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EcoFlow DELTA Pro Ultra: Complete Overview (2024)

  • Post last modified:20 June 2024
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Welcome to our review of the EcoFlow DELTA Pro Ultra, the latest and most robust whole-house backup solution from EcoFlow. In this article, we will give you a detailed explanation of the features, specs, and capabilities of the DELTA Pro Ultra, as well as a comprehensive overview of user feedback, and a look at possible alternatives. Whether you’re preparing for extended outages or simply looking to achieve more energy independence, we will help you decide whether the DELTA Pro Ultra fits your energy backup needs.

The DELTA Pro Ultra is, as its name suggests, an absolute beast, so there’s a lot to cover about this product. With that said, we’re excited to get into it – so let’s dive in. 

A whole-house backup system is a reliable and comprehensive solution to power outages, ensuring that your home remains functional during power outages and grid failures. These systems are crucial for maintaining essential appliances like refrigerators, air conditioning, and heating, minimizing disruption to daily life. They are especially valuable in areas prone to severe weather conditions, or where power reliability is a concern. 

Investing in a whole-house backup system not only enhances your home’s resilience against outages, but also contributes to energy independence by integrating renewable energy sources, such as solar power.

At the time of writing, the DELTA Pro Ultra is only available to purchase in the US and Canada. 

Inverters are essential devices that convert direct current (DC) electricity into alternating current (AC) electricity. This conversion is crucial because most household appliances and electronic devices require AC power to operate, but many renewable energy sources, like solar panels and batteries, produce DC power. Without an inverter, the DC electricity generated by these sources couldn’t be used to power most home appliances, making inverters a vital component in utilizing renewable energy effectively. They ensure that the energy captured from renewable sources can be converted into a usable form for everyday applications, from lighting and heating, to running appliances and charging devices. 

Note that most home backup solutions, including the EcoFlow DELTA Pro Ultra, come with an integrated inverter as part of the system. 

EcoFlow, founded in 2017, specializes in portable power solutions like power stations and solar panels. Known for their fast-charging technology, they set industry standards and remain distinguished by it. Their range now includes solar generators and accessories, serving a wide audience from travelers to homeowners.

For more information about EcoFlow, check out our ‘Bluetti vs EcoFlow’ comparison article. 

DELTA Pro Ultra
Starter Kit

ecoflow delta pro ultra: starter kit

Price (US): $5,799
Price (CAN): $7,199 ($7,999)

6kWh | 7200W | 120V & 240V

1x DELTA Pro Ultra Battery
1x Inverter 

DELTA Pro Ultra
Intelligent Kit

ecoflow delta pro ultra: intelligent kit

Price (US): $7,499
Price (CAN): $9,398 ($10,698)

6kWh | 7200W | 120V & 240V

1x DELTA Pro Ultra Battery
1x Inverter 
+ Smart Home Panel 2

DELTA Pro Ultra
Hassle-Free Kit

ecoflow delta pro ultra: hassle-free kit

Price (US): $8,999 ($9,499)
Price (CAN): n/a

6kWh | 7200W | 120V & 240V

1x DELTA Pro Ultra Battery
1x Inverter 
+ Smart Home Panel 2
+ Installation Fee

Additional options:

  • Customize bundle – (US) – add-ons including Transfer Switch 306A / A510A, 50 Amp Hub, PowerInsight, EV Adapter, AC Generator Charging Adapter
  • Additional batteries (6kWh) – US: $2,999 ($3,299), CAN: $4,199 ($4,799

Overview of EcoFlow DELTA Pro Ultra

The EcoFlow DELTA Pro Ultra is EcoFlow’s advanced whole-house backup solution, engineered for both emergency situations and daily energy needs. With its option of additional stackable battery units, this system features a versatile capacity range from 6kWh (the base capacity of a single unit) to 90kWh, and an output of 7.2kW to 21.6kW, making it capable of powering an entire household’s appliances and systems. It supports a solar input of 5.6kW to 16.8kW, allowing efficient integration with solar energy setups.

A standout feature is the optional EcoFlow ‘Smart Home Panel 2’, which is the central hub for managing and directing the flow of electricity generated by the EcoFlow DELTA Pro Ultra and other EcoFlow devices within your home. It offers auto-switchover, energy monitoring, and opportunities for electricity bill reductions. Its design allows for stackability, offering flexibility in storage and output expansion to meet varying power demands. The DELTA Pro Ultra accommodates multiple energy sources, from solar to gas, ensuring adaptability to different energy setups.

