5 Best Solar Battery Storage Systems

In today’s increasingly eco-conscious world, having a reliable solar battery storage system is more than a convenience – it’s a must-have. Whether you aim to reduce your carbon footprint, ensure power during outages, or become more energy-independent, choosing the right system is crucial.

We’ll outline our top five solar battery storage systems, each designed to cater to different needs and lifestyles. From portable solutions for individual devices to robust systems for entire homes, discover which of our solar battery storage systems is your perfect companion for powering a sustainable future. 

EcoFlow’s Top Battery Storage Systems

  1. Best for Powering Devices: EcoFlow RIVER 2 
  2. Best for Outdoor Use: EcoFlow RIVER 2 Pro
  3. Best for Entry-Level Use: EcoFlow DELTA 2
  4. Best Expandable Option: EcoFlow DELTA Max 2000 
  5. Best Whole Home Option: EcoFlow DELTA Pro 

Best for Powering Devices: EcoFlow RIVER 2

The EcoFlow RIVER 2 is an exemplary choice for those seeking a reliable power source perfect for charging a wide range of devices. Its compact form and light weight make it an ideal portable power station for those needing to keep their gadgets charged while on the move. Whether you’re a traveller needing to power cameras and smartphones, a camper relying on GPS and lighting, or someone who enjoys outdoor gatherings with music and entertainment, the RIVER 2 can easily meet your needs.

Its compatibility with up to 110W solar panels allows for sustainable off-grid charging, ensuring your devices remain powered without relying on traditional power sources. The fast recharge capability, which is significantly quicker than industry standards, means minimal downtime for your devices, and the RIVER 2’s X-Boost technology enables you to power devices up to 600W, offering versatility beyond just charging and accommodating a broader range of electronic equipment. This adaptability makes the EcoFlow RIVER 2 a top-tier choice for those prioritising device functionality and energy independence in various outdoor and travel scenarios. 


  • Storage Capacity: 256Wh
  • AC Output: 300W total (surge 600W)
  • Solar Charge Capacity (Maximum): 11-30V, 8A, 110W Max
  • Weight: 7.7 lbs (3.5 kg)
  • Dimensions: 9.6 x 8.5 x 5.7 in (245 x 214 x 142 mm)
  • Operating Noise Level: ~60 decibels
  • Charging Options: Solar/AC/Car/USB-C Charging
  • Battery Chemistry: Lithium Iron Phosphate (LFP/LiFePO4)
  • Depth of Discharge: 100%
  • Warranty: 5 years


  • Ultra-fast recharge time ensures your power station is ready when you are.
  • A lightweight and portable design ideal for outdoor activities and travel.
  • Versatile charging options, including solar, provide convenience and flexibility.
  • Advanced battery management systems enhance safety and longevity.
  • X-Boost technology allows for powering devices up to 600W, expanding usability.


  • Limited storage capacity might not suit long-duration off-grid activities.
  • Higher power-consuming devices may quickly deplete the battery.

Best for Outdoor Use: EcoFlow RIVER 2 Pro

The EcoFlow RIVER 2 Pro is the quintessential power solution for outdoor enthusiasts who demand robust and reliable energy support in various environments. Tailored for the great outdoors, this power station is highly durable and boasts a significant energy capacity to handle multiple devices simultaneously, making it perfect for camping, RVing, or any outdoor event.

Its 768Wh capacity ensures ample power for essential electronics like portable fridges, lights, and cooking devices, further enhancing your outdoor experience. The ability to charge through solar panels makes the RIVER 2 Pro an eco-friendly companion that harnesses natural energy, providing sustainability and independence from traditional power sources.

The RIVER 2 Pro’s rugged design is built to withstand the challenges of outdoor use, offering peace of mind regardless of location. With the added flexibility of multiple charging options, including solar, AC, and car, you’re guaranteed a continuous power supply, ensuring your adventures are never cut short due to energy constraints. Whether at a remote campsite or amid an outdoor festival, the EcoFlow RIVER 2 Pro is your reliable power anchor, empowering your outdoor lifestyle conveniently and efficiently. 


  • Storage Capacity: 768Wh
  • AC Output: 800W total (surge 1600W)
  • Solar Charge Capacity (Maximum): 11-50V 13A, 220W Max
  • Weight: 17.2 lbs (7.8 kg)
  • Dimensions: 10.6 x 10.2 x 8.9 in (270 x 260 x 226 mm)
  • Operating Noise Level: ~60 decibels
  • Charging Options: Solar/AC/Car/USB-C Charging
  • Battery Chemistry: Lithium Iron Phosphate (LFP/LiFePO4)
  • Depth of Discharge: 100%
  • Warranty: 5 years


  • High storage capacity, suitable for powering multiple devices or more demanding equipment.
  • Diverse charging options, including eco-friendly solar charging, provide versatility in various outdoor settings.
  • Rugged and durable design ensures reliability in different outdoor environments.
  • Rapid recharge rate minimises downtime, enhancing outdoor convenience.
  • Supports a wide range of devices with its substantial power output, accommodating diverse outdoor energy needs.  


