Exploring
The EcoFlow DELTA Pro Ultra is the best whole home battery backup for most houses — 7,200W of 120/240V split-phase output that expands to 90kWh. The Jackery HomePower 3600 Plus is the value pick for essential circuits, and the ECO-WORTHY 10.2kWh Home Power Station gives you the most stored kilowatt-hours per dollar.
How We Picked
We compared usable capacity in kWh, continuous and surge output, whether the unit delivers true 120/240V split phase (needed for a well pump, dryer, or central AC), transfer speed, expandability, and safety listings such as UL9540 and UL1973. We also weighted whether a system works as whole house battery backup without solar, since most buyers start there and add panels later. If you want the solar-charged all-in-one angle instead, see our solar generators for home backup guide; for rack-mount storage you wire yourself, see our solar battery bank picks.
1. Best Overall: EF ECOFLOW DELTA Pro Ultra Home Battery Backup
EF ECOFLOW DELTA Pro Ultra Home Battery Backup
EcoFlow
- 6,144Wh LiFePO4 base, expandable to 90kWh
- 120/240V split phase with 7,200W AC output
- Charges to full in about 2 hours
- Pairs with a Smart Home Panel for true whole-home switchover
- Amazon "Overall Pick" in whole home battery backup
- 4.3★ from 140+ owners
Why we picked it: This is the unit that actually earns the phrase whole home. Most battery backups give you 120V only, which quietly rules out the well pump, the dryer, and the central air — the loads that make an outage miserable. The DELTA Pro Ultra puts out true 120/240V split phase at 7,200W, stacks to 90kWh if you keep adding batteries, and refills in roughly two hours. It's Amazon's Overall Pick in the category, and for a house rather than a room, it's the one to beat.
2. Best Value: Jackery HomePower 3600 Plus Home Backup Power Station
Jackery HomePower 3600 Plus Home Backup Power Station
Jackery
- 3,584Wh LFP battery, expandable to 21kWh
- 3,600W AC output covers essential circuits
- LiFePO4 chemistry rated for thousands of cycles
- Solar-ready when you're ready — works without panels first
- One of the category's best-selling home backup units
- 4.6★ from 160+ owners, 500+ bought in the past month
Why we picked it: Most people don't need to run the whole panel — they need the fridge, the freezer, the furnace fan, the well pump, the internet, and the lights, for two or three days. The HomePower 3600 Plus does exactly that at a fraction of a full split-phase build, and it expands to 21kWh if your definition of "essential" grows. It's also the most-purchased unit of the three, which tells you the price-to-capacity math lands for a lot of households.
3. Best Capacity per Dollar: ECO-WORTHY 10,240Wh Home Power Station Backup Power
ECO-WORTHY 10,240Wh Home Power Station Backup Power
ECO-WORTHY
- 10,240Wh (10.2kWh) of LiFePO4 storage
- Built-in inverter — no separate box to buy or wire
- Bluetooth and WiFi monitoring with communication support
- 120V/240V output for well pumps and larger loads
- Designed as a fixed home installation, not a portable
- 4.4★ from verified owners
Why we picked it: If your outages are measured in days rather than hours, stored kilowatt-hours matter more than headline wattage — and this is where ECO-WORTHY consistently undercuts the name brands. You get 10.2kWh with the inverter already built in, plus Bluetooth and WiFi monitoring so you can watch state of charge without opening a closet. It's less polished than the EcoFlow, and it's meant to be installed rather than carried, but on stored energy per dollar it's the strongest of the three.
Comparison Table
| Pick | System | Capacity | Output | Best for |
|---|---|---|---|---|
| Best Overall | EcoFlow DELTA Pro Ultra | 6,144Wh (to 90kWh) | 7,200W / 120-240V | Whole-home switchover |
| Best Value | Jackery HomePower 3600 Plus | 3,584Wh (to 21kWh) | 3,600W / 120V | Essential circuits |
| Best Capacity per Dollar | ECO-WORTHY 10.2kWh Home Power Station | 10,240Wh | 120V/240V | Long-duration outages |
What to Look For in a Whole Home Battery Backup System
120V only vs. 120/240V split phase. This is the single decision that separates a real whole house battery backup from a big power station. Well pumps, electric dryers, water heaters, and central air are 240V loads. If a system only outputs 120V, those circuits stay dark no matter how many kilowatt-hours you bolt on.
