panasonic evervolt review

The Panasonic EverVolt home battery complete review

In 2019, Panasonic, one of the world’s largest battery cell manufacturers, officially launched their own residential battery storage product: the EverVolt. A scalable storage system with both AC and DC-coupled configurations, the EverVolt can provide plenty of back-up energy for your home in the event of a grid outage, especially when paired with a solar panel system.

This is an unbiased review: EnergySage is not paid to review brands or products, nor do we earn money from affiliate advertising in this article. The content of this blog is based on research and information available at the time of writing. Learn more about our mission and how we make money as a company.

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NOTE: Panasonic has an updated version of the EverVolt: the EverVolt 2.0. Learn about their new EverVolt 2.0 offering here.

How does the Panasonic EverVolt work?

The Panasonic EverVolt pairs well with solar panel systems, especially if your utility has reduced or removed net metering, introduced time-of-use rates, or instituted demand charges for residential electricity consumers. Installing a storage solution like the Panasonic EverVolt with a solar energy system allows you to maintain a sustained power supply during both day and night, as long as you store enough power from your solar panels when the sun is shining.

As with many other home battery products, the Panasonic EverVolt is sized for day-to-day use at your home and is primarily designed to be paired with a solar panel system. When your solar panels produce more electricity than you can use in your home, you can store the excess electricity in the battery system instead of sending it back into the grid. Later, when your panels aren’t producing enough electricity to meet your home’s needs, you can use the stored energy in your battery instead of having to buy it from your utility company.

The EverVolt is specifically designed to pair with Panasonic’s premium HIT panels. With the HIT modules’ built-in Enphase microinverters, you can create a complete solar plus storage home setup all under warranty by the same company.  

Key things to know about the Panasonic EverVolt

In Panasonic’s own words: “With EverVolt, homeowners will be one step closer to grid independence and see a quicker return on their solar investment. EverVolt users will have the ability to store unused power to use when they need it most or sell surplus energy back to their local utility and generate income.” Uniquely, the EverVolt is available in almost identical AC and DC versions, meaning it can be just as easily installed alongside a new solar panel system as it can be added as a retrofit to an existing system.

Like many other battery companies, Panasonic provides a companion app for their energy products. With their EverVolt software and a solar plus storage system, you can view real-time energy usage and solar electricity generation.

When evaluating the EverVolt, there are various important metrics and technical specifications to keep in mind. Among the most important are the size of the battery (power and capacity), its depth of discharge, and roundtrip efficiency


The Panasonic EverVolt comes in four different models: two AC coupled (model numbers: EVAC-105-4 and EVAC-105-6) and two DC coupled (EVDC-105-4 and EVDC-105-6). Both types of EverVolts are modular, meaning they can be stacked together to create even larger, more powerful battery systems. The AC and DC coupled models are essentially the same as far as performance metrics, with the exception of roundtrip efficiency – so we’ll refer to them both by their designations as “Standard” and “Plus” to include both the AC and DC-coupled versions of the same batteries.

Two important metrics to keep in mind when comparing the EverVolt to other home storage options are power and usable capacity. Power (measured in kilowatts, or kW) determines the maximum amount of electricity that can be output at a single time, while usable capacity (measured in kilowatt-hours, or kWh) is a measure of the maximum amount of electricity stored in your battery on a full charge. The larger Plus model boasts a power rating of 5.5 kW to go along with 17.1 kWh of usable capacity. The Standard model offers 4.6 kW of power and 11.4 kWh of usable capacity.

Importantly, the EverVolt system is modular, meaning that you can add multiple battery products to your storage setup if you want even more backup power. Panasonic’s EverVolt spec sheet indicates that you can connect up to two of their Plus model batteries to a single EverVolt inverter, so you’ll need to upgrade your supporting hardware to add additional storage capacity beyond the stored energy of two batteries.

Think of your battery like water running through a pipe. The usable energy capacity is the amount of water available to push through the pipe, while power is the size of the pipe itself. Larger pipes allow more water to flow through at once, which depletes the water faster. Similarly, a battery with a high power rating can deliver more electricity at one time, but will burn through its stored energy faster too.

A battery’s power determines the number of appliances you can run from the battery concurrently, while usable capacity determines how long those appliances can be run. Batteries with a higher power rating are capable of powering more, bigger appliances (i.e., your HVAC system) or many appliances at once, while batteries with a higher usable capacity can store more total energy and thus can run your appliances for longer periods of time without needing to recharge.

Basic functionality

The functionality of one solar battery next to another can vary; some batteries have excellent off-grid capabilities, while others offer software solutions specific to rate arbitrage. The suite of EverVolt products are designed to provide both of these services.

Performance metrics

Two key ways to evaluate the performance of a solar battery are its roundtrip efficiency and depth of discharge.

Roundtrip efficiency is a measure of electrical losses involved with charging and discharging a battery. The higher the efficiency percentage, the more efficiently the battery is able to convert incoming electricity into stored electricity and then back into usable electricity. The Panasonic EverVolt has a roundtrip efficiency of 90% for both AC-coupled batteries DC-coupled batteries; this means that for every 10 kilowatt-hours (kWh) of electricity you put into the battery, you’ll receive 9 kWh of output. You can read more about the difference between AC and DC batteries in our article specific to different battery technologies.

Depth of discharge (DoD) indicates the percentage of a battery’s energy that has been discharged relative to the overall capacity of the battery. Because the useful life of a battery decreases each time you charge, discharge, and re-charge–or cycle–your battery, many battery manufacturers specify a maximum DoD level for optimal battery performance. In general, batteries with a higher depth of discharge are considered better quality products. Unfortunately, the Panasonic EverVolt doesn’t list a depth of discharge on its spec sheet.

Panasonic EverVolt warranty coverage

Panasonic EverVolt warranties

  • Warranty period: 10 years 
  • Guaranteed end-of-warranty capacity: 60%
  • Throughput warranty: 30.2 MWh for the Standard, 45.3 MWh for the Plus (7.56 MWh per battery module)

The EverVolt battery line is backed by 10-year product and performance warranties that cover the product in the case of faulty parts or defects, as well as the actual performance of the battery. Panasonic’s warranty coverage says that by the end of 10 years, your EverVolt will still be able to store at least 60 percent of its initial out-of-box capacity.

Panasonic also offers an energy throughput warranty – the 60 percent retained capacity after 10 years is only valid if the total energy throughput over the 10 year period is less than 7.56 megawatt-hours (MWh) per battery module. Summed up, your EverVolt Standard model battery is warrantied to retain at least 60 percent of its capacity by the time you hit a lifetime of 10 years or an energy throughput of 30.2 MWh, and your EverVolt Plus model battery is warrantied to retain at least 60 percent of its capacity by the time you hit a lifetime of 10 years or an energy throughput of 45.3 MWh, whichever happens first.

Importantly, Panasonic’s battery technology is similar to other rechargeable batteries both large and small: as time goes on, the battery loses some of its ability to hold a charge. Think of how the battery life of a brand-new smartphone compares to one that is a few years old. As you continually charge and drain your phone’s battery, it starts to lose some of its ability to hold a charge.

If you want to compare individual battery models side-by-side, our battery Buyer’s Guide lets you select products and compare them based on efficiency, capacity, power, and more.

How much does the Panasonic EverVolt cost?

The cost of installing a battery isn’t as straightforward as looking up the list price for an individual component–i.e., your battery. In fact, depending on your electrical setup, installation costs can vary widely. Panasonic has said to expect EverVolt prices between $15,000 and $20,000 (including installation), with the low end of the scale being for Standard batteries, and the high end for the Plus model.

If you want to install the EverVolt as part of a solar-plus-storage system, battery costs are just one piece of the equation. A 5 kilowatt (kW) solar energy system costs anywhere from $9,000 to $15,000 depending on where you live and the type of equipment you choose.

That may sound like a lot of money, but installing a solar-plus-storage system can be a worthwhile investment. Whether or not the Panasonic EverVolt makes sense for you is determined by the way that your electric utility structures its rates, as well as your reasons for installing a solar battery.

In some cases, depending on where you live, you may have access to financial incentives that can reduce your home energy storage installation costs. For instance, if you live in California, you could get a cash rebate that covers most of your home battery costs through the Self-Generation Incentive Program (SGIP). Other states (such as Massachusetts) are in the early stages of evaluating battery storage performance incentives as well, and several states already provide cash rebates.

Can you go off-grid with the Panasonic EverVolt?

