View now at Tesla Why we like it: 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 10-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. Best backup system for smaller homes Why we like it: The Enphase IQ Battery 10T offers a high-energy capacity of 10.5 kWh and delivers 5.76 kVA at peak output. It consists of three base Encharge 3T storage units, which use Lithium Ferrous Phosphate (LFP) batteries with a power rating of 3.84KW. This battery storage system cools passively, with no moving parts or fans, ensuring silent operation. Additionally, it comes with a 15-year limited warranty and a mobile app that allows for easy monitoring and control. Professional installation is necessary for this battery storage system. Who it's for: Customers who have purchased and installed the Enphase IQ Battery 10T caution other buyers to check the exact dimensions of the units they're considering to see if they'll fit in their homes. Enphase partnered with several battery cell suppliers to help prevent supply chain disruptions, so the 10T may be available in different sizes. Who should look elsewhere: The Enphase IQ is by far the trickiest model to source on this list, with customers sometimes being unable to find a unit that will fit in their homes. Brands like Tesla offer standardized unit sizes for more peace of mind when installing while Anker and EcoFlow provide modular systems for energy setups tailor-made for your home. Enphase IQ Battery 10T features: Estimated cost per kWh: About $800 | Capacity: 10 kWh | Battery type: Lithium-iron phosphate (LFP) | Scalability: Modular through installers | IP Rating: IP67