The system also includes a 0-ms downtime Online UPS for uninterrupted power, and features EcoFlow’s ‘X-Cooling’ technology for efficient operation. This cooling system ensures the unit remains quiet, especially under loads below 2000W, for minimal disturbance. The DELTA Pro Ultra also comes with a 5-year warranty, giving you peace of mind for its reliability and performance. 

Key Features at a Glance

Here’s a quick overview of the DELTA Pro Ultra’s key specifications and capabilities:

  • Output Capacity: Offers an output range from 7.2kW to 21.6kW, capable of supporting a wide range of household appliances, from essential lighting to energy-intensive air conditioning systems.
  • Energy Storage: With a base storage capacity of 6kWh, which can be expanded up to 90kWh through additional battery units, it provides enough power for both daily use and extended outages and emergencies.
  • Versatile Charging Options: Supports charging from a variety of sources, including solar panels, the grid, generators, and even EV charging stations, ensuring flexibility in how it is powered and charged. It also allows simultaneous grid + solar charging. 
  • Solar Input: For solar charging, it accepts solar input between 5.6kW and 16.8kW. 
  • Smart Home Panel 2: The optional integrated EcoFlow Smart Home Panel 2 enables advanced energy management, including auto-switchover during outages, energy consumption monitoring, and optimization strategies to reduce electricity bills.
  • Expandable System: Its modular design allows for quick and easy expansion of storage and output capabilities, meaning it is fully adaptable to your energy needs.
  • Silent Operation: It is designed to operate quietly, especially under low power draws (i.e. loads of 2000W and below), to ensure minimal disruption.
  • Durability and Reliability: Built to withstand various environmental conditions, ensuring dependable power backup in challenging situations.

Power Capacity and Output

The EcoFlow DELTA Pro Ultra is one of the most powerful home back-up energy solutions on the market, with its versatile power capacity ranging from 6kWh to an enormous 90kWh. This range is possible due to its stackable design, where additional battery units can be connected to enhance storage capacity – starting at 6kWh with the initial single base unit, and expanding up to 90kWh with 15 stackable units. This feature is particularly useful in areas prone to prolonged power outages or for households with high power consumption, as it ensures a continuous power supply to all essential and high-demand home appliances.

The unit’s output capabilities are equally impressive, starting at 7.2kW and reaching up to 21.6kW by incorporating additional inverters (for a total of 3). This scalable output means that a single EcoFlow DELTA Pro Ultra can efficiently run a variety of household devices, from basic lighting fixtures to a 3-ton central air conditioning system, according to EcoFlow. 

Solar Input Capabilities

The EcoFlow DELTA Pro Ultra offers a range of charging options, including solar, AC, EV charging stations, and generators. Among these, its solar input capabilities are particularly attractive for those with a preference for incorporating renewable energy and sustainability into their energy setup. Furthermore, the DELTA Pro Ultra also allows for simultaneous charging by AC and solar, which can be monitored on the smart app. 

The DELTA Pro Ultra unit supports a solar input range from 5.6kW to 16.8kW, depending on the number of inverters connected. This allows for rapid charging of the system – a single hour of sun can yield enough energy for a whole day’s use. 

To make things easier, EcoFlow offer one or more 400W Portable Solar Panels as an optional add-on to the DELTA Pro Ultra. With a 400W output, the panels are designed for durability, with a conversion efficiency of up to 23% and an IP68 waterproof rating, making them suitable for outdoor use in various conditions. Their one-piece folding design and self-supporting structure with adjustable angles make them easy to set up and optimize for maximum sun exposure. 

Energy Storage Options

The basic unit of the EcoFlow DELTA Pro Ultra has a battery of capacity of 6kWh (6,000 Wh), it doesn’t stop there. For those needing more power, you can buy extra units to boost your system’s capacity – up to 15 total battery units for a total capacity of 90kWh. 

According to figures from the US Energy Information Administration (EIA), the average American household uses around 30kWh per day, meaning a 15-unit DELTA Pro Ultra setup with 90kWh capacity could power the average house in its entirety for approximately 3 days. According to EcoFlow, this equates to 30 days of ‘essential backup power’ to keep appliances like lights and refrigerators running in the event of a grid outage. 

What’s more, whilst 15 battery units might sound like a lot, their stackable design means that they take up minimal room, and can be stored even in rooms with limited space. 

