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Founded in 2016, Fortress Power is a Southampton-based manufacturer of lithium-ion solar batteries, offering both businesses and homeowners safe, reliable, and sustainable energy storage solutions. Their storage solutions support multiple applications, are easy to install, and are competitively priced, with customer satisfaction as the company''s core value. Fortress Power offers four home battery products: the eVault 18.5, the eVault Max 18.5, the eFlex 5.4, and the LPF-5K-48V. In this article, we''ll explain what you need to know about their various offerings.
The Fortress Power batteries pair 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 a Fortress Power battery 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, Fortress Power batteries are sized for day-to-day use at your home and are 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.
Fortress Power aims to provide affordable and user-friendly lithium-ion storage solutions based on the latest technology. Their energy storage units are compact and compatible with most solar systems, allowing homeowners and businesses to minimize grid dependency and maximize solar storage capacity. Fortress Power''s batteries come in four models: the eVault 18.5, the eVault Max 18.5, the eFlex 5.4, and the LFP-5K-48V.
When evaluating Fortress Power batteries, 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.
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 available energy capacity faster too.
A battery''s power determines what appliances you can run with it at the same time, 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.
The functionality of one solar power battery next to another can vary; some batteries have excellent off-grid capabilities, while others offer software solutions specific to rate arbitrage. Here are the important qualities of the Fortress Power:
Fortress Power batteries come with backup power capabilities. Most solar batteries require an external transfer switch to allow for off-grid operation. Fortress Power batteries are able to have a full home backup and achieve grid independence during power outages. This component connects your home, the grid, your storage system, and your solar energy system all together so that you can automatically power your home appliances if the grid goes down.
Fortress Power batteries use lithium iron phosphate (LFP) chemistry. This is one of the most common lithium-ion battery technologies, and for good reason: LFP batteries are known for their high power rating and safety. Fortress Power batteries can also operate in a wide temperature range of -4 to 140 F. To learn more about how different lithium-ion battery chemistries stack up against one another, check out our overview of battery chemistry differences.
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. Fortress Power batteries boast a depth of discharge of up to 100 percent across all battery sizes, reflective of their 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. Fortress Power batteries have a roundtrip efficiency of more than 98 percent; this means that for every 10 kilowatt-hours (kWh) of electricity, you put into the battery, you''ll receive 9.8 kWh of output at least.
In most cases, homes with Fortress Power will charge and discharge their battery every day. So, how long does the Fortress Power last? The Fortress Power comes with a 10-year, or 6,000 or 8,000 cycles (depending on the model) warranty and Fortress Power guarantees that the battery will maintain at least 70 percent of its capacity to hold a charge during that time period.
Fortress Power 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 Fortress Power 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 after extended usage, whether it''s an electric vehicle battery, a home energy battery, or a rechargeable AA battery. This is why Fortress Power offers a warranty that guarantees a certain percentage of storage capacity.
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.
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