Illustrative photo of the 25.6 V compression box
LiFePO4 battery
25.6 V / 290 Ah
Compression box LiFePO₄ battery 25.6 V / 290 Ah / 7.2 kWh, 8× EVE LF280K-D6-01. Bluetooth + CAN. JK BMS active balancer, handmade in the Czech Republic, 4-year warranty on the cells.
- Energy
- 7.2 kWh
- Capacity
- 290 Ah
- Cycle life
- 8,000 cycles
- Cell warranty
- 4 years
Variants of this pack
Other voltage or capacity · Compression box
What it's good for.
The compression box keeps the cells clamped, which benefits them especially under high load. The box can stand horizontally or vertically.
The BAKOM 25.6 V / 7.2 kWh battery pack is LiFePO₄ (lithium iron phosphate) storage made of eight prismatic EVE LF280K cells connected in series (8S1P) in a rigid compression box. It is intended for home and off-grid PV systems, backing up appliances and off-grid installations where a reliable, long-life energy source with a nominal voltage of 25.6 V is needed.
The compression box keeps the cells permanently clamped, which ensures optimum performance and service life, especially under higher load. The box can be placed horizontally or vertically. The pack is supplied either with Bluetooth only (BK72K) or with an added CAN connector (BK72K-C) for data communication with Victron, Deye, Growatt, GoodWe, MUST, Luxpower and other inverters. RS485 communication is available at extra cost, and an external LCD display can be added as an option.
Safety and optimum operation are handled by an advanced BMS (Battery Management System), which continuously monitors all critical values and intervenes immediately if limits are exceeded — it protects against overvoltage (OVP), deep discharge (UVP), overcurrent (OCP), short circuit (SCP) and temperature extremes, including blocking charging at sub-zero temperatures. An active balancer continuously equalises the voltage between cells and extends battery life. All operating data (cell voltages, SOC, current, temperatures) are available over Bluetooth in the BAKOM BMS mobile app.
Compared with common lithium chemistries, LiFePO₄ technology offers high safety and resistance to thermal runaway, a long life of thousands of cycles and the ability to be deeply discharged. The recommended operating range is 10–100 % of capacity; for an accurate state-of-charge reading, charge the battery to 100 % from time to time.
Installation and operation: Prepare cabling with a cross-section of at least 35 mm² (for currents up to 120 A) or 1× 50 mm² (up to 160 A) and provide suitable fusing for the power circuit. Once the box is in position, loosen the three nuts on the top plate by ¼ turn (19 mm spanner). We recommend connecting the battery to the DC installation while it is switched off and only then activating it with the ON/OFF switch (three beeps = ready for operation). Installation may only be carried out by a qualified person — the pack is within the safe voltage band of up to 75 V, but it stores 7.2 kWh of energy, so any short circuit between the terminals must be avoided. Interfering with the BMS configuration or the wiring voids the warranty.
This variant (BK72K-C): Communication: Bluetooth, CAN; LCD display optional.
Technical specifications.
Values for the BK72K-C variant. The charge and discharge limits match the BMS settings the battery leaves the workshop with.
- Nominal voltage
- 25.6 V (8S)
- Capacity
- 290 Ah
- Energy
- 7.2 kWh
- Chemistry
- LiFePO₄ (lithium iron phosphate)
- Cells
- 8× EVE LF280K-D6-01
- BMS
- JK B2A8S20P
- Balancer
- active, 2 A
- Continuous current (charge and discharge)
- 150 A
- Peak current
- 200 A / 20 s
- Cycle life
- 8,000 cycles to 70% capacity
- Charging — temperature
- +1 to +55 °C
- Discharging — temperature
- −22 to +55 °C
- Charging: absorption / float
- 27.9 V / 27.4 V
- Discharge cut-off (recommended)
- 24.0–24.5 V
- Communication
- Bluetooth, CAN
- LCD display
- optional
- Build
- Compression box
- Dimensions
- 45×40×25 cm
- Weight
- 51.5 kg
- Production
- handmade, Czech Republic
- Warranty
- 4 years on the cells
Energy = capacity × average discharge voltage (3.125 V per cell), i.e. the energy the battery delivers between the BMS limits. Cycle life is stated by the cell manufacturer for 25 °C; actual life depends on operating conditions. The 4-year warranty applies to the cells; the BMS and other electronics are covered as set out in the warranty certificate.
Ready to connect.
Each battery leaves the workshop with its BMS set up and after a final test. Every battery comes with a report of the measured cell capacity and a warranty certificate.
- Battery with the BMS configuredWe set the protections according to the battery type and the communication according to your inverter.
- Cell capacity reportMeasured capacity and internal resistance of each cell, and the result of the final test.
- Manual and warranty certificateWiring procedure, recommended inverter settings