- EcoFlow’s Best Solar Inverter Generators
- Best for Basic Home Backup: EcoFlow DELTA 2 Max + 220W Solar Panel
- Best Expandable Option: EcoFlow DELTA 3 + 220W Solar Panel
- Best Affordable, Whole Home Backup: EcoFlow DELTA Pro + 400W Solar Panel
- Best for Maximizing Solar Generation and Power Output: EcoFlow DELTA Pro 3 + 400W Solar Panel
- Best Energy Storage System for Home Energy Independence: EcoFlow OCEAN Pro
- EcoFlow OCEAN Pro Specifications
- What To Consider When Choosing a Solar Battery Backup System
- Frequently Asked Questions
- Final Thoughts
5 Best Solar Battery Backup Systems for Home
- EcoFlow’s Best Solar Inverter Generators
- Best for Basic Home Backup: EcoFlow DELTA 2 Max + 220W Solar Panel
- Best Expandable Option: EcoFlow DELTA 3 + 220W Solar Panel
- Best Affordable, Whole Home Backup: EcoFlow DELTA Pro + 400W Solar Panel
- Best for Maximizing Solar Generation and Power Output: EcoFlow DELTA Pro 3 + 400W Solar Panel
- Best Energy Storage System for Home Energy Independence: EcoFlow OCEAN Pro
- EcoFlow OCEAN Pro Specifications
- What To Consider When Choosing a Solar Battery Backup System
- Frequently Asked Questions
- Final Thoughts
Your home deserves a reliable, clean solar battery backup system to keep it up and running when the grid gives out, or a unique situation calls for additional power. Solar inverter generators are an excellent choice for modern power consumers, as they generate energy using the sun and provide eco-friendly off-grid electricity.
Choose one of these five best solar battery backup systems to set your home up for comfort and success and experience the difference firsthand.
EcoFlow’s Best Solar Inverter Generators
Best for Basic Home Backup: EcoFlow DELTA 2 Max + 220W Solar Panel
Best Expandable Option: EcoFlow DELTA 3 + 220W Solar Panel
Best Affordable, Whole Home Backup: EcoFlow DELTA Pro + 400W Solar Panel
Best for Maximizing Solar Generation and Power Output: EcoFlow DELTA Pro 3 + 400W Solar Panel
Best Energy Storage System for Home Energy Independence: EcoFlow OCEAN Pro
Best for Basic Home Backup: EcoFlow DELTA 2 Max + 220W Solar Panel
The EcoFlow DELTA 2 Max + 220W Solar Panel is designed as an entry-level home backup solution to meet high-capacity needs. It’s perfect for situations that require more power, like prolonged outages. It also features enhanced features, such as an expandable battery capacity, reliable LFP chemistry, and connectivity to both Bluetooth and WiFi.
It’s a good starter option for those who don’t want to commit to a considerable investment or give up a lot of storage space. This solar generator features a space-saving design that is small enough to fit in tight spaces without compromising on power when needed.
Its robust nature makes it capable of powering multiple heavy-duty appliances simultaneously with a 2.4kW continuous output and 3.4kW surge power. It can power many of EcoFlow’s advanced products, from the EcoFlow Glacier Portable Refrigerator to the EcoFlow Wave 3 Portable AC.
When you need to recharge the generator, you can utilize the rapid-charging solar panels, plug into AC power, or combine the two to experience the world’s fastest recharge, which takes just 43 minutes.
Are you concerned that you may need more power down the road than this basic option can provide? You can easily expand your setup with extra batteries and solar panels to meet your changing power requirements.
EcoFlow DELTA 2 Max Specifications
- Storage Capacity (Minimum): 2048 Wh
- Storage Capacity (Maximum): 6kWh
- AC Output (Maximum): 2.4kW continuous output (3.4kW surge)
- Solar Charge Capacity (Maximum): 11-60V 15A, single port 500W; dual port 1kW
- Weight: 50.7 lbs (23 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 Charger
- Multicharge Options? Yes
- 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
EcoFlow 220W Solar Panel Specifications
- Rated Power: 220W Front Side/155W Rear Side
- Efficiency: 22 % – 23 %
- Solar Cell Type: Monocrystalline
- Weight: 20.9 lbs (9.5 KG)
- Folded Dimensions: 32.3×19.7×1.3 in (82.0×50.0×3.2 cm)
- Unfolded Dimensions: 32.3×72.2×1.0 in (82.0×183.5×2.5 cm)
- Waterproof/Dustproof Rating: IP68
- Open CircuitVoltage: 21.8V (Vmp 18.4V)
- Short Circuit Current: 13A (lmp 12.0A) Front Side / 8.8 A (lmp 8.4A) Rear Side
- Recommended Portable Power Station: EcoFlow RIVER 2 Pro/EcoFlow DELTA 2
Pros
- Support all your devices at once
- Expand capacity as your needs grow
- Enjoy over a decade of regular use
- Recharge quickly using solar, AC, or a combination of the two
- Enjoy upgraded features
Cons
- Larger and heavier than the DELTA 2 model
- Expensive to expand capacity as needed
Best Expandable Option: EcoFlow DELTA 3 + 220W Solar Panel
If you want an option that starts with a reasonably smaller capacity while still granting you the capability of expanding capacity if needed, you’ll find your perfect match in the EcoFlow DELTA 3 + 220W Solar Panel. It comes with a 1kWh battery but can be expanded up to 5 kWh, making it ideal for home backup or other applications such as RV explorations or outdoor use.
