultra has the highest capacity and output power of current EcoFlow Portable Power Stations.
EcoFlow's Most Powerful Off-Grid Energy Solution*
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, DELTA Pro Ultra embraces solar to ensure your essentials, even the entire home, run smoothly in weeks of uninterrupted power.
* DELTA Pro Ultra has the highest capacity and output power of current EcoFlow Portable Power Stations.
EcoFlow's Most Powerful Off-Grid Energy Solution*
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, DELTA Pro Ultra embraces solar to ensure your essentials, even the entire home, run smoothly in weeks of uninterrupted power.
* DELTA Pro Ultra has the highest capacity and output power of current EcoFlow Portable Power Stations.
6-30kWh Capacity for Weeks* of Comfort
Take home power dependability to another level with up to 30kWh battery capacity. For a standard household, that's weeks of essential backup power to keep lights and appliances, like your fridge, running strong (time may vary). Stackable and space-saving, it packs comfortably into a garage or utility cupboard.
* Backup time depends on the appliances used
One 6900W Unit Easily Covers All Your Appliances
With a 6900W output, EcoFlow DELTA Pro Ultra effortlessly runs even energy-hungry household items, even an EV charger. With X-Fusion, it guarantees a total 6900W output even during charging.
How DELTA Pro Ultra Power Works For You
How DELTA Pro Ultra Power Works For You
How DELTA Pro Ultra Power Works For You
How DELTA Pro Ultra Power Works For You
5 Ways to Quickly Refill So You're Always in Charge
You're spoilt for choice with EcoFlow DELTA Pro Ultra's charging options. As well as all our usual methods, like solar and the grid, you can now power up using a gas generator or even your EV charging pile. With the industry's fastest charging speeds of 8800W, top up two batteries in only 2 hours.
24/7 Energy Management with EcoFlow OASIS
Build Your Own Energy System
Single Load or Area
Solar Panels + DELTA Pro Ultra
- Washer
- Dryer
- EV - compatible with third-party charging piles
Multiple Loads or Areas
Solar Panels + Manual Transfer Switch* + DELTA Pro Ultra
- Utility Room
- Kitchen
- Living Room
*The setup requires a licensed electrician or a qualified professional.Instruction Leaflet
Already Have a Manual Transfer Switch? The MTS compatible with DELTA Pro Ultra must have a rated operational current greater than 40A.
Take With You Anywhere*
With the trolley, take DELTA Pro Ultra with you, whether you are going outside or moving to a new place.
*Portability refers to single-battery setups only. Multi-battery configurations are designed for stationary use.
Backup You Won't Even Notice
With EcoFlow DELTA Pro Ultra's UPS, you'll barely notice an outage. EcoFlow DELTA Pro Ultra safeguards your vulnerable electronic equipment round-the-clock, running at a whisper-quiet 0 dB, so you can work from home or sleep peacefully.*
* For low draws under 2000W
Peace of Mind with an Advanced Design
Peace of Mind with an Advanced Design
Powers Through the Most Challenging Situations
EcoFlow DELTA Pro Ultra tackles even the most gruelling conditions. Whether it's extreme weather or freezing winters, this giant safeguards your power security, just like usual.
Operating temperatures: -20 °C to 45 °C
290V high voltage tolerance
IP54 dustproof and splashproof
*IP54 rating applies only when all ports are properly covered.
What's in the box
EcoFlow DELTA Pro Ultra Inverter
EcoFlow Portable Stand
EcoFlow Disassembly and Assembly Tool
EcoFlow Solar to Low-PV Port Charging Cable
EcoFlow AC Charging Cable-C20
Quick Start Guide
Warranty Card
What's in the box (Battery Box)
EcoFlow DELTA Pro Ultra Battery
EcoFlow Battery Connection Cable (DELTA Pro Ultra) - 0.2 m
Safety Guide
Specs - DELTA Pro Ultra (Inverter)
Dimensions
Inverter: 690 × 481 × 214 mm (27.2 × 18.9 × 8.4 in)
Gross Weight
41.7 kg (91.9 lb)
Net Weight
32.1 kg (70.8 lb)
Maximum Battery Capacity
6 kWh (6144 Wh)
Maximum Expandable Capacity
30 kWh (6144 Wh x 5)
PV Input
High-PV Input: 80-450V-15A 4000W Max
Low-PV Input: 30-150V-15A 1600W Max
AC Input
Charging/Bypass: 200-240V~12.5A, 50/60Hz
Power Input/Output
200-240V~30A, 50/60Hz 6900W Max
AC Output
Discharge : 230V 50Hz 6900W total, 13A(×4) Max per port, 30A(×1) Max per port
Bypass: 220-240V 50/60Hz 2900W total, 12.5A(×5) Max per port
DC Output
12.6V⎓30A, 378W max
USB Ports
USB-C: 5/9/12/15V-3A 20V-5A 100W(×2) Max per port, total 200W
USB-A: 5V-2.4A 12W(×2) Max per port, total 24W
Temperature Range
Charging：-20~45℃(-4~113℉)
Discharging：-20~45℃(-4~113℉)
Storage: -20~45℃(-4~113℉)
Operating Humidity
≤90%
Maximum Operating Altitude
≤3000m (9842 ft)
Noise Level
<=30dB
UPS
< 20ms
Communication Method
Wifi 2.4GHz / Bluetooth 5.0
Ingress Protection Rating
IP54
*IP54 rating applies only when all ports are properly covered.
Monitoring Mode
LCD
Warranty Period
5 Years
Certification
CE,UKCA(IEC/EN/BS62368-1), IEC/EN/BS62109-1/2, IEC/EN/BS62040-1)
Specs-Delta Pro Ultra (Extra Battery)
Model
EFYJ751-BP
Name
Rechargeable Li-ion battery pack
Net Weight
50.7 kg (111.8 lb)
Dimensions
660 × 455 × 204 mm (26 × 18 × 8 in.)
Capacity
102.4V⎓60A, 6,144Wh
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
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 45°C(68°F to 86°F))
Altitude
≤3,000 m (9,842 ft.)
IP Rating
IP54
*IP54 rating applies only when all ports are properly covered.
Certification
CB: IEC62619CE
COC: EN IEC 62040-1, EN 62477-1
IEC： IEC62133-2
IP54 ： IEC60529, UL9540A, UL1973
EcoFlow DELTA Pro Ultra Compatibility
Compare DELTA Pro Models
FAQ
Charging: -20℃～45℃ (-4℉-113℉)
Discharging: -20℃～45℃ (-4℉-113℉)
(No derating below 40℃/104℉).
6144Wh, 102.4V, 32S3P, lithium iron phosphate (LiFePO4) battery.
Over-temperature protection, under-temperature protection, over-discharge protection, overcharge protection, overload protection, short-circuit protection, overcurrent protection.
5V, 9V, 12V, 15V, 20V, 5A, 100W Max (*2)
Minimum display power: 1W
Supported protocols: BC1.2, DCP, APPLE 2.4A, QC2.0, QC3.0, PD2.0, PD3.0
5V/2.4A, 12W (*2)
Minimum display power: 1W
Supported protocols: BC1.2, DCP, APPLE 2.4A, SAMSUNG 2A
No, the battery pack must be charged through the inverter.
It supports hot-swapping with no safety risk. When multiple battery packs are connected, removing one battery pack (not the one connected to the inverter) will not interrupt the output.
Both can be used normally.
Due to stacking methods and wire losses, the design supports only five battery packs.
It can be used normally with humidity up to 93%.
The DELTA Pro Ultra is not a grid-connected product and does not require IEE 1547 certification. Therefore, it does not have this certification.
The DELTA Pro Ultra has a reserved DC input port. If the wind turbine output parameters are within our PV input range, it can be used normally.
The error typically occurs in humid environments when solar panels are placed on the ground and charged via PV and AC simultaneously.
