The Enphase Encharge: the complete review

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Enphase is one of the biggest names in solar inverter technology, and in 2019 the company announced its foray into energy storage with the Enphase Encharge

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How does the Enphase Encharge work?

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

As with other battery products, the Enphase Encharge is sized for day-to-day use at your home and is often paired with a home 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 electricity stored in your battery instead of having to buy it from your utility company.

Key things to know about the Enphase Encharge

Enphase describes the Encharge battery as an “all-in-one AC-coupled storage system.” It offers various grid-tied functions, including increasing household solar self-consumption and managing time-of-use (TOU) electricity rates for maximum savings on your electricity bill.

When evaluating solar batteries like the Encharge, 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 chemistry, depth of discharge, and roundtrip efficiency

Size

The Enphase Encharge comes in two different sizes with different power and usable capacities. 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 from your battery on a full charge. The Encharge system is also, to an extent, modular, meaning you can add multiple battery products to your storage setup. For example, you might want to install one Encharge 10 and an extra Encharge 3 to boost your total storage capacity for larger properties with higher electricity needs.

Think of your battery like water running through a pipe. 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 available energy capacity faster too.

Enphase Encharge power and usable capacity by model

ModelPowerUsable capacity
Encharge 31.28 kW3.36 kWh
Encharge 103.84 kW10.08 kWh

A battery’s power determines what appliances you can run with it at once, while usable capacity determines how long those appliances can be run. Batteries with a higher power rating are capable of powering more robust appliances 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 boast of superior off-grid capabilities, while others offer software solutions for rate arbitrage. Here are some of the most important qualities of the Enphase Encharge:

Coupling

The Enphase Encharge is an AC-coupled battery; this means that in a solar-plus-storage system, direct current (DC) electricity flows from solar panels to a solar inverter that transforms the electricity into alternating current (AC) electricity. That AC electricity can then flow to your home appliances, or go to another inverter that transforms the electricity back to DC for storing in a battery system.

ac coupled battery system diagram

Backup power

The Enphase Encharge comes with backup power capabilities. Most solar batteries require an external transfer switch to allow for off-grid operation; however, Enphase offers a product called the Enpower smart switch, which is designed for installation with your Enphase battery system. This component connects your home, the grid, your storage, and your solar energy system all together so that the Enphase Encharge system can automatically power your home appliances when the grid goes down.

Chemistry

The Enphase Encharge is a lithium-ion storage product; specifically, it is a lithium iron phosphate (LFP) battery. Relative to other types of batteries, LFP batteries are known for their high power rating and safety – to learn more about how different lithium-ion battery chemistries stack up against one another, check out our overview of battery chemistry differences.

Performance metrics

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

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 it, many battery manufacturers specify a maximum DoD level for optimal battery performance. In general, batteries with a higher depth of discharge are considered higher quality products. The Enphase Encharge line of storage products boasts a depth of discharge of 100 percent across all battery sizes, reflective of its safe and advanced LFP battery chemistry.

Roundtrip efficiency is a measure of the electrical losses involved with charging and discharging a particular battery. The higher the percentage, the more efficiently the battery is able to convert incoming electricity into stored electricity and then back into usable electricity. Both batteries in the Enphase Encharge line have a roundtrip efficiency of 89 percent; this means that for every 10 kilowatt-hours (kWh) of electricity you put into the battery, you’ll receive 8.9 kWh of output.

Enphase Encharge warranty coverage

Enphase Encharge warranties

  • Warranty period: 10 years
  • Warrantied cycles: 4,000
  • Guaranteed end of warranty capacity: 70%

In most cases, homes with an Encharge battery will charge and drain the battery every day. The Encharge comes with a 10-year, or 4,000 cycle, warranty. Enphase guarantees that the battery will maintain at least 70 percent of its capacity to hold a charge during that time period.

Enphase’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.

The battery life of your Encharge battery will deteriorate in the same way. That isn’t an indicator of a product flaw – all batteries lose some of their ability to hold a charge over time, whether it’s an electric vehicle battery, a home energy battery, or a rechargeable AA battery. This is why Enphase offers a warranty that guarantees a certain amount of storage capacity.