With five potential recharge methods, you’ll never be without power. Use the 220W solar panel, which has optimal 99% MPPT efficiency and makes the most of the sun’s energy, connect to AC power, or leverage the multi-charging option to make the process even faster.
This durable home backup system was built to last up to six times longer than other options on the market. Thanks to the expertly chosen LFP battery, you’ll enjoy 10 years of daily use, and even then, you’ll still have 80% of its original capacity—that’s 3,000 power cycles.
An excellent choice for protection against unexpected outages, the EcoFlow DELTA 3 + 220W Solar Panel offers an actual uninterruptable power supply that meets data center standards (<10ms), protecting your delicate electronics like your home office computer or hard drive.
If you want to back up your appliances longer than this model supports, add the EcoFlow DELTA 3 Extra battery. Together, this system can support your appliances for hours or even a day or two.
EcoFlow DELTA 3 Specifications
- Storage Capacity (Minimum): 1024Wh
- Storage Capacity (Maximum): 5kWh
- AC Output (Minimum): 1800W total (X-Boost: 2200W, Surge 3600W)
- Solar Charge Capacity (Maximum): 2 ports, DC Charge Input, 11V-60V 500W Max
- Weight: 27.6 lbs (12.5 kg)
- Dimensions: 15.7 x 8 x 11.2 in (39.8 x .20.2 x 283.6 cm)
- Operating Noise Level: 600W<30db;1200W<40db
- Charging Options: Solar/AC/Car/Smart Generator 3000 (Dual Fuel)
- Multi-Charge Options? Yes
- Battery Chemistry: Lithium Iron Phosphate (LFP/LiFePO4)
- Cycle Life: 4000 Cycles to +/-80% Capacity
- Depth of Discharge: 100%%
- Warranty: Five years (no cycle life restrictions)
- App Monitoring and Control? Yes
EcoFlow 220W Solar Panel Specifications
- Rated Power: 220W Front Side/155W Rear Side
- Efficiency: 22 % – 23 %
- Solar Cell Type: Monocrystalline
- Weight: 20.9 lbs (9.5 KG)
- Folded Dimensions: 32.3×19.7×1.3 in (82.0×50.0×3.2 cm)
- Unfolded Dimensions: 32.3×72.2×1.0 in (82.0×183.5×2.5 cm)
- Waterproof/Dustproof Rating: IP68
- Open CircuitVoltage: 21.8V (Vmp 18.4V)
- Short Circuit Current: 13A (lmp 12.0A) Front Side / 8.8 A (lmp 8.4A) Rear Side
- Recommended Portable Power Station: EcoFlow RIVER 2 Pro/EcoFlow DELTA 2
Pros
- Expandable storage up to 5kWh
- Lightweight and compact home backup option
- Recharge from 0-100% in 56 minutes
- Quiet operation
- Safe for indoor use
Cons
- Can’t expand AC output
- Capacity can’t run multiple high-wattage appliances for extended periods
Best Affordable, Whole Home Backup: EcoFlow DELTA Pro + 400W Solar Panel
Need something to support the entire home but still protect your wallet? The EcoFlow DELTA Pro + 400W Solar Panel has what you want. Its robust power can keep your home running in a small and compact frame, including energy-intensive AC systems and high-wattage appliances.
This model is also expandable but on a much larger scale to support your entire home’s electricity needs. Get capacity up to 25kWh, and fear not whether it can support everything (or 99.9%) from your central heat to the refrigerator, laundry machines, lights, and electronics. Its robust capabilities make it a relief during long outages, knowing you’ll be covered even when your neighbors aren’t.
If you’re looking for a ticket to energy independence, this is it. Whether you need something reliable for your grid-connected home, off-grid tiny home, or RV, investing in the EcoFlow DELTA Pro + 400W Solar Panel will help you achieve it.
Thanks to top-tier construction and features, the recharges are quick, but the battery lifespan is long. LFP battery cell chemistry is the go-to option for modern electronics, providing superior safety, reliability, and lifetime use. You can recharge your devices quickly from the stored power or draw it directly from the solar panels—you can even use EV charging stations to top it off.
