3 Best Home Backup Systems for Long Power Failures


As power reliability remains considerably challenging, a robust home backup system is more important than ever. Today’s blog highlights the three best backup systems to ensure uninterrupted power even during prolonged outages.

Each system offers unique features, from entry-level convenience to whole-home coverage, tailored to diverse needs and scenarios. Understanding your options will empower you to choose a backup solution that provides peace of mind and energy security during unexpected power failures. 

EcoFlow’s Best Home Backup Systems for Long Power Failures in 2024

  1. Best for Entry-Level Home Backup: EcoFlow DELTA 2 + 400W Solar Panel
  2. Best for Home Backup Power Expansion: EcoFlow DELTA Max + 400W Solar Panel
  3. Best Whole Home Power Backup for Home: EcoFlow DELTA Pro + 400W Solar Panel

Best for Entry-Level Home Backup: EcoFlow DELTA 2 + 400W Solar Panel

For those new to home backup systems or seeking a reliable, user-friendly solution, the EcoFlow DELTA 2 + 400W Solar Panel is an excellent choice. This solar generator bundle integrates into any home, ensuring a steady power supply during outages or off-grid adventures. Its capability to expand from 1kWh to 3kWh makes it a versatile option for growing energy needs.

With its rapid dual-charging feature, the EcoFlow DELTA 2 recharges swiftly, ensuring you’re never long without power. Its impressive 1800W AC output can support over 90% of home appliances, making it an ideal companion for unexpected blackouts or outdoor activities. The EcoFlow DELTA 2’s ease of use and expandable capacity position it as a top-tier entry-level backup energy solution, offering peace of mind and convenience in any scenario. 


  • Storage Capacity (Maximum): 3kWh
  • AC Output (Minimum): 1.8kW continuous output (2.7kW Surge)
  • AC Output (Maximum): EMPTY
  • Solar Charge Capacity (Maximum): 11-60V, 15A, 500W max
  • Weight: 27 lbs (12 kg)
  • Dimensions: 15.7 x 8.3 x 11.1 in (40 x 21.1 x 28.1 cm)
  • Operating Noise Level: ~50 decibels
  • Charging Options: Solar/AC/Car Charger
  • Battery Chemistry: Lithium Iron Phosphate (LFP/LiFePO4)
  • Cycle Life: 3000 Cycles to +/-80% Capacity
  • Depth of Discharge: 100%
  • Warranty: Five years (no cycle life restrictions)
  • App Monitoring and Control?: Yes
  • Federal Solar Tax Credit Eligibility?: No


  • Expandable Capacity: Starts at 1kWh and is expandable up to 3kWh for growing energy requirements.
  • Rapid Charging: Charges up to 80% in just 50 minutes, ensuring quick readiness.
  • High Compatibility: Powers over 90% of home appliances with a robust 1800W output.
  • Durable Solar Panels: Tempered glass panels withstand harsh conditions.


  • Size and Portability: While portable, the size may be a constraint for some users.
  • Investment for Expansion: Additional cost for expanding capacity with extra batteries. 

Best for Home Backup Power Expansion: EcoFlow DELTA Max + 400W Solar Panel

The EcoFlow DELTA Max + 400W Solar Panel is the premier choice for individuals expanding their home backup power capabilities. This system is designed for more demanding energy needs, efficiently supporting your home and appliances during prolonged outages. Its expandable capacity, reaching up to 6kWh with additional smart batteries, ensures that your essential appliances remain operational during more extended blackout periods.

The EcoFlow DELTA Max is not just about capacity; its rapid dual charging ability minimizes downtime, while the X-Boost technology allows it to handle heavy-duty devices up to 3400W. When paired with high-efficiency EcoFlow 400W solar panels, it offers an eco-friendly and dynamic solution to keep your home powered without conventional energy sources. This combination is ideal for those seeking reliable, expandable, and versatile home backup power. 