Warranty, capacity, and power are three of the most important metrics you should consider when comparing home battery options. If you’re curious to learn more about the best way to perform your own battery comparisons, check out our video explaining how to evaluate your home energy storage options:

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 Enphase Encharge cost?

The Enphase Encharge is still listed for pre-order only, so exact pricing isn’t available yet. Additionally, a solar battery installation isn’t as simple as a list price for a component – depending on your electrical setup, among other factors, installation costs can vary widely. As a rough estimate, you can expect the Enphase Encharge 3 to cost between $6,000 and $8,000, and the Encharge 10 to cost between $18,000 and $20,000 with a full system installation.

If you want to install the Encharge as part of a solar-plus-storage system, battery costs are just one part 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 Enphase Encharge 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 Enphase Encharge?

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 Encharge, only have enough capacity to store a few hours of electricity. That being said, the larger Encharge 10 battery could serve as temporary backup when the grid goes down if you have a solar panel system to provide power.

Where to buy the Enphase Encharge

The Enphase Encharge battery is currently available through pre-order only. Whether you want to install a Enphase Encharge or another home battery pack, you will most likely need to work through a certified 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 Enphase 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 focuses primarily 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 being ultra-competitive at a new, obscure board game.

14 thoughts on “The Enphase Encharge: the complete review

  1. Phil

    Are these released yet? I have a company quoting me an enphase system including this battery backup solution and would hate to have to wait forever to schedule install if they’re not available yet.

    Also, can someone give me an idea of maximum critical loads that I can have put on this with the 20 amp limitation? Don’t outlets usually run on a single 20 amp breaker? I’m not smart on electrical stuff but need to know if this would be appropriate for a full sized fridge, a few outlets, and some LED lights to run during power outage and for approximately how long?

    Reply
  2. Ed

    Enphase says the Enpower smart switch will receive a software update in the future that will allow it to connect with a generator. If this will allow the generator to charge the Encharge battery, then this is VERY tempting since there do not appear to be any plans to give the Powerwall this capability. BUT if it just uses the generator power directly sustain the micro-grid, with no battery interaction, there isn’t much added value since this is currently available. I’ll be waiting for clarification before considering a purchase.

    Reply
  3. Don

    Regarding the question about charging an electric car, a 50 kilo-Watt-Hour (kWh) battery, depending on the car type, could give you a couple hundred miles of range. So, very roughly, let say you drive 100 miles, you’d need to charge about 25 kWh. If a 10kWh battery system costs about $20K, You’d need 2 – 3 of those, so $50K – $60K for a battery system capable of charging a typical(ish) car for 100 miles.

    I’m not familiar with the Enphase battery system, but you’d also need to consider how many amps it could supply. A Tesla model S could charge at up to 80 amps, while a Nissan Leaf might be 30 amps. That’s a good question for Enphase, “how many amps can the battery supply?”

    Reply
  4. Matt

    Not a good deal at all. A website has the Encharge 10 listed for preorder for $14k and you get 10kwh capacity with 3.84kw output power (doesn’t specify continuous or peak). Compare that to a Tesla powerwall 2 which has a 13.5kwh capacity with a 5kw continuous (7kw peak) power output and cost only $6.5k.

    So in other words, with the Tesla powerwall 2 you get 35% more capacity, 30% more power output, and you pay 53% less money. Or… you could get 2 Tesla powerwall 2’s for a combined capacity of 27kwh for the same price as one Encharge 10 with 10kwh capacity.

    I don’t see how Enphase thinks they have a chance to compete with tesla with that pricing. I’d like to find out how much the Sunpower equinox systems cost, there batteries at 13 kwh are very close to Tesla. It’ll be interesting to see if a Sunpower equinox system (must be bought as whole system with solar array) is priced competitively with the cost of a tesla system or tesla powerwall 2 + existing array.

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  5. jim asbel

    I am wanting backup power for when the grid goes down. I have a 24 kw solar system now. I am interested in a residential system. The solar install was done by SunWorks.

    Reply

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