EcoFlow DELTA Pro Specifications
- Storage Capacity (Minimum): 3.6kWh
- Storage Capacity (Maximum): 25kWh
- AC Output (Maximum): 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/Smart Generator (Dual Fuel)
- 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
EcoFlow 400W Solar Panel Specifications
- Rated Power: 400W
- Efficiency: 22.6 %
- Solar Cell Type: Monocrystalline
- Weight: 35.3 lbs (16.0 KG)
- Folded Dimensions: 41.7×24.4×1.0 in (105.8×62.0×2.5 cm)
- Unfolded Dimensions: 41.7×93,1×1.0 in (105.8×236.5×2.5 cm)
- Waterproof/Dustproof Rating: IP68
- Open CircuitVoltage: 48V (Vmp 41V)
- Short Circuit Current: 11A (lmp 9.8 A)
- Recommended Portable Power Station: EcoFlow DELTA Series
Pros
- Enough power for your whole home
- Durable and heavy-duty
- Expandable up to 25kWh
- Control and monitor from the EcoFlow app
Cons
- Heavier and bulkier than other options
Best for Maximizing Solar Generation and Power Output: EcoFlow DELTA Pro 3 + 400W Solar Panel
Make the most of the solar energy available to you with the EcoFlow DELTA Pro 3 + 400W Solar Panel. The efficient panel will capture as much sunlight as possible and maximize the percentage of that light that gets converted into usable energy, while the EcoFlow DELTA Pro 3 Portable Power Station paired with it will store it securely to power your daily activities.
It’s the ideal system for the average US household or apartment, which uses about 30 kWh of electricity each day, according to the Residential Energy Consumption Survey (RECS). This battery backup system’s capacity is 3.6kWh and can be expanded up to 36kWh. It allows you to continue operating all your kitchen appliances, home office equipment, and home entertainment systems.
If needed, you can pair three of these models together, allowing you several ways to meet fluctuating consumption levels. You can connect it to an inverter generator like the EcoFlow Smart Generator 4000 or the EcoFlow Smart Home Panel for additional monitoring and control.
EcoFlow DELTA Pro 3 Specifications
- Storage Capacity (Minimum): 3.6kWh
- Storage Capacity (Minimum):4kWh per Battery. Up to 3 Batteries per DP3 (12kWh)
- Storage Capacity (Maximum):36kWh
- (Battery Storage) + 12kWh with a full Smart Generator 4000 (Dual Fuel) = 48kWh
- AC Output (Minimum): 4kW (6kW X-Boost/8kW Surge) (120/240V)
- AC Output (Maximum): Expandable to 8kW or 12kW by chaining 2 or 3 x DELTA Pro 3
- Solar Charge Capacity (Maximum): 2600W Dual-PV Charging (150V) per DP3
- Weight: 115 lbs (52kg)
- Dimensions: 27.5 × 13.5 × 16 in (69.5 × 34 × 41 cm)
- Operating Noise Level: 35 decibels
- Charging Options: Smart Home Panel 2 (7200W) / AC (3600W) / Dual Solar Input (2600W) / EV Charging (4000W) / Gas Generator (3200W) / Alternator Charging / Car Adapter Charging
- Multi-Charge Options? Yes – 18 Options
- Battery Chemistry: Lithium Iron Phosphate (LFP/LiFePO4)
- Cycle Life: 4000 Cycles to +/-80% Capacity (11+ years of regular use)
- Depth of Discharge: 100%
- Warranty: Five years (no cycle life restrictions)
- App Monitoring and Control? Yes
EcoFlow 400W Solar Panel Specifications
- Rated Power: 400W
- Efficiency: 22.6 %
- Solar Cell Type: Monocrystalline
- Weight: 35.3 lbs (16.0 KG)
- Folded Dimensions: 41.7×24.4×1.0 in (105.8×62.0×2.5 cm)
- Unfolded Dimensions: 41.7×93,1×1.0 in (105.8×236.5×2.5 cm)
- Waterproof/Dustproof Rating: IP68
- Open CircuitVoltage: 48V (Vmp 41V)
- Short Circuit Current: 11A (lmp 9.8 A)
- Recommended Portable Power Station: EcoFlow DELTA Series
Pros
- Highly expandable to maximize solar generation and output
- 7 methods for fast charging
- IP65 rated for indoor or sheltered outdoor use
- Quiet operation
- 10 ms UPS to protect delicate electronics
Cons
- Insufficient AC output for large homes and multiple occupants
- Requires recharging every 2-3 days when disconnected from panels
Best Energy Storage System for Home Energy Independence: EcoFlow OCEAN Pro
For homeowners who want complete energy freedom and top-quality performance, the EcoFlow OCEAN Pro is the best whole-home energy storage system available. This powerful system starts with 10kWh and can grow up to 80kWh, with strong power output of 24kW normal and 50kW peak to run your entire home including air conditioning, electric car charging, and all high-power devices at the same time.