  • Storage Capacity (Minimum): 1612 Wh
  • Storage Capacity (Maximum): 2.8 kWh
  • AC Output: 2kW continuous output (5kW Surge)
  • Solar Charge Capacity (Maximum): 800W Max (11-100V 13A)
  • Weight: 48 lbs (22 kg)
  • Dimensions: 19.6 × 9.5 × 12 in (49.7 × 24.2 × 30.5 cm)
  • Operating Noise Level: ~50 decibels
  • Charging Options: Solar/AC/Car/USB-C/USB-A Charging
  • Battery Chemistry: NCM  (Nickel Cadmium)
  • Cycle Life: 500 Cycles to 80%+ Capacity
  • Depth of Discharge: 80%
  • Warranty: 24+12 (Registration for warrant extension)
  • App Monitoring and Control?: Yes
  • Federal Solar Tax Credit Eligibility?: No


  • Expandable Capacity: Ranges from 2kWh to 6kWh, accommodating more extensive power needs.
  • Rapid Dual Charging: Achieves 0-80% charge in 65 minutes.
  • High Power Output: Capable of powering heavy-duty appliances with X-Boost technology.
  • Versatile Charging Options: Includes AC, car, solar, and Smart Generator charging.
  • Smart Solar Efficiency: Utilizes MPPT algorithm for optimal solar energy use.


  • Size and Weight: Reduced portability due to its larger size.
  • Initial Investment: Greater upfront cost due to extended capacity and features.

Best Whole Home Power Backup for Home: EcoFlow DELTA Pro + 400W Solar Panel

The EcoFlow DELTA Pro + 400W Solar Panel offers the ultimate solution to ensuring uninterrupted energy for your entire home. This system caters to the comprehensive energy needs of a household, making it the best choice for whole-home power backup. The EcoFlow DELTA Pro boasts a remarkable expandable capacity, reaching up to 25 kWh. Its extensive storage capacity and the option to integrate directly with home circuits offer unparalleled power, security, and independence.

The EcoFlow DELTA Pro is equipped to run a wide range of household appliances, from regular home electronics to heavy-duty devices, thanks to its robust AC output. Coupled with EcoFlow 400W Solar Panels, this system ensures reliability and promotes an eco-friendly approach to energy consumption. In short, this system is your comprehensive energy management solution, offering peace of mind and independence for your entire home.


  • Storage Capacity (Maximum): 25kWh
  • AC Output (Minimum): 3.6kW continuous output (7.2kW Surge) 
  • AC Output (Maximum): Expandable to 7.2kW continuous output (14.4 kW surge) with 2 x EcoFlow DELTA Pro + Double Voltage Hub
  • Solar Charge Capacity (Maximum): 3.2kW with 2 x EcoFlow DELTA Pro (16 x 400W Rigid Solar Panels)
  • Weight: 99 lbs (45kg)
  • Dimensions: 25 x 11.2” x 16.4” inches (63.5 x 28.4x 42cm)
  • Operating Noise Level: ~50 decibels
  • Charging Options: Solar/AC/Car Charger/Smart Home Panel/EV Charge Station
  • Battery Chemistry: Lithium Iron Phosphate (LFP/LiFePO4)
  • Cycle Life: 3000 Cycles to +/-80% Capacity
  • Depth of Discharge: 100%
  • Warranty: Five years (no cycle life restrictions)
  • App Monitoring and Control?: Yes
  • Federal Solar Tax Credit Eligibility?: Yes, with Solar Panels*

*Eligibility based on current Internal Revenue Service Guidelines for the Residential Clean Energy Credit. Subject to change and individual eligibility. Consult a tax professional before making a purchase.


  • Exceptional Expandability: Up to 25kWh capacity for whole home coverage.
  • Power Output: 3600W-7200W output, ideal for running heavy-duty appliances.
  • Fastest Charging: Industry-leading MultiCharge capability up to 6500W.
  • Smart Home Integration: Seamlessly integrates with home circuits for efficient power management.


  • Size and Portability: Larger size may impact portability and placement.

How Do Backup Power Systems Work?

Understanding backup power systems is essential for anyone evaluating a reliable energy solution. These systems provide electricity during power outages, ensuring your home or workplace continues to function smoothly. A backup power system typically includes a power station and energy sources, such as solar panels or generators.

When the main power supply fails, the backup system kicks in. If it’s solar-powered, it draws energy from the sun, storing it in a battery. This stored energy converts from Direct Current (DC) to Alternative (AC), the electricity most household appliances use. The system automatically switches to this stored energy to keep your devices running and can be monitored from mobile apps or other online platforms. 

Backup power systems are not just reactive; they’re proactive. With innovative technology, these systems can manage energy usage, prioritize specific devices, and even recharge when the sun is out or during off-peak hours to ensure maximum efficiency. This effortless transition between power sources makes modern backup systems a great choice, regardless of your specific needs. 

How Long Will the Backup System Run When There Is a Power Failure?