To resolve: 1. Place the solar panels at least 1.5 meters above the ground, such as on a roof or rack. 2. Avoid using solar panels in stormy weather and keep them dry. 3. Avoid simultaneous AC and PV charging in damp environments.
The issue has been fixed in firmware version 5.0.0.49 (Puerto Rico users are not allowed to upgrade to this version).
The electricity price information displayed is the current effective rate. If no effective rate is available, it will not display.
It may be because the user has set a fixed electricity price or the price difference between high and low is too small, leading to the system calculating that no profit can be obtained. Thus, no charge/discharge strategy is generated. It is suggested to switch to scheduled tasks in such cases.
The battery management system periodically calibrates the SOC. During calibration, the SOC limit is ignored, and the battery may be charged to 100%. This calibration occurs every month or after 30 charge/discharge cycles. This is normal logic.
This is to prevent power interruption when switching tasks. The related logic was modified in firmware version 5.0.0.49. With firmware 5.0.0.49 and app version 5.7, users can set a "battery-only discharge task," where AC input is not used during that task, and the DELTA Pro Ultra’s battery will be consumed instead of grid power.
No, the 50A hub does not support mixed parallel connections; it can only connect 2 DELTA Pro Ultras or 2 DP3 units for parallel operation.
EcoFlow DELTA Pro Ultra Launch Campaign Terms & Conditions
Event Introduction
The EcoFlow DELTA Pro Ultra Launch Campaign runs from 1 July (8:00 AM BST, 1 July 2025) to 31 August (8:00 AM BST, 31 August 2025) (hereinafter referred to as the ""Campaign Period""). EcoFlow reserves the right to modify or extend the Campaign Period at its sole discretion without prior notice.
Eligibility
The campaign is open to all users on uk.ecoflow.com who are legal residents of the UK and 18 years old or older as of 8:00 AM on 1 July 2025 (BST) (""participant(s)""). Purchases made on other platforms or websites are not eligible for campaign offers."
"Launch Offer Details
Launch Offer 1: Free Gifts with Purchase (limited quantity)
1. Duration: From 1 July 2025, 08:00 (BST) to 31 August 2025, 08:00 (BST).
2. Details:
(1) Buy EcoFlow DELTA Pro Ultra and receive a Free EcoFlow Trolley (DELTA Pro Ultra). The Free Trolley (MSRP £149) will appear in the shopping cart while supplies last and will be listed in the order information after placing the order. Please note: The Trolley should only be used in single-battery setups. Multi-battery configurations are designed for stationary use.
(2) Buy EcoFlow DELTA Pro Ultra and receive a free Manual Transfer Switch (MSRP £169). The free Manual Transfer Switch is available only when purchased as a bundle with the EcoFlow DELTA Pro Ultra, as indicated in the following purchase link: Purchase link of DELTA Pro Ultra + FREE Manual Transfer Switch.
Please note: The Manual Transfer Switch requires professional installation by a certified electrician. All associated installation costs are to be covered by the purchaser, who is responsible for securing a qualified electrician in their area. Click to read the Instruction Leaflet of the Manual Transfer Switch.
(3) Buy EcoFlow DELTA Pro Ultra + 2 × 400W Rigid Solar Panel and receive a free set of 4 × Rigid Solar Panel Mounting Feet (MSRP £60). The free set of 4 × Rigid Solar Panel Mounting Feet is available only when purchased as a bundle, as indicated in the following purchase link: Purchase link of DELTA Pro Ultra + 2 × 400W Rigid Solar Panel + 4 × FREE Rigid Solar Panel Mounting Feet.
(4) Buy 3 or more EcoFlow DELTA Pro Ultra Extra Batteries and receive a free EcoFlow Fixing Metal Tab (MSRP £29). Please note: Each order is eligible for only one free EcoFlow Fixing Metal Tab. The EcoFlow Fixing Metal Tab is sent out as a separate order, within seven business days after the order for the DELTA Pro Ultra Extra Batteries is created; if you do not receive the EcoFlow Fixing Metal Tab, you can contact the customer service team at support.eu@ecoflow.com for a replacement. If three or more battery packs are stacked, an EcoFlow Fixing Metal Tab is needed to hold them in position. To connect two EcoFlow DELTA Pro Ultra sets or 3 batteries to 1 inverter, install the metal tab to the battery under the 1st inverter.
