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A whole house battery backup is for when a power cut means more than a few lamps and a fridge. If you need central air, an electric dryer or a well pump to keep running, you need a 240V split-phase system with enough continuous output for those loads. Here is what's available right now, compared on rated output, capacity, expandability and installation fit.
The top pick is the EcoFlow DELTA Pro Ultra 6,144Wh unit. Its 7,200W 120V/240V output and path to 90kWh make it the strongest whole-home fit here. The 12kWh bundle suits longer outages, the Anker SOLIX E10 suits outdoor or wall installs, and the Jackery is a backup option.
1 EcoFlow DELTA Pro Ultra 6,144Wh Whole-Home Battery | 2 EcoFlow DELTA Pro Ultra 12kWh with Extra Battery | 3 Anker SOLIX E10 Whole-Home Battery | |
|---|---|---|---|
| Best for | Best overall | Longer outages | Outdoor install |
| Battery | 6,144Wh LiFePO4, expandable to 90kWh | 12kWh with an extra battery included | Not listed |
| Continuous output | 7,200W on 120V and 240V | 7,200W on 120V and 240V | 7.6kW per unit, 22.8kW with three units |
| Transfer time | 20 ms auto-switchover (online UPS per listing) | 20 ms auto-switchover (online UPS per listing) | Not listed |
| Expansion | Up to 15 batteries | Up to 90kWh | Not listed |
| Check price at Amazon | Check price at Amazon | Check price at Amazon |
EcoFlow DELTA Pro Ultra 6,144Wh Whole-Home BatteryBest overallMost recommended by reviewers
Check price at Amazon
EcoFlow DELTA Pro Ultra 12kWh with Extra BatteryLonger outages
Anker SOLIX E10 Whole-Home BatteryOutdoor install
A 6kWh home battery with 240V output, built to grow into a whole-home system.
Most recommended by reviewers
Check price at AmazonPrices and availability on Amazon change often.
One catchOne battery covers roughly two days of essentials, so multi-day outages need added batteries.
The EcoFlow DELTA Pro Ultra 6,144Wh unit has a single inverter rated at 7,200W continuous on 120V and 240V. That split-phase output is what central AC, electric dryers and well pumps need, and the maker says it can run a 3-ton central air conditioner. One of the two expert reviews we read named it top pick for 2026.
It also grows with your needs. The listing describes stacking up to 15 batteries for up to 90kWh, and the battery recharges to full in about two hours from solar, wall outlets or a generator. The review notes that the brand's smart home panel connects the system to your breaker box and switches to battery when the grid fails.
The same inverter with a second battery included, for more backup time from day one.
Prices and availability on Amazon change often.
If your outages run long, this is the same DELTA Pro Ultra inverter with a second battery included, so you start at 12kWh instead of 6kWh. The listing describes the same 7,200W 120V and 240V output and the same expansion path to 90kWh. The step up is capacity, not a different system.
It fits homes that run central AC or a well pump through a long outage. Because the inverter and battery arrive in separate boxes, plan for two deliveries and confirm your installer is ready before they arrive.
A weather-rated wall or floor unit that connects to an existing transfer switch.
Prices and availability on Amazon change often.
The Anker SOLIX E10 is the pick for an outdoor or wall-mounted install. The listing gives a NEMA 4 weather rating and an operating range down to -4°F, so it can sit outside without a shelter. It also connects to an existing transfer switch or inlet box, which can save on re-wiring.
Output is 7.6kW continuous, and the maker says three units scale to 22.8kW for several heavy appliances. We found no expert review of this model, so have an electrician confirm the panel fit before you buy.
Choose a whole-house system if you need central AC, an electric dryer or a well pump to run through an outage. A 120V station can't run those loads, so look for 240V split-phase output and at least 5,000W to 6,000W continuous, which lets several heavy appliances start at once.
Start with your daily use. A reader on a community forum estimated 15 to 25 kWh a day for an average three-bedroom home, and a battery sized for five days of backup gets large and expensive fast. Many buyers back up only essentials, which an expert review also recommends.
An electrician should install a transfer switch or a brand-specific smart panel to connect the battery to house circuits. That is the safest and most legal route.
The EcoFlow DELTA Pro Ultra 6,144Wh unit is our top pick. Its 7,200W 120V and 240V output covers central AC and other heavy loads, and it expands to 90kWh. One of the two expert reviews we read named it top pick.
The Anker SOLIX E10 lists 9kW of solar input per unit and scales up with more units, which suits a solar-led setup. The EcoFlow units also list solar among their charging options. Choose based on how much of your load you want covered and whether an outdoor rating matters.
Charge the EcoFlow units from wall outlets, an outdoor generator or an EV charger, all of which the listing names. The 6,144Wh unit recharges to full in about two hours, so topping up from the grid is practical. Solar is only needed if you want to recharge from panels.
Not on its own. A battery switches on quickly and runs quietly, but manufacturer materials say solar plus battery alone gives limited whole-home backup in extended outages. A generator supplies energy for long outages, while the battery covers the first moments and quiet running.
None of the four systems here is a portable unit for whole-home use. The Jackery listing describes permanent home installation, and the Anker unit is wall or floor mounted. A portable option would need its own shortlist, and the 240V requirement still applies.
It depends on daily kWh and how long you want to stay on battery. A reader's estimate of 15 to 25 kWh a day for an average three-bedroom home means a single 6kWh battery covers only part of a day of full use. The EcoFlow listing claims one 6,144Wh battery covers two days of essential power, so plan for essentials first.
Why trust BullseyeBuy
Every pick is an Amazon listing checked for stock, and the shortlist was weighed on rated output, battery capacity, expandability and installation fit. Expert, manufacturer and reader sources were used for sizing and setup advice, and only editorial reviews count toward the consensus notes.
Our expert team tests products when it is needed and researches online and in interviews. Every guide is fact-checked and edited by a real person.
The BullseyeBuy editorial team · Updated Oct 17, 2026
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