FoxESS energy storage
Discover the FoxESS range of inverters!
Energy costs for industrial and commercial facilities are rising year after year, while grid instability and peak-time rates are placing an ever-greater burden on businesses. For installers and resellers, selecting the right energy storage system is critical: a poorly sized or unreliable solution not only jeopardizes the return on investment but also end-user satisfaction.
FoxESS energy storage systems provide the perfect solution to this challenge. The product range includes standardized, factory-integrated all-in-one solutions that combine an inverter and a battery in a single compact unit, as well as modular, high-performance C&I BESS systems for industrial-scale projects. The products offer scalable solutions across a wide power range—from 2.5 kW up to system capacities exceeding 125 kW—suiting everything from small office buildings to larger industrial facilities.
FoxESS systems are built using LFP (lithium iron phosphate) cell technology, which guarantees exceptional cycle life, fire safety, and thermal stability even under demanding operating conditions. Models equipped with an integrated inverter enable plug-and-play installation, reducing on-site labor time and system integration risks—a particularly valuable consideration for installation partners.
Explore the full range of FoxESS energy storage systems and choose a solution that meets the technical and business requirements of your projects in every respect!
As a reseller, installer, or wholesale partner, please register in our B2B webshop before making your first purchase! Once your registration is confirmed, you can log in to the webshop, where you’ll always find up-to-date information on prices, inventory, and current discounts. After logging in, placing an order is quick and easy.
Do you have any questions about our products?
As a B2B partner, please contact your designated sales representative—our colleagues are happy to assist you and will gladly answer any questions regarding the FoxESS energy storage system you have selected.
You can also find a lot of useful information in the frequently asked questions and answers below:
FoxESS energy storage for solar power systems
Which FoxESS solution is better suited for homes, and which for larger projects?
The FoxESS P100 ESS all-in-one series offers a compact solution for single-phase, low-power-demand locations—such as single-family homes or small commercial properties—by It integrates the hybrid inverter and a 10.24 kWh LFP battery into a single unit, with inverter power ranging from 2.5 kW to 5 kW. The EP6 LV and EP12 battery modules are also ideal for residential and small commercial systems when paired with FoxESS hybrid inverters.
For larger commercial and industrial (C&I) projects, the Tmax and TMaxPlus BESS systems offer a professional solution: the Tmax 100/215 model combines a 100 kW inverter and 215 kWh storage capacity, while the TMaxPlus 125/241 combines 125 kW and 241 kWh in a single unit, featuring liquid cooling and built-in fire protection. These systems are designed to optimize energy supply for factories, logistics centers, and EV charging stations.
What does “all-in-one energy storage” mean?
In an all-in-one solution, the battery, hybrid inverter, and BMS are integrated into a single physical unit—eliminating the need to procure, size, and connect separate components. In the P100 ESS series, this takes the form of a wall-mountable unit, which is significantly faster and easier to install than systems built from separate components. The integration of energy storage and FoxESS inverters on a unified platform also minimizes conversion losses.
A particular advantage for installation partners is that, with an all-in-one system, responsibilities are clear: the complete solution comes from a single manufacturer with a single warranty, which also simplifies service processes.
What does DoD mean, and why is it important before purchasing?
DoD (Depth of Discharge) indicates, as a percentage, how much of the battery’s capacity can be used during a cycle without compromising its long-term lifespan. The FoxESS EP12 energy storage system, for example, has a 90% DoD, which means that out of a nominal capacity of 12 kWh, 10.8 kWh can realistically be drawn—this is the value you should use for return-on-investment calculations.
DoD is also closely related to lifespan: FoxESS storage systems based on LFP chemistry degrade less due to deep discharges than other lithium-based solutions. Before purchasing, it is therefore worth comparing not only the nominal capacity but also the DoD value and the guaranteed cycle count.
Can a FoxESS EP12 energy storage system be expanded later, for example?
Yes, the EP12 has a modular design: by connecting up to 4 units in parallel, a storage capacity of up to 46.08 kWh can be achieved. The expansion does not require a complete system replacement; the new module can be integrated into the original system provided compatible FoxESS inverters are operating alongside it.
The EP6 LV battery and larger C&I Tmax BESS systems can also be expanded. However, it is important to consider future capacity expansion plans during the initial design phase, as the sizing of the inverters and grid connection must align with the planned final capacity.
Does the energy storage system require special maintenance?
FoxESS LFP-based energy storage systems require minimal maintenance: they contain no moving parts, the cell chemistry does not require regular inspection or fluid replenishment, and the BMS automatically monitors the state of charge, temperature, and cell balance. Through the FoxCloud monitoring platform, the system’s status can be tracked in real time via a mobile app or web interface, allowing for the timely detection of any anomalies.
Annual inspections—tightening connectors, updating software, and checking communication between the inverter and the storage unit—are recommended, but these require minimal time and can be performed as part of routine solar system maintenance. The passive heat sink design of FoxESS inverters also contributes to low maintenance requirements, as they contain no fans or other moving parts.
Opinions and recommendations from SOLARKIT experts
Based on installer feedback and market experience, FoxESS energy storage systems are considered one of the best value-for-money solutions in Europe. In our experts’ experience, the P100 ESS all-in-one series has proven particularly popular among our installation partners: the unified platform and the native compatibility of FoxESS inverters significantly reduce installation time and the likelihood of errors. Through the FoxCloud monitoring platform, system performance can be tracked in real time via a mobile app, which offers a significant convenience advantage in daily operations.
We continue to receive positive feedback on the EP6 and EP12 battery modules regarding their compact size, easy scalability, and reliable daily operation.
For larger C&I projects, the Tmax BESS series has also received positive professional feedback, particularly regarding peak load reduction and managing grid capacity constraints. You’ll always find up-to-date inventory and pricing information in the SOLARKIT B2B webshop, and our dedicated sales representatives will help you select the FoxESS energy storage system that best fits your project’s needs.