The best home battery and backup systems of 2024

In my opinion, the Tesla Powerwall+ stands out as the best option for a whole-home battery backup system. With a capacity of 13.5kWh, it offers plenty of energy storage to get you through power outages. The 10-year warranty also provides peace of mind that the product is built to last. The companion app is user-friendly and allows for easy monitoring and management of energy distribution and usage. Plus, the ability to connect up to 10 Powerwall+ units makes it a highly adaptable choice for changing energy needs.

Note: Prices are approximate and may vary depending on location, installation, and other factors.

You’ll need to determine the wattage and voltage consumption of your entire household. Thankfully, Lowe’s has a handy worksheet to help you figure out your power needs. Once you know how many watts and volts your appliances use, you’ll want to add at least 20% to the total; that way, if you add electronics or appliances, or something that starts to draw more power than usual, your system will be able to keep up.

And if retail and installation pricing seems a bit steep, many places offer some payment plan so you can break the final cost into more affordable monthly payments.

When choosing which home battery backup systems to include, we considered the following key factors: 

• Technical Specifications: We considered technical factors such as peak, start, running voltage, and amperage. These permanent installations must be capable of handling the electrical load of all the appliances in the house on a daily basis. 
• Capacity and Power: When choosing a system, it is important to consider the current capacity and power of your home in order to determine the appropriate battery backup system you will need. Choosing a system with inadequate capacity can cause electrical wiring problems. Selecting a system with excess capacity not only ensures smooth operation but also allows for future expansion as power needs change.
• Cost: Battery backup systems can be quite expensive, which is why it is important to consider pricing and installation costs. We compared different options to ensure you were getting the best value for your investment. 
• Reliability: We took into account the reputation and reliability of the brands offering home battery backup systems, by researching customer reviews, performance track records, and overall reputations of manufacturers. 

Home batteries store energy generated by your solar panels or from the grid during off-peak hours, so that you can use it later when energy prices are higher or during power outages. They typically use Lithium-ion batteries, which are more efficient and durable than other battery technologies.

While solar panels can generate energy during the day, they don’t produce electricity at night or during cloudy weather, making it necessary to use energy stored in batteries. Additionally, batteries allow you to be more independent from the grid, which can save you money and increase your home’s energy security.

Backup battery systems are generally charged by utility grid electricity or solar power. If you live in an area where you get great levels of sunshine, then consider using solar power to charge your batteries up during the day. 

Also: The 5 best solar chargers

Alternatively, if your power outages are infrequent, then consider topping up the batteries using electricity when the cost is low.

To ensure that your battery system can meet your power needs, you should first check the capacity of the batteries. This capacity is typically measured in kilowatt-hours (KWh). Additionally, you should measure the surge current requirements of the devices you want to power, especially if you plan to start a motor, such as a sump pump. Keep in mind that powering high-demand devices like pool filters or air conditioning units for extended periods may not be feasible with a battery system.

Cost is also an important factor to consider when designing a battery system. If your power requirements exceed 15KWh of inverter power or 30KWh per day for your batteries, the cost of the system may become prohibitive. It’s also important to take into account potential inefficiencies, voltage drops, and other losses to ensure that your system can handle any situation that may arise. By considering all of these factors, you can design a battery system that meets your needs while staying within your budget.

You will need to carefully consider peak load in KWh per day when calculating the size of battery power you need. If your energy requirements are low — such as lighting — then most backup systems will be able to cope with this. However, if you need to run items like sump pumps, air conditioning, or heavy start load items, then you will need to consider peak loads, too.

Sometimes, you don’t need a continuous supply of backup power. That’s where smaller, more emergency-oriented units come in to provide backup power only when you need it. Here is a short list of emergency power stations I thought were great choices: