The Bluetti EP900 and the Panasonic Evervolt are modular home batteries, offering the same amount of energy storage capacity per system and a similar design. I've spent hundreds of hours scouring through tech specs, talking to industry experts and creating scoring methodologies for home batteries. And while Panasonic's Evervolt is still a solid option, the Bluetti EP900 is the clear winner in comparison. It was also named CNET's Best Solar Battery of 2024.
Modular batteries allow you to start small and upgrade your system’s capacity as your energy needs change. If you decide you need a capacity upgrade, you can add another battery module to your existing system. This way you won’t need to buy another giant battery.
The smallest system size for both the EP900 and the Evervolt is 9 kWh, which is two battery modules. You can install up to four modules per system. If you hit maximum capacity on your system (18 kWh), you’ll have to install an additional system to upgrade your capacity. Panasonic allows you to install up to four Evervolt systems for a total capacity of 72 kWh. Bluetti allows up to two EP900 systems for a total capacity of 36 kWh.
Both batteries do just fine in the performance department. But the EP900’s continuous 9 kW output gives it a big advantage over the Evervolt. Your battery’s continuous power output is the amount of power your battery can supply to your home at any given moment. The higher the output, the more parts of your home the battery can supply power to.
The Evervolt, however, offers a continuous output of 7.6 kW at any capacity size -- but only if installed with solar panels. Without solar panels, you’ll only get 5.5 kW of continuous power if you choose the 9 kWh Evervolt model. The Bluetti EP900 gives you 9 kW of continuous power, regardless of the energy storage capacity option you choose.
The depth of discharge for each battery is the same (90%). A battery’s depth of discharge is the amount of energy you can drain (discharge) from the battery relative to its maximum capacity. Draining your battery completely can actually shorten its lifespan. To avoid this, some manufacturers will block off a certain amount of your battery’s capacity to ensure it never truly reaches zero. With both the EP900 and the Evervolt, you have access to about 90% of your battery’s actual maximum capacity.
And lastly, there’s round-trip efficiency. This is essentially the amount of energy that makes its way into the battery for energy storage without getting “lost” during the process, usually to heat. Think of it as a measure of how efficient your battery system is at storing energy.
Panasonic’s Evervolt has better efficiency specs, no matter how you choose to wire it up. It has a round-trip efficiency rating of 89% when AC-coupled and 94% when DC-coupled. The EP900 has one of the lower round-trip efficiency ratings we’ve seen for home batteries (85%). The average round-trip efficiency rating for home batteries is around 90%.
Based on each battery’s expected energy throughput, Bluetti’s warranty promises a longer lifespan for its battery than Panasonic. The expected energy throughput is the total amount of energy the manufacturer estimates your battery will be able to deliver during its lifetime. In most cases, once your battery hits its throughput, your warranty expires, even if you still have years worth of coverage left.
And while Panasonic does offer a 12-year warranty, the actual expected lifespan of the Evervolt is about industry standard (6,000 cycles). That doesn’t necessarily mean it’s bad -- it’s just average. Bluetti expects each battery module for the EP900 system to deliver 15.48 MWh worth of energy during its lifetime, which is pretty great for a small 5 kWh module. Bluetii also promises a higher end-of-warranty capacity guarantee.
However, Panasonic offers a more robust warranty for its system. The 12-year warranty applies to the entire system (battery, inverter, SmartBox) -- not just the battery modules themselves. Labor costs are also included.
Because of the site-specific nature of a home battery purchase, it can be tricky to find accurate pricing for home battery systems. Every home is different, and your battery system needs to be tailored to your home’s specific energy needs. In most cases, you’ll need to get a quote from an installer in your area to get the most accurate estimate of how much this is going to cost you.
We weren’t able to get an accurate estimate for how much the Panasonic Evervolt costs. However, we can provide a ballpark estimate based on home battery pricing trends. Most home batteries typically tend to cost around the $10,000 to $15,000 range. But it’s definitely possible to find smaller batteries cheaper than $10,000. As a general rule of thumb, expect to pay about $1,000 to $2,000 per kilowatt hour of energy storage capacity. Installation fees vary, but generally expect to pay somewhere between $2,000 to $3,000.
Bluetti does things a bit differently. Because the Bluetti EP900 ships direct-to-consumer, the price for the system is listed on Bluetti’s website. The price tag depends on the amount of energy storage capacity you want. A 9 kWh system is about $10,300, a 13.5 kWh system is about $13,800 and the 18 kWh option is about $17,300.
First off, it’s important to note that there’s no such thing as “the best home battery.” The best home battery for you is the one that meets your household’s energy needs, goals and budget. But with that being said, some batteries do offer better specs than others.
The Bluetti EP900 is more powerful than the Panasonic Evervolt, and Bluetti offers better price transparency, higher energy throughput per module (battery lifespan) and more options for customer support. It’s also possible to install most of the EP900 system on your own, which could save you a bit of money on installation costs. You’d just need to hire an electrician to help you install the sub-panel.
However, Panasonic offers a more robust warranty for the Evervolt, covering the entire system and any labor costs incurred. Panasonic also makes its own solar panels, so if you’re considering installing rooftop solar and adding a battery, Panasonic offers a one-stop shop. Not only is this just more convenient, but it's also less of a headache for your installer. You also won’t have to worry about installing anything on your own -- it’ll be left to the professionals.
Both the Bluetti EP900 and the Panasonic Evervolt have their pros and cons, but we found the EP900 to be the winner (based on the scoring criteria below). At the end of the day though, the right battery for you comes down to your personal preference, budget and what’s available in your area.
First and foremost, it's important to point out that not every solar battery is right for every home. Solar is a very site-specific and personalized decision process, so it's a little tricky to pinpoint exactly which solar battery is the "best" battery for your home's energy needs without doing an on-site consultation.
First, we determined which categories would be used to evaluate each battery's performance, capacity and value. We also weighted each category. The weight of each category reflects the importance we felt was relevant to the average consumer.
We looked at more than 15 of the most widely available batteries on the market and collected the data for each category to compare the numbers. Each category (for every battery) was given a tier-style rating (from 1 to 5) to evaluate which aspects of each battery were above average (among our list), just average or below average.
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