Capacity (kWh) vs. output (kW). Output is how much you can run at once; capacity is how long you can run it. A 3,600W unit with 3.6kWh runs a lot for a short time. Size output to your biggest simultaneous load, then size capacity to how long your utility typically takes to restore power — and then add a margin, because the storm that takes the grid down rarely reads the average.
Whole home battery backup without solar. Every system here charges from the grid, so you can install battery backup now and add panels later. Grid-charging during off-peak hours is also how these systems pay for themselves in time-of-use utility territories. If you do plan to add solar, check our solar panel kit guide and confirm the unit's maximum solar input first.
How it connects to the house. A backup system is only automatic if something switches the house over. That's either a manufacturer's smart panel, or a conventional transfer switch feeding a subpanel of critical circuits. Budget for that piece — buyers routinely forget it and end up running extension cords through a doorway.
Safety listings and chemistry. Look for LiFePO4 (not NMC) for home storage — it is far more thermally stable — and for UL1973 on the battery and UL9540 on the complete system. Some jurisdictions require those listings for a permitted install, and your insurer may ask.
Bottom Line: Which Should You Buy?
For true whole-house coverage: the EcoFlow DELTA Pro Ultra. Split-phase output and 90kWh of headroom mean nothing in the panel is off-limits.
For essential circuits on a budget: the Jackery HomePower 3600 Plus. The best home battery backup value if you can live without 240V loads.
For multi-day outages: the ECO-WORTHY 10.2kWh Home Power Station. 10.2kWh with the inverter included is a lot of runtime for the money.
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Frequently Asked Questions
What is a whole home battery backup system?
It's a large rechargeable battery — usually LiFePO4 — paired with an inverter that powers your house when the grid goes down. Unlike a generator, it's silent, needs no fuel, produces no exhaust, and can switch over fast enough that you barely notice the outage. Systems range from a few kWh covering essential circuits to 30kWh+ running an entire home.
Can I get whole home battery backup without solar?
Yes, and it's how most people start. Every system in this guide charges from a standard wall outlet or hardwired grid connection, so you can install battery backup first and add solar panels months or years later. Grid-charging overnight on cheap rates and discharging during peak hours is a common use even in homes that never add panels.
How many kWh do I need for whole house battery backup?
A rough guide: 5kWh covers a fridge, freezer, internet, and lights overnight. 10kWh gets a typical household through a full day of essential circuits. 20-30kWh starts to cover a whole home including 240V loads like a well pump or central air. Check your utility bill for daily kWh usage, then decide how many days you want to cover.
Is a home battery backup better than a generator?
They solve the problem differently. A battery is silent, automatic, maintenance-free, and safe indoors, but it holds a fixed amount of energy. A generator runs as long as you feed it fuel but is loud, needs servicing, and must sit outside. Many off-grid and rural homes run both — battery for the first day and for silent overnight coverage, generator for the long tail. See our portable generator guide for that side.
Do I need an electrician to install a home battery backup?
For anything that ties into your panel, yes — and in most jurisdictions a permit as well. Plug-in units that power a few devices by extension cord don't require one, but the moment a system feeds household circuits it needs a licensed electrician and a proper transfer device. This is not a corner worth cutting; backfeeding a grid line can kill a utility worker.
Related Guides
How We Research
Picks are based on manufacturer specifications, current Amazon availability, and patterns across verified owner reviews. Capacity and output figures are manufacturer ratings — confirm current specifications and safety listings at the retailer before buying.
Safety note: Any battery system that feeds household circuits must be installed by a licensed electrician with a proper transfer device. Never connect a power source to your home wiring without one — backfeeding the utility line can electrocute line workers restoring your power.