Powering Your Home Appliances

With a base output of 7.2kW, and expandable output up to 21.6kW with additional units, the DELTA Pro Ultra can handle the demands of energy-intensive devices, such as a 3-ton central air conditioner, water heaters, and dryers. This adaptability makes it a fitting solution for virtually every appliance in your home, ensuring that your house remains comfortable and operational, even during extended power outages.

The inclusion of a 30A, 240V socket further extends this versatility, allowing for the direct connection of high-demand appliances. 

Design and Installation


The EcoFlow DELTA Pro Ultra has been designed to withstand a range of environmental conditions, as well as for ease of storage and use.

The stackable capability of its battery units not only allows for easy expansion of power storage and output, but also optimizes space, making it suitable for tight spaces like garages or utility closets.

In addition to its IP54 dustproof and splashproof rating, the DELTA Pro Ultra also uses EcoFlow’s proprietary ‘X-Cooling technology’, which ensures durability and reliability under various conditions, including extreme weather and temperatures ranging from -4°F to 113°F. 


When it comes to installation, especially for those selecting the optional Smart Home Panel 2, professional assistance is required to ensure the system is correctly set up and integrated. 

EcoFlow is currently providing complimentary installation consultation – usually costing $99 – to help customers find qualified electricians for the actual setup. For residents in California and Texas, however, the installation service (including both consulting and the physical installation by a professional) is fully covered by EcoFlow, facilitating a smooth transition to the DELTA Pro Ultra with the Smart Home Panel 2. 

Whilst not quite as complicated, the basic version of the DELTA Pro Ultra (without Smart Home Panel 2) obviously still requires some installation considerations. Setting up the system properly in your home’s electrical environment may benefit from professional input. EcoFlow offers guidance and support for these installations, helping to ensure that users can maximize the system’s performance and adapt it effectively to their specific energy requirements.

Purchase Options and Add-Ons


The DELTA Pro Ultra can be purchased as 3 distinct bundles: 

  • Starter Kit: The most basic bundle, which is the core offering of the 1x DELTA Pro Ultra Battery Unit and 1x Inverter, offering 6kWh of power and 7200W output (suitable for powering a 3-ton central air conditioner). This kit is ideal for those looking to get started with a powerful whole-house backup system. Additional batteries can be purchased for expanded storage.

  • Intelligent Kit: This bundle consists of the Starter Kit with the EcoFlow Smart Home Panel 2 added on, providing not only 6kWh of power and 7200W output, but also smart energy management capabilities for total power control. This kit is perfect for users who want advanced control over their power backup system. Extra batteries are available for those requiring more power storage.

  • Hassle-Free Kit: Available exclusively for customers in California and Texas, this kit includes everything in the Intelligent Kit plus the cost of installation, making it a complete, worry-free power solution. It offers 6kWh of power and 7200W output along with the convenience of professional installation. This option is designed for those who prefer a straightforward setup without the hassle. As with the other kits, additional batteries can be added for increased capacity.

Optional Add-Ons 

If the three bundle options above aren’t exactly what you’re looking for, you also have the option to customize your purchase for your own specific requirements, giving you the option to purchase the core offering (1x Battery and 1x Inverter) and add on the Smart Home Panel 2, as well as any of the following options: 

  • Transfer Switch 306A: For pairing with a single DELTA Pro Ultra unit, providing a 125/250v connection with a 30A rating for efficient power transfer.
  • Transfer Switch A510A: For connecting two DELTA Pro Ultra units, providing a 125/250v connection with a 50A rating to handle higher power demands.

  • 400W Portable Solar Panel: Add on one or more 400W solar panels for solar charging, with up to 23% efficiency. These panels have a durable design, with an adjustable angle for optimal sun exposure, a one-piece folding design for portability, and an IP68 waterproof rating.

  • 50 Amp Hub: Enables the connection of two EcoFlow DELTA Pro Ultra Inverter units, expanding your system’s power capacity and versatility.

  • PowerInsight: Add on a 10″ interactive screen for smart home control, including temperature auto-adjustment and control over your EV charger, enhancing your home energy management.

  • EV X-Stream Adapter: Allows charging of the EcoFlow DELTA Pro Ultra at level 2 AC EV charging stations nationwide, expanding your charging options.

  • AC Generator Charging Adapter: Enables charging of the EcoFlow DELTA Pro Ultra with a gas generator via a NEMA L14-30R port. For extended distances, pair with an EcoFlow NEMA L14-30R to L14-30P Generator Cord (1.5 m / 5 ft).