  • Heavier weight compared to smaller models, which could impact portability.
  • Larger size may require more storage space, which is a consideration for limited-space outdoor activities.
  • The higher capacity and features come at a higher price point, which may not suit all budgets.

Best for Entry-Level Use: EcoFlow DELTA 2

The EcoFlow DELTA 2 is an excellent entry-level power solution, perfectly designed for those new to solar battery storage systems or seeking a dependable home backup. It’s an ideal fit for families on extended road trips, providing a sense of security and autonomy by ensuring power needs are met without interruption. Its expandable storage capacity distinguishes it in versatility, allowing users to scale up their power reserves to match their growing energy demands.

With compatibility for up to 400W solar panels, the DELTA 2 offers a powerful solution, allowing you to harness the sun’s power for an eco-friendly energy solution. This feature particularly benefits those looking to reduce their carbon footprint while maintaining a reliable power source. Integrating with DELTA 2 Extra Battery or DELTA Max Extra Battery further enhances its flexibility and expandability, making it a future-proof choice for users anticipating an increase in power requirements.

Whether it’s for home backup during outages, powering devices on a family road trip, or as a starting point in solar power storage, the EcoFlow DELTA 2 offers simplicity without compromising on performance, making it a top recommendation for beginners or those seeking a straightforward, effective power solution.


  • Storage Capacity (Minimum): 1024Wh
  • Storage Capacity (Maximum): 3kWh
  • AC Output (Minimum): 1.8kW continuous output (2.7kW Surge)
  • 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


  • Ideal for beginners with its easy setup and user-friendly interface.
  • Expandable storage capacity allows for increased power reserves as needed.
  • Compatible with a wide range of solar panels for flexible, eco-friendly charging.
  • Offers a reliable home backup solution, ensuring peace of mind during power outages.
  • Portable design makes it suitable for road trips, providing power on the go.


  • Base storage capacity might require expansion for more demanding power needs.
  • As an entry-level unit, it may lack some advanced features in higher-end models.
  • While portable, its size and weight might be a consideration for those with limited space.

Best Expandable Option: EcoFlow DELTA Max 2000

The EcoFlow Delta Max 2000 is optimal for users seeking an expandable home backup solution that combines affordability with high performance. Unique in its use of nickel-cadmium (Ni-Cad) batteries, the DELTA Max 2000 offers a distinctive alternative in the portable power station market while providing the durability and reliability necessary for these devices. This system is adept at scaling up and is compatible with additional batteries and solar input to enhance its utility during extended power outages or for more demanding home energy needs.

With the capacity to expand from 2kWh to 6 kWh, the DELTA Max 2000 ensures your essential devices always remain operational, offering peace of mind during unforeseen power disruptions. Its compatibility with up to 800W of solar input and various charging methods highlights its versatility, making it a robust solution for maintaining continuous power supply. Whether you’re looking to back up your home or require a scalable power solution, the DELTA Max 2000 stands out for its expandability, allowing you to tailor your power reserves to your specific needs. 


  • Storage Capacity (Minimum): 2016kWh
  • Storage Capacity (Maximum): 6kWh
  • AC Output: 6kWh
  • 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 Charging
  • Battery Chemistry: NCM (Nickel Cadmium)
  • Cycle Life: 800 Cycles to 80%+ Capacity
  • Depth of Discharge: 80%
  • Warranty: 24 months + 12 (Registration for warranty extension)
  • App Monitoring and Control? Yes


  • Expandable capacity catering to a range of energy requirements.
  • Fast charging capabilities offer a robust and reliable power source.
  • Compatible with a broad array of additional power sources, including solar panels and smart generators.
  • Offers a versatile and cost-effective solution for home backup and emergency power needs.


  • Ni-Cad batteries may not offer the same performance as LiFePO4 alternatives.
  • The initial 2kWh capacity may require immediate expansion for more intensive use.
  • While offering multiple charging options, the setup for maximising charging efficiency might be complex for some users.

Best Whole Home Option: EcoFlow DELTA Pro

The EcoFlow DELTA Pro is the ultimate portable power station designed to deliver comprehensive whole-home backup power. With an expandable capacity of up to 25kWh and a robust 3600W to 7200W AC output, it’s engineered to efficiently power nearly all household appliances efficiently. This makes it an ideal solution for substantial power needs, from emergency home backup to off-grid living and everything in between.

Offering unparalleled versatility, the DELTA Pro can be paired with up to 8 x 400W rigid solar panels, maximising renewable energy and sustainability. Its compatibility with the DELTA Pro Smart Extra Batteries, Smart Generator Dual Fuel, Smart Home Panel, and Dual Voltage Hub further enhances its adaptability, providing a comprehensive energy solution that can be tailored to any home’s needs.

Whether you’re looking to secure your home’s power supply during outages, reduce your grid dependency, or ensure a reliable power source for remote living, the EcoFlow DELTA Pro offers the power and flexibility to meet a wide array of energy requirements. Its advanced features, including rapid charging and extensive compatibility with solar panels and additional power accessories, position it as a top-tier choice for whole-home power management. 