Built tough for harsh weather, this system can handle floods up to 3.3 feet deep and works perfectly in heat up to 140°F. The built-in fire safety system and easy-to-expand design keep you safe and let you start small, then add more batteries as you need them. The smart AI helper learns your habits and cuts your electric bills by up to 40% automatically.
More than just backup power, the OCEAN Pro lets you sell extra energy back to the power company for extra money. The system includes expert installation, round-the-clock support, and a 15-year promise that gives you total peace of mind.
EcoFlow OCEAN Pro Specifications
Storage Capacity (Base): 10kWh per battery module
Storage Capacity (Maximum): 80kWh (8 stackable modules)
AC Output (Continuous): 24kW
AC Output (Peak): 50kW
Solar Charge Capacity (Maximum): 40kW PV input with 8 MPPT channels
Weight: 247 lbs per battery module / 152 lbs inverter
Dimensions: Battery: 51.9" × 43.3" × 10.4" / Inverter: 59.75" × 43.3" × 9.8"
Environmental Rating: IP67 (flood resistant to 3.3 ft, heat resistant to 140°F)
Charging Options: Solar/Grid/Gas Generator (multi-source integration)
Battery Chemistry: Lithium Iron Phosphate (LFP/LiFePO4)
Advanced Features: AI Assistant (ChatGPT), Fire Suppression, VPP Integration
Warranty: 15 years (battery and inverter)
Professional Support: 24/7 expert support with certified installation
Pros
Ultimate scalability from 10kWh to 80kWh capacity
Massive 24kW continuous, 50kW peak power output
AI-powered optimization reduces bills by up to 40%
Extreme durability with IP67 rating and fire suppression
Industry-leading 15-year warranty
Professional installation and 24/7 support
Energy independence with VPP capability
Customizable aesthetic options
Cons
Higher initial investment for professional-grade system
Large physical footprint for full system
What To Consider When Choosing a Solar Battery Backup System
Choosing the right solar battery backup system will ensure you have access to reliable power when you most need it. Your purchase should align with your energy needs, budget, and usage patterns. Here’s what to consider when deciding between the best solar generators.
Storage Capacity
Calculate your daily power consumption to determine how much electricity you need your backup to store. Factor in your most essential appliances and devices and determine whether your HVAC system will be included. Most residential homes require 10-20kWh of storage capacity for 24 hours of power for critical appliances.
Type of Battery Systems
Systems that use lithium-ion batteries perform superiorly, with longer lifespans and more expansive discharge abilities compared to other cell types, like lead-acid. EcoFlow’s modern options utilize LiFePO4 technology, which offers advanced safety and up to 10 years of regular use before reaching 80% original capacity.
Total Output/Power Requirements
Consider both continuous output power and surge requirements. Your ideal system can handle the combined running wattages of all your devices, plus additional startup surges from appliances with motors and compressors, such as fridges.
Charging Methods
Versatile charging keeps your systems ready to go. Look for systems that can recharge via solar panels, AC outlets, car charging, or a combination of these options. Combining charging methods can speed up recharges even further.
Performance and Lifespan
To reach 80% capacity, you’re looking for a system with a high cycle life of 3000 cycles or more. Certain features can help maintain performance further, such as temperature monitoring and tolerance, depth of discharge (how much battery power it can discharge to your devices), and warranty protection.
Another thing to look for is a battery management system that maintains performance and tracks system health to ensure the product works optimally for you.
Modularity and Expandability
A modular design allows you to use several batteries connected as one unit. Instead of one massive unit that may be too heavy to lift or too large to store in a residential home, you can instead keep several much smaller battery modules that can connect via cables to build a system that works together, making it easier to store, use, and adjust to reflect your current energy needs.
They allow you to customize your setup so it’s “just right” every time and prevent you from buying a new battery system entirely if your current one isn’t sufficient.
EcoFlow DELTA Pro Portable Power Station
Frequently Asked Questions
How Many Solar Batteries Are Needed to Power a Home?
The number of solar batteries needed to power your home depends on its size, the number of people living there, and the total wattage requirements of your appliances and systems like HVAC. Multiply the wattage x hours used for each appliance, then add up this number for all appliances and determine if you need more than one solar battery.
Final Thoughts
A solar battery backup system is one of the best investments you can make for your home and family. It reduces your dependence on the grid and provides peace of mind during power outages.
Choose from EcoFlow's range of solar generators to find the perfect system for your energy needs, space, and budget. From basic backup with the DELTA 2 Max to complete energy independence with the EcoFlow OCEAN Pro, there's a solution that fits your lifestyle and future power needs.