User Feedback: Pros and Cons

We strongly believe in the importance of sourcing a range of customer feedback and reviews in order to provide you with unbiased information to inform your purchase decision. The following points came up in the reviews: 

Key Comments and Takeaways

  • One user mentioned the 30A capacity was insufficient for their high-energy household, suggesting a preference for higher amperage.
  • Installation of the Smart Home Panel could deter some electricians due to its complexity; however, the user eventually managed to find a competent contractor.
  • Battery degradation over time is mentioned a lot, indicating the need for future additional battery purchases.
  • It is recommended to include solar panels in the purchase for “regular use”, or as a supplement, to reduce energy costs.
  • It is particularly useful for those considering whole-home backup systems for areas prone to natural disasters, or those seeking energy independence. 
  • The combination of Delta Pro Ultra with the Smart Home Panel 2 offers a comprehensive and sophisticated home backup solution, enhancing home energy management and savings on electricity bills.
  • Its use extends beyond emergency backup, offering portability and flexibility for various uses including outdoor and off-grid activities.
  • One individual questioned why anyone would want to purchase the DELTA Pro Ultra when it’s effectively a generator that needs to be charged with another generator. 
  • Integrating this power system into your house effectively changes your entire home. 


  • High Capacity and Scalability: The system’s 6kWh – 90kWh expandable capacity supports long-term power needs. 
  • Versatile Output: Ranging from from 7.2kW – 21.6kW, its power output is suitable for various household appliances including air conditioning.
  • Solar Integration: Offers 5.6kW – 16.8kW solar input for efficient charging and can directly power devices, reducing electricity costs.
  • Advanced Energy Management: Features EcoFlow Smart Home Panel 2 for rapid automatic switchover, remote control via an app, and optimization of power usage.
  • Customization and Flexibility: Modular design allows easy system expansion and adaptation to changing power needs.
  • Portability: Despite being a whole-house backup system, components like the battery are portable for use in different scenarios.


  • Expensive Initial Investment: Higher upfront cost compared to traditional backup solutions.
  • Complex Installation: Installation of the Smart Home Panel 2 may require a professional, presenting challenges for some users.
  • Potential for Overwhelming Software: The app’s complexity and technical nature may not be user-friendly for all, with a steep learning curve for some features.
  • Limited Circuit Control with Smart Home Panel 2: Only has space for twelve circuits, which might not suit larger homes or those looking for expansion. 

For an in-depth ‘review and testing’ video, we recommend this great YouTube video by Jasonoid. 

Summary: Is the EcoFlow DELTA Pro Ultra Right for You?

Deciding whether the EcoFlow DELTA Pro Ultra is the right choice for you hinges on several key factors including your energy needs and budget, as well as the frequency and duration of power outages in your area, and your the extent of your desire for energy independence.

This system is ideal for households in regions prone to frequent or prolonged power outages, offering robust backup to keep essential appliances running. Its high scalability makes it a fit for both small and large homes, with the capacity to expand from a base of 6kWh up to a very substantial 90kWh. This feature is particularly appealing for those seeking not just emergency backup but also a step towards energy independence, allowing integration with solar panels for sustainable power generation.

What are the Drawbacks?

The substantial upfront investment and the complexity of installation are important considerations. The DELTA Pro Ultra may require professional installation, certainly in the case for those opting for the complete home integration with smart energy management.

For those living in areas without frequent power disruptions or for whom a backup system is more of a convenience than a necessity, the cost and complexity of the system might outweigh the benefits.

Final Notes

In summary, the EcoFlow DELTA Pro Ultra stands out as an advanced, versatile solution well-suited to a variety of needs, from emergency preparedness to daily energy management and sustainability goals. Potential buyers should weigh the system’s capacity and features against their specific needs, energy consumption patterns, and budget. For those in disaster-prone regions, or those seeking to enhance their home’s energy independence, the DELTA Pro Ultra is a powerful, albeit premium, option.

Solar Trek is all about breaking down information about solar-powered brands and products into a helpful, easily digestible format. All of our content is totally objective, aimed at helping you to make the best purchasing decisions for your solar needs. If you click our links and make a purchase, we may earn some commission at absolutely no extra cost to you, but this does not interfere with our goals of providing 100% helpful, informative, and objective information.


Anna is one of the Solar Trek founders and content contributors. Armed with a degree in Natural Sciences from the University of Bath and a passion for renewable technology; when she's not writing blog posts, Anna can be found traversing the globe, carving down ski slopes, or out walking with her beloved golden retriever.