6 Best Solar Generators for Whole House Power Backup
The best solar generators for whole house backup depends on your needs. The EcoFlow DELTA Pro Ultra with 12kWh is best for extended power outages with its massive 90kWh expandability, while the GROWATT HELIOS 3600 excels at budget-conscious whole-home backup with 240V capability. For portable whole-house power, the EcoFlow DELTA Pro 3 stands out with its 10ms switchover and whisper-quiet operation.
Choosing a solar generator for your entire home requires careful consideration of capacity, output power, and expandability. Unlike portable units designed for camping, whole-house systems need enough juice to run major appliances like air conditioners, water heaters, and refrigerators for days at a time.
Quick Comparison Table
| Product | Battery Capacity | AC Output | Max Expandable | Voltage Support | UPS Switchover |
|---|---|---|---|---|---|
| EcoFlow DELTA Pro 3 | 4096Wh | 4000W (6000W boost) | 48kWh | 120V/240V | 10ms |
| EcoFlow DELTA Pro w/400W Panel | 3600Wh | 3600W (4500W boost) | 25kWh | 120V | Yes |
| GROWATT HELIOS 3600 | 3686Wh | 3600W (4500W boost) | 36kWh | 120V/240V upgradable | 15ms |
| EcoFlow DELTA Pro Standalone | 3600Wh | 3600W (4500W boost) | 25kWh | 120V | Yes |
| EcoFlow Pro Ultra + Panel 2 | 6144Wh | 7200W | 90kWh | 120V/240V | 20ms auto |
| EcoFlow Pro Ultra 12kWh | 12kWh | 7200W (21.6kW max) | 90kWh | 120V/240V | 20ms auto |
Best Solar Generators for Whole House
1. EcoFlow DELTA Pro 3 with 2X400W Panels – Ultimate Portable Whole-House Solution
Best for: Homeowners who want plug-and-play whole-house backup with the quietest operation and fastest switchover time.
Key Features:
| Feature | Details |
| Battery Type | LFP 4096Wh capacity |
| AC Output | 4000W (6000W X-Boost) |
| Voltage | 120V/240V dual support |
| Noise Level | 30dB whisper-quiet |
| Switchover Speed | 10ms ultra-fast UPS |
The EcoFlow DELTA Pro 3 is the best solar generator for homeowners seeking hassle-free whole-house backup with premium features. This system comes with two 400W portable solar panels and supports both 120V and 240V output for running heavy appliances like central air conditioners.
The LFP battery technology ensures long lifespan and safety, while the 4096Wh capacity expands to a massive 48kWh with additional batteries. The unit charges incredibly fast through multiple methods including AC outlets, solar panels, and EV charging stations.
What sets this apart is the X-Quiet technology that operates at just 30dB, quieter than a whisper. You can literally place it in your bedroom during a power outage without disturbing your sleep.
The 10ms switchover time protects sensitive electronics like NAS systems and servers from power interruptions. The EcoFlow app provides complete remote monitoring and control, making power management effortless even when you’re away from home.
This is the top choice for those who value convenience, quiet operation, and comprehensive whole-home protection without complex installation.
Pros:
- Whisper-quiet 30dB operation
- Lightning-fast 10ms UPS switchover
- True 120V/240V dual voltage
- Plug-and-play setup, no installation
Cons:
- Premium price point
- Smaller base capacity than Pro Ultra
2. EcoFlow DELTA Pro with 400W Solar Panel – Best Solar Bundle Value
Best for: Budget-conscious buyers who want a complete solar generator system with excellent charging efficiency right out of the box.
Key Features:
| Feature | Details |
| Battery Capacity | 3600Wh LFP battery |
| Solar Panel | 400W, 22.4% efficiency |
| Charging Speed | 1.8hrs full charge (240V) |
| Output Ports | 15 versatile outlets |
| Solar Recharge | 3.5hrs with 3x400W panels |
The EcoFlow DELTA Pro with 400W solar panel bundle is the best value package for those starting their solar backup journey. This complete system includes everything needed to harness solar power immediately.
The included 400W solar panel achieves 22.4% conversion efficiency and comes with an IP68 waterproof rating. It’s foldable and lightweight at just 35.3 pounds, making it easy to position for optimal sun exposure or take on camping trips.
With 3600Wh capacity and 3600W output (4500W with X-Boost), this unit powers most household appliances. The 15 output ports include 5 AC outlets, USB-A, USB-C, DC ports, and an Anderson connector for maximum versatility.
Fast charging is a standout feature, reaching full capacity in just 1.8 hours with 240V outlets. Solar charging takes 11 hours with one panel or 3.5 hours with three panels.
This bundle offers exceptional value for homeowners wanting immediate solar capability without buying components separately.
Pros:
- Complete solar system included
- High-efficiency 22.4% solar panels
- Ultra-fast 1.8hr AC charging
- IP68 waterproof solar panel
Cons:
- Ships in separate packages
- 120V only (no 240V)
3. GROWATT HELIOS 3600 – Best Budget Whole-House Generator
Best for: Cost-conscious homeowners who need expandable whole-house backup with 240V capability at an affordable entry price.
