Best 3,000W Whole-Home Solar Emergency Backup System
Whole-home backup covering refrigerator, freezer, well pump, sump pump, CPAP, LED lights, router, laptop, TV, and coffee maker. Approximately 6,000Wh per day.
Quick Answer
At 6,000Wh/day with well pump and sump pump loads, this system requires a 4,000W inverter capable of handling 2,250W pump surge and 600W fridge surge simultaneously. The 2,000W solar array recharges the 22,500Wh battery bank in approximately 2 full sunny days — providing buffer for multi-day outages. The 48V architecture is required at this scale for manageable wire sizing. This system covers every critical load in a typical 3-bedroom home. The plug-and-play solution is the EcoFlow Delta Pro Ultra + 400W Solar Panel ($5,799), which delivers 6,144Wh of storage and 7,200W of AC output with solar recharge built in.
System Specification
Sized for 6,000Wh/day at 48V.
| Component | Specification |
|---|---|
| Daily Energy Use | 6,000 Wh/day |
| Solar Panel Array | 2,000W |
| Battery Capacity | 22,500Wh (469Ah at 48V) |
| Charge Controller | 60A MPPT |
| Inverter | 4,000W Pure Sine Wave |
| System Voltage | 48V DC |
Option 1: EcoFlow All-in-One Bundle (Easiest Setup)
EcoFlow Delta Pro Ultra + 400W Solar Panel
6,144Wh modular whole-home station with 7,200W output. The highest-capacity portable system available.
- Capacity: 6,144Wh
- AC Output: 7,200W continuous
- Price: $5,799
No wiring required. Plug the solar panel into the station and plug appliances into the AC outlets.
Option 2: DIY Mid-Range Build (Best Long-Term Value)
Higher upfront cost than a bundled station but significantly more capacity and expandability. Best for permanent installations.
renogy-200w-x10
litime-200ah-48v-x2
victron-150-60-mppt
aims-4000w-inverter
Option 3: DIY Budget Build (Lowest Upfront Cost)
The lowest-cost path to solar power. AGM batteries cost more to operate long-term due to shorter cycle life, but work well for occasional or seasonal use.
newpowa-200w-x10
weize-200ah-agm-x12
epever-60a
renogy-4000w-inverter
Why This System Works
At 6,000Wh/day with well pump and sump pump loads, this system requires a 4,000W inverter capable of handling 2,250W pump surge and 600W fridge surge simultaneously. The 2,000W solar array recharges the 22,500Wh battery bank in approximately 2 full sunny days — providing buffer for multi-day outages. The 48V architecture is required at this scale for manageable wire sizing. This system covers every critical load in a typical 3-bedroom home.
Frequently Asked Questions
Can this system run a central air conditioner?
A central 3-ton AC draws 3,500W running with 10,500W startup surge — beyond the 4,000W inverter in this system. For whole-home AC backup, upgrade to a 10,000W inverter and a 48V battery bank of 1,000Ah or more. This pushes total system cost to $15,000–20,000. Most homeowners opt to skip central AC from backup and use a single room portable AC on a separate 1,500W circuit instead. The EcoFlow Wave 2 portable AC (700W) is the practical solution for targeted cooling during outages.
How many solar panels does this system need?
Ten 200W panels (2,000W total) arranged in series-parallel strings on a 48V system. Two strings of 5 panels each, wired in series for 125V per string and then combined in parallel. Each string produces 62.5A at 48V through a 60A MPPT charge controller. The array requires about 200 square feet of mounting space — a 10x20 foot ground mount frame or equivalent roof space. In the Southwest US, this 2,000W array generates 13,000Wh on a peak summer day.
What permits do I need for this system?
A permanent battery-solar installation of this scale typically requires a building permit and electrical permit from your local jurisdiction. The permit process varies by county but generally requires a single-line electrical diagram and a site plan showing panel locations. Some jurisdictions fast-track battery backup systems post-storm events. Cost ranges from $100–500 in permit fees plus inspection time. The alternative — a portable system like EcoFlow Delta Pro Ultra — requires no permits and can be moved between locations.
Different loads? Customize for your setup.
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