  • Storage Capacity (Minimum): 3.6kWh
  • 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


  • Expansive expandable capacity up to 25kWh, suitable for whole-home power needs.
  • High AC output capable of running 99% of household appliances.
  • Rapid charging and extensive solar panel compatibility offer efficient power replenishment.
  • Versatile and can be integrated with various EcoFlow accessories for a customised power solution.
  • Designed for portability, making it suitable for a wide range of applications from home backup to RV use.


  • The high capacity and features come with a significant investment.
  • Despite being portable, its size and weight may be challenging for some users to manage.
  • The complexity of maximising its full potential may require a learning curve for less tech-savvy users. 

What To Consider When Choosing the Best Solar Battery Storage System


Understanding the capacity of a solar battery storage system is essential to ensure it can effectively meet your energy requirements. The capacity dictates the amount of electricity the system can store or deliver, influencing how long you can power your devices and appliances during power outages or off-grid setups. To select the most suitable system, assess your typical energy consumption and consider potential future needs.

Opt for a system with a capacity that can handle your daily energy demands, providing a reliable power source for all your essential and non-essential devices. A system with adequate capacity can distinguish between a temporary solution and a sustainable, long-term energy strategy, repairing you for various scenarios, from unexpected power outages to planned off-grid adventures. 

Battery Chemistry

Battery chemistry is another foundational factor in a solar battery storage system’s performance, durability, and safety. Lithium Iron Phosphate (LiFePO4) batteries stand out for their stability, long life cycles, and eco-friendliness, making them a preferred choice for solar storage. They offer a higher energy density, fewer maintenance requirements, and better safety features compared to other battery chemistries, such as Nickel-Cadmium (Ni-Cad), which, while durable, may not offer the same efficiency or environmental benefits. 

When selecting your solar battery, consider the operational environment, expected lifespan, and energy efficiency. A battery with improved chemistries enhances your solar energy system’s overall efficacy and sustainability, ensuring reliable power storage and reducing the need for frequent replacements, thus offering better long-term value and performance. 


The warranty of a solar battery storage system isn’t just a policy but a testament to the manufacturer’s confidence in their product’s durability and performance. A robust warranty can safeguard your investment by covering potential defects and performance issues over time. When evaluating warranties, look beyond the length, scrutinise what’s covered, and be sure you understand the terms and conditions. 

A comprehensive warranty should offer protection against capacity loss, manufacturing defects, and premature failure. It also reflects the battery’s expected lifespan and a manufacturer’s commitment to their product’s reliability. Opting for a system with a strong warranty can provide peace of mind, ensuring your solar battery storage system remains a reliable and effective energy solution for years to come while also offering insights into the expected maintenance and longevity of the product. 


When considering a solar battery storage system, consider the potential for future expandability to ensure it can adapt to your evolving energy needs. An expandable system allows you to increase storage capacity or integrate additional power solutions over time, offering a scalable approach to energy management. This flexibility is particularly valuable if your energy consumption grows due to lifestyle changes, home additions, or increased reliance on renewable energy sources.

Choosing a system that supports expandability can prevent the need for a complete system overhaul in the future, providing a cost-effective way to enhance your energy storage capacity. Look for systems that allow easy integration with additional batteries or are compatible with other energy-generating sources. This will ensure your solar storage can grow in tandem with your energy requirements and continue to provide efficient, reliable power. 

Charging Options

The charging options available for a solar battery storage system play a critical role in its overall versatility and convenience. A system with multiple charging methods, including solar, AC, car, or USB-C, offers greater flexibility, allowing you to recharge the battery in various scenarios. This is particularly crucial in emergency situations or during off-grid adventures, where access to solar and traditional power sources may be limited. A system that can harness solar power efficiently is indispensable for sustainable energy use, but having alternative charging options ensures you can keep your system powered even when sunlight is scarce.

Additionally, the speed and efficiency of charging can significantly impact the usability of the system, so consider the charging times and practicality of each method. Opting for a solar battery storage system with diverse and efficient charging options ensures you can maintain a reliable power supply, no matter where you are or what the situation may be.  

Frequently Asked Questions

What Is the Best Battery To Store Energy From Solar Panels?

The EcoFlow DELTA Pro, with its Lithium Iron Phosphate (LiFePO4) battery, is the top choice for storing energy from solar panels. It offers extensive storage capacity, long life cycles, and high efficiency, ensuring reliable and sustainable energy storage for your solar power needs. 

Final Thoughts

Selecting the right solar battery storage system is pivotal for maximising energy independence and efficiency. Whether you need a compact solution for powering devices, a durable system for outdoor use, an entry-level option, an expandable unit, or a comprehensive whole-home backup, we offer a robust portable power station that can meet your needs. 

Explore our innovative range of Portable Power Stations to find the perfect fit for your energy requirements and embrace sustainable, reliable power today.

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.


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