Key Features:
| Feature | Details |
| Capacity | 3686Wh LiFePO4 battery |
| Output Power | 3600W (4500W Watt+) |
| Expandability | Up to 36kWh/7200W |
| Output Ports | 16 versatile ports |
| Cold Start | Works down to -22°F |
The GROWATT HELIOS 3600 is the best budget-friendly solar generator offering true whole-house capability. At just $1,299, it delivers exceptional value with features typically found in much pricier units.
This system qualifies for the 30% federal tax credit, effectively reducing the cost even further. The 3686Wh LiFePO4 battery provides reliable, long-lasting power with 3600W output that expands to 4500W with Watt+ technology.
What makes this special is the ability to scale to a 240V system by connecting two units with a split-phase connector. This configuration delivers 7200W and up to 36kWh capacity, powering an entire home for 4-7 days.
The HELIOS 3600 includes Anderson ports for direct alternator charging and a NEMA TT-30 for RVs. The Cold Start feature ensures operation in extreme temperatures down to -22°F, making it reliable in harsh winter conditions.
For DIY enthusiasts and budget-conscious buyers, this offers unbeatable expandability and features at an accessible price point.
Pros:
- Exceptional price-to-performance ratio
- 30% federal tax credit eligible
- Expandable to 240V/7200W system
- Cold start down to -22°F
Cons:
- Requires second unit for 240V
- Slower 15ms UPS switchover
4. EcoFlow DELTA Pro Standalone – Best for Gradual System Building
Best for: Homeowners who want to start with a quality base unit and expand their system gradually over time.
Key Features:
| Feature | Details |
| Base Capacity | 3600Wh LFP battery |
| AC Output | 3600W (4500W X-Boost) |
| Expandability | 3.6kWh to 25kWh |
| Charging Methods | 5 different ways |
| Output Options | 15 ports total |
The standalone EcoFlow DELTA Pro is the best option for those who want flexibility to build their power system gradually. Starting at $1,399, this unit provides a solid foundation that grows with your needs.
The 3600Wh LFP battery delivers reliable power with 3600W output, expandable to 4500W with X-Boost technology. You can pair two units for 7200W output or add extra batteries and smart generators to reach 25kWh total capacity.
This model qualifies for the 30% Residential Clean Energy Credit, making it more affordable. The X-Stream fast charging technology fully recharges in just 1.8 hours with 240V outlets or 2.7 hours with standard outlets.
Five charging methods provide ultimate flexibility: EV station, solar panels, wall outlets, smart generators, or car outlets. The 15 output ports include USB-C 100W fast charging, perfect for modern devices.
This standalone unit offers the perfect entry point for homeowners who want proven EcoFlow quality with room to expand as budget allows.
Pros:
- Lower entry price point
- Highly expandable system
- Ultra-fast 1.8hr charging
- 30% tax credit eligible
Cons:
- No solar panels included
- Requires accessories for full capability
5. EcoFlow DELTA Pro Ultra with Smart Home Panel 2 – Best for Seamless Home Integration
Best for: Homeowners wanting professional-grade automatic backup with smart energy management and circuit prioritization.
Key Features:
| Feature | Details |
| System Capacity | 6144Wh base battery |
| Power Output | 7200W continuous |
| Max Expansion | Up to 90kWh |
| Auto Switchover | 20ms with Smart Panel |
| Smart Features | Circuit prioritization, load shifting |
The EcoFlow DELTA Pro Ultra with Smart Home Panel 2 is the best complete home integration system for serious backup power. This package includes the inverter, battery, and professional Smart Home Panel 2 for seamless installation.
The 6144Wh battery provides two days of essential power and recharges in just 2 hours. The 7200W output handles heavy appliances including 3-ton central air conditioners, with the ability to expand to 21.6kW with three inverters.
The Smart Home Panel 2 automatically switches to backup power within 20ms during outages, even when you’re away. The EcoFlow app lets you prioritize specific circuits, extending backup duration by focusing power where it’s needed most.
Smart energy management analyzes your usage patterns to offset peak rates and maximize solar savings. The X-Fusion feature maintains constant 7200W output even while charging.
This system represents the pinnacle of home solar backup, combining massive power, intelligent management, and professional-grade automation in one comprehensive package.
Pros:
- Complete professional installation system
- Automatic 20ms switchover
- Smart circuit prioritization
- Energy cost optimization
Cons:
- Higher upfront investment
- Ships in multiple packages
6. EcoFlow DELTA Pro Ultra 12kWh – Best Maximum Power System
Best for: Large homes or those needing maximum backup capacity with the ability to power everything simultaneously during extended outages.
Key Features:
| Feature | Details |
| Total Capacity | 12kWh (two batteries) |
| Power Output | 7200W (21.6kW max) |
| Maximum Expansion | 90kWh (15 batteries) |
| Backup Duration | 30+ days at 90kWh |
| Voltage Support | 120V/240V dual |
The EcoFlow DELTA Pro Ultra 12kWh system is the best maximum-capacity solution for large homes or extended outage protection. This powerhouse includes one inverter and two batteries for immediate 12kWh capacity.
