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As someone who experiences regular power outages due to storms and random occurrences, I've learned that having a backup plan for electric outages is essential for my home. While you can always use a gasoline- or propane-powered generator, a battery system can be a renewable, zero-emissions way to provide your home with an efficient backup solution.
A set of backup batteries can offer a long-term solution to power outages, especially as you can connect your battery storage system to a solar panel system.
Our top pick for the best home battery and backup system is the Tesla Powerall 3 due to its 10-year warranty, great power distribution, and energy capacity of 13.5kWh. However, the Tesla Powerall 3 is quite expensive, and different systems may better suit your needs, so we've included a variety of picks to fit all types of needs and budgets.
The Tesla Powerwall is a leading battery backup system that simplifies your switch to backup battery power. It can be recharged using solar panels, so you can rely on stored solar energy during power outages.
The Powerwall 3 has an energy capacity of 13.5 kWh and can deliver continuous power of 11.5 kW. It has a ten-year guarantee and can be monitored and managed through its app. You can order a Tesla Powerwall directly from Tesla or through certified installers without buying Tesla solar panels.
You can connect up to 4 Powerwall 3 to ensure you have the right-sized backup batteries for your home. For optimal results, it's best to use the Tesla Powerwall with a solar panel system, especially if you'd like to go off the grid or save some money on your utility bills. Additionally, you can recoup up to 30% of the cost of installing a solar power system with a 2024 solar tax credit.
The long-running PBS home improvement show This Old House strongly encourages customers considering the Tesla Powerwall to take advantage of all local, state, and federal tax incentives to help reduce the cost of installation. One Reddit user said it's a "game-changer for continuous power," it's well worth it if you want backup during outages or to store excess solar energy.
Tesla Powerwall 3 features: Estimated cost per kWh: About $680-$700 | Capacity: 13.5kWh | Battery type: Lithium-iron phosphate (LFP) | Scalability: Up to 4 units | IP Rating: IP67
The Delta Pro Ultra is EcoFlow's latest portable battery unit. Its true beauty lies in combination with the new EcoFlow Smart Home Panel 2 to become a seamless whole-home backup solution. The DPU is a combination inverter and battery, and the system is expandable from 6kWh to 90kWh capacity. Each Smart Home Panel 2 can support up to three inverters, and each inverter can handle up to five stackable batteries.
Even without the expanded storage capacity, a single EcoFlow DPU can provide essential power for a home for up to two days. I went hands-on with the DPU and Smart Home Panel 2 and found that it provides a seamless transfer from the grid to backup power in case of a power outage.
One of the outages I experienced with the EcoFlow Delta Pro Ultra and Smart Home Panel 2 happened during this past winter's coldest weeks. This home battery backup system gave my family the power to eat warm meals and stay warm through the night. My young kids also slept with their night lights and sound machines while we charged essential devices.
The Delta Pro Ultra is also portable and can be transported to campsites, with an RV, or remote locations. Its LFP battery means you can even bring it inside to run appliances or charge devices in a pinch without worrying about emissions. However, one Reddit user who purchased the DPU said the solar aspect is good enough for top-off but not enough to be 100% off-grid reliant.
EcoFlow Delta Pro Ultra + Smart home panel 2 features: Estimated cost per kWh: About $750 | Capacity: 13.5kWh | Battery type: Lithium-iron phosphate (LFP) | Scalability: Up to 5 batteries per inverter and up to 3 inverters per panel | IP Rating: IP65
The Anker Solix X1 is a newer home backup system with a permanent solution and modular installation. Its energy capacity ranges from 5 kWh to 180 kWh, while its power output goes from 3 kW to 36 kW. The X1's modular design allows consumers to add a specific number of modules to meet their needs.
With Lithium Iron Phosphate (LFP) batteries, the Anker Solix X1 is built for a long lifespan and different weather conditions. It can operate from -4°F to 131°F and boasts an IP65 rating, making it a good candidate for outdoor installations.
The estimated cost for a 15 kWh Anker Solix X1 configuration is around $10,000. Similar to the Tesla Powerwall +, this cost can go up to tens of thousands of dollars, especially with the addition of installation fees. The Anker Solix X1 is estimated to cost about $650 per kWh before installation costs.
Anker Solix X1 features: Estimated cost per kWh: About $650 | Capacity: 5 kWh | Battery type: Lithium-iron phosphate (LFP) | Scalability: Up to 180 kWh | IP Rating: IP65
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