Installing a solar-plus-storage system at your home is a great way to take control of your electricity bill, but it doesn’t mean that you’re completely disconnected from your utility. Going “off the grid” with solar batteries is actually a more expensive and complicated proposition than you might think. Most home batteries, including the EverVolt, only have enough capacity to store a few hours of electricity. If you want to make sure you can maintain power to your property for days at a time, you’ll need to install several EverVolt batteries together to increase your storage capabilities.

Where to buy the Panasonic EverVolt

The Panasonic EverVolt battery is currently available online through Panasonic’s website, where you can request a quote and through any solar and/or energy storage installation company that is a certified Panasonic installer. Adding energy storage technology to your home is a complicated process that requires electrical expertise, certifications, and knowledge of the best practices required to install a solar-plus-storage system correctly.
A qualified EnergySage-approved company can give you the best recommendation about the EverVolt home battery system and other energy storage options available to homeowners today. If you are interested in receiving competing installation quotes for solar and energy storage options from local installers near you, simply join the EnergySage Solar Marketplace today and indicate what products you’re interested in your profile’s preferences section.

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About Jacob Marsh

Jacob is a researcher and content writer at EnergySage, where he's an expert on current issues–and new technology!–in the solar industry. With a background in environmental and geological science, Jacob brings an analytical perspective and passion for conservation to help solar shoppers make the right energy choices for their wallet and the environment. Outside of EnergySage, you can find him playing Ultimate Frisbee or learning a new, obscure board game.

11 thoughts on “The Panasonic EverVolt home battery complete review

  1. Robert Bright

    We have the EverVolt system for a while and it gives us many problems. The inverters go down and have error codes. We lose power and have to power cycle the inverters to get power back to our house. It is a huge headache and Panasonic is not helping us.

    1. Richard and Robin Hulbert

      Thanks for info, looking at kilovaukt battery paired up with Sok-ark inverter but saw Panasonic at a trade show.

  2. Andrew Nguyen

    Just a heads up. This is not a whole home backup solution only partial backup. I only have 5 “essential” circuits hooked to my Evervolt system. Installers dont really mention this, including mine. I would have bought it anyways, but my expectations were too high. Still good for back up and saving some cost at night time (if paired with solar).

    I think the one cool setting the EverVolt has is the ability to “Feed-in” to the grid during TOU hours (4-9pm for PG&E). So when the sun comes down (usually between 6-7pm in California)and your panels are not importing excess energy into the grid…you can still import into the grid at night time and make the most out of your energy credits. Not sure if other batteries have this feature though.

    1. Kinte

      Andrew, you’re the only person that I’ve seen on the web that has this system. I’m supposed to be getting an EverVolt Plus installed in June. However, I can’t find any reviews. Would you happen to have any youtube videos about it or willing to go through some features? I really have no idea what the app looks like or all of the features. Thanks.

  3. Thom

    Looking to buy evervolt, have panels and wind generator ready to go….
    Need a quote for batteries, not installation, not an idiot, retired acft mechanic…

    1. Niranjan Patel

      I have Evervolt system for sale. AC or DC . 17.1 KW system for $13800 Plus any applicable taxes. Shipping Free. It is a prepay offer. I also have Panasonic Solar panels (325 watts to 340watts capacity) for sale. $0.76 per watt Plus any applicable taxes. Shipping is free. It is a prepay offer.
      Niranjan Patel

  4. Jack Holley

    I put a deposit on a Powerwall in my Tesla account while my solar was being installed in the fall of 2017. Finally, this year I got a quote for Powerwall installation by a Seattle installer for my home in western Washington. After I put down the deposit in July 2020 for the install, I was informed 2 weeks later that the Powerwall will not be available (due to shortage) for the installer until spring 2021. That’s why I am looking at the Panasonic battery system because they make the batteries for the Powerwall and I am hoping Panasonic has plenty of batteries for their own systems.

  5. Lawrence Vinsor Webster

    Since Panasonic makes the batteries for Tesla, isn’t it more feasible to opt for the Tesla Powerall?


    1. Andrew Nguyen

      Tesla customer service is really bad, based on my own and other’s experience. Ive had some issues with my EverVolt, but the service has been stellar.

      1. Lance

        Maybe you can also pay attention to the brand BSLBATT from China. Their product quality is very good, and their after-sales service attitude makes people feel very comfortable. They pay attention to every small problem of customers!


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