Launch Offer 2: Bulk savings
1. Duration: From 1 July 2025, 08:00 (BST) to 31 August 2025, 08:00 (BST).
2. Details: Buy EcoFlow DELTA Pro Ultra in bulk (by purchasing 2 or more EcoFlow DELTA Pro Ultra in the same order), get a 7% discount and receive a free EcoFlow Fixing Metal Tab (MSRP £29).
3. Discount Usage: The 7% discount is only applied to the EcoFlow DELTA Pro Ultra. The discount will appear in the shopping cart if the cart is eligible, and will be listed in the order information after placing the order.
4. Free Gift Details: Each order is eligible for only one Free EcoFlow Fixing Metal Tab. The free EcoFlow Fixing Metal Tab will appear in the shopping cart if they are available and will be listed in the order information after placing the order.
Launch Offer Restrictions
1. Availability of Free Gifts: Free Gifts are available while supplies last. No notice will be provided when the Free Gifts run out.
2. Shipping of Free Gifts: If the order is a pre-order, Free Gifts will not be shipped earlier than the EcoFlow DELTA Pro Ultra. When EcoFlow DELTA Pro Ultra is restocked, the Free Gifts will be shipped together with or after the EcoFlow DELTA Pro Ultra. The estimated starting date of the shipment is based on the stock of the Free Gifts and will be announced on the EcoFlow official website.
3. Return Policy:If a customer wishes to return an order or item that qualified for the Free Gifts after the delivery of the Free Gifts, the transaction can only be refunded if the Free Gifts are also returned.The value of Free Gifts is based on the Manufacturer's Suggested Retail Price (MSRP). If the Free Gifts are not returned, EcoFlow reserves the right to deduct the value of the Free Gifts from the refund amount.
4. Restrictions on Free Gifts:Free Gifts cannot be applied to orders placed before the campaign starts.Free Gifts cannot be exchanged for any other item, cash, or credit.
5. Refurbished products are not eligible for this event.
6. The Launch Offers cannot be used in conjunction with any other offers or promotions running on our website unless otherwise stated.
7. The products eligible for the Launch Offers are not eligible for any 30-day price match offers.
General
(1) If you encounter any problems during the promotion, please contact support.eu@ecoflow.com for assistance.
(2) To the extent permitted by applicable law, we may decide to modify these rules or cancel the promotion at any time. If there is any fraud or abuse related to the promotion, we reserve the right to exclude any customer from the promotion.
(3) Participants in the sale agree to be bound by the terms and conditions set forth herein and understand that EcoFlow's decisions are final and binding. No correspondence or appeals will be entertained. EcoFlow reserves the right to make the final and ultimate interpretation of this campaign
(4) During the Campaign Period, all orders must comply with EcoFlow's purchase agreement and return policy.
(5) The sale promotion is not applicable to wholesale or distributor orders
(6) Any unauthorized or fraudulent behaviour will result in disqualification of participants
(7) Participants must comply with all applicable laws and regulations
(8) EcoFlow reserves the right to stop, cancel, or change the promotion at any time during the promotion. Any changes will be announced on the EcoFlow official website.
(9) All prizes in this promotion are limited in quantity and are available on a first-come, first-served basis. Any matters not covered herein will be handled according to EcoFlow's final interpretation
(10) EcoFlow will assume no responsibility for late entries, which may occur for any reason, including but not limited to network transmission failure.
(11) EcoFlow will not be responsible for any direct or indirect losses or damages incurred by any party, including the participants, in connection with, or arising from acts or omissions, or any way related to this campaign.
(12) Participants agree to release and discharge EcoFlow from any liabilities and claims, including breach of contract, tort, negligence, or any other cause of action at law or equity, arising out of, or in any way connected to this campaign or the participant's entry into the campaign.
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