The duration a backup system can sustain an energy supply depends on the system’s energy storage capacity and the power demands of connected appliances. Generally, the larger the backup system’s battery capacity, the longer it can provide energy.

For instance, a system with a high-capacity battery can run essential home appliances for hours or even days, depending on usage habits. The more devices connected and the higher their energy consumption, the quicker the battery will deplete. While the run time of backup systems varies, EcoFlow’s innovative and expandable solutions are engineered to provide reliable and extended power support, ensuring you remain connected and functional during those critical times.

Appliance Compatibility

Understanding which appliances can run by a backup power system safely and effectively is crucial. Here’s a short list of items that you can and cannot use with a backup power system:

What Appliances Can You Run On a Backup Power System?

  • Refrigerators
  • LED Lighting
  • Televisions
  • Laptop Computers
  • Mobile Phones and Chargers
  • Fans
  • Microwave Ovens
  • Wi-Fi Routers
  • Medical Devices
  • Coffee Makers
  • Small Heaters
  • Toasters
  • Washing Machines

What Appliances Should Not Be Powered by a Backup Power System?

  • Large Electric Heaters
  • Central Air Conditioning Units
  • Traditional Electric Ovens
  • Clothes Dryers
  • Hot Tubs
  • Sump Pumps
  • Large Power Tools

What To Consider When Shopping for the Best Home Backup Systems for Long Power Failures

Power Capacity and Output

When choosing a home backup system, consider the power capacity and output first, as selecting a system with enough capacity to meet your needs during lengthy power failures is essential. The capacity, usually measured in kilowatt-hours (kWh), determines how many appliances you can run and for how long. Additionally, the power output, measured in watts (W), indicates the strength of the system to handle the simultaneous running of multiple appliances. Balancing capacity with output ensures your critical devices stay powered during extended outages.


Expandability is a crucial feature for backup systems, especially for future-proofing your power needs. Systems with expandable capabilities allow you to add extra batteries or solar panels, increasing energy storage and generation. This adaptability is vital for accommodating growing energy demands or extending backup power duration. When shopping, look for systems that offer easy expansion options to ensure your backup solution can evolve alongside your power requirements.

Portability and Installation

Portability and ease of installation are integral, especially if you plan on using the backup system for various locations or outdoor activities. Systems with a compact design and manageable weight are advantageous for easy movement. Additionally, consider how straightforward the installation process is – a user-friendly system that requires minimal setup is ideal for most homeowners.

Speed and Charging Options

Charging options and speed are also critical for home backup systems. Look for systems offering multiple charging methods, including AC wall outlets, solar panels, and car charging. Fast charging capabilities are essential for quickly restoring energy to the unit between outages. A system that can recharge rapidly ensures a reliable power source is ready when you need it, minimizing downtime during prolonged power failures.

Durability and Weather Resistance

Durability and weather resistance are vital, particularly for systems that involve outdoor components like solar panels. Ensure the backup system is built to withstand various weather conditions, from intense sunlight to heavy rain. High-quality materials and robust construction contribute to the system’s longevity, ensuring your investment remains secure and functional over time. 

Frequently Asked Questions

What Is the Best Backup System for Power Outages?

The best backup system for power outages is one that matches your energy needs and usage patterns. Systems with high capacity, rapid charging, and multiple power output options are ideal. For comprehensive home coverage, consider a system with expandable capacity and solar panel compatibility for eco-friendly charging.

What Is the Best Backup Power Supply for a Home in South Africa?

A backup power supply offering reliability and adaptability to varying energy needs is paramount in South Africa. Look for systems with high-capacity batteries, solar charging capabilities, and robust construction to withstand local weather conditions. Expandability is also a key feature to accommodate future power requirements, where these devices and energy support are even more vital.

Final Thoughts

Selecting the proper backup power system for your needs involves considering factors like capacity, expandability, charging, portability, and durability. Consider our range of solar generators for their standout, innovative features that ensure reliable energy during outages, helping you upgrade your sustainable lifestyle. Find a sustainable and efficient solution that keeps your home powered and prepared during prolonged blackout periods.

EcoFlow is a portable power and renewable energy solutions company. Since its founding in 2017, EcoFlow has provided peace-of-mind power to customers in over 85 markets through its DELTA and RIVER product lines of portable power stations and eco-friendly accessories.

Share this article

Thanks for joining us!
A surprise is waiting for you in your inbox.
Please check your email.

Popular posts



Please enter your comment!
Please enter your name here