The 7200W continuous output powers virtually any household appliance, including 3-ton central air conditioners. By adding inverters, the system scales to an incredible 21.6kW output, allowing you to live normally even during prolonged blackouts.
The massive expandability to 90kWh provides over 30 days of essential power for a typical North American home. This eliminates range anxiety during hurricane season or multi-day winter storms.
The EcoFlow app provides intelligent power management, analyzing usage patterns and prioritizing circuits to maximize backup duration. The system maintains full 7200W output even while simultaneously charging.
For those who refuse to compromise on backup capacity and want the ultimate peace of mind, this system delivers unmatched power security.
Pros:
- Massive 12kWh base capacity
- Expandable to 90kWh total
- 21.6kW maximum output possible
- 30+ days backup at full expansion
Cons:
- Highest price point
- Overkill for smaller homes
How to Choose Best Solar Generators for Whole House
Calculate Your Power Needs
Start by identifying which appliances you need to run during an outage. Check the wattage ratings on your refrigerator, freezer, well pump, medical equipment, and heating or cooling systems.
Add up the running watts of all essential devices to determine minimum capacity. Remember that some appliances like air conditioners and refrigerators have surge watts that are 2-3 times higher than running watts.
A typical home needs 5,000-7,000 watts for essential loads and 10,000+ watts to run everything normally including central AC.
Consider Battery Capacity and Runtime
Battery capacity measured in watt-hours (Wh) determines how long your system runs before needing recharge. A 3,600Wh battery running 1,000W of devices lasts approximately 3.6 hours.
For whole-house backup, look for systems starting at 3,600Wh minimum, with expandability to 20kWh or more. LiFePO4 batteries offer the best lifespan, lasting 3,000-6,000 charge cycles compared to 500-1,000 for standard lithium-ion.
Calculate your daily essential power consumption and multiply by the number of backup days desired to determine needed capacity.
Evaluate Voltage and Output Options
Most homes use both 120V and 240V circuits. Smaller appliances run on 120V, while heavy-duty equipment like dryers, ovens, and central AC require 240V.
Single 120V units work for partial home backup but limit which appliances you can run. For true whole-house capability, choose systems supporting 120V/240V or those that pair together for split-phase 240V power.
Check that the generator has enough output ports for your needs, including AC outlets, USB ports, and specialty connections like Anderson or NEMA TT-30 for RVs.
Assess Expandability and Scalability
The best whole-house systems grow with your needs. Look for units that accept additional batteries to increase capacity or pair with other units to boost output power.
Modular systems let you start with a smaller investment and expand as budget allows. Some systems scale from 3.6kWh to 90kWh, providing flexibility for changing needs or larger homes.
Consider whether you might add solar panels later, and ensure the system supports multiple charging methods including solar, AC, and generator inputs.
Check Charging Speed and Solar Compatibility
Fast charging minimizes downtime between outages. The best systems fully recharge in 1.5-3 hours from AC outlets, crucial for quickly restoring capacity during brief power restorations.
Solar charging capability provides true energy independence. Look for systems supporting 1,600W or more solar input for reasonable recharge times, and check if panels are included or sold separately.
Multiple charging options including EV stations, car outlets, and gas generators provide flexibility when solar isn’t available during cloudy weather or winter months.
Frequently Asked Questions
Can a solar generator really power my entire house?
Yes, but you need adequate capacity and output power. Systems with 3,600W+ output and 240V capability can run most homes, while larger 7,200W systems handle everything including central AC simultaneously.
How long will a solar generator run my house during an outage?
Runtime depends on battery capacity and your power consumption. A 3,600Wh system running 1,000W of essentials lasts about 3-4 hours, while expanded 20-90kWh systems provide multiple days of backup power.
Do I need a transfer switch or can I plug directly into outlets?
You can power individual devices through outlets, but a transfer switch or smart home panel provides automatic whole-house backup. This safely disconnects from the grid and powers your home’s circuits directly during outages.
What’s the difference between 120V and 240V solar generators?
120V systems power standard outlets and small appliances, while 240V systems run heavy-duty equipment like central AC, electric dryers, and well pumps. True whole-house backup requires 240V capability or dual units configured for split-phase power.
Are solar generators eligible for federal tax credits?
Many solar generators qualify for the 30% Residential Clean Energy Credit when paired with solar panels. Check with your tax advisor and verify that your specific model and configuration meet IRS requirements for solar electric property costs.
Final Thoughts
The EcoFlow DELTA Pro 3 offers the best balance of features, quiet operation, and ease of use for most homeowners. For budget-conscious buyers, the GROWATT HELIOS 3600 delivers exceptional value with expandability to true 240V whole-house power.
Focus on matching capacity to your actual needs rather than overbuying. Calculate your essential loads, consider expandability for future growth, and prioritize fast charging for quick recovery between outages.
Whichever system you choose, investing in solar backup power provides peace of mind and energy independence that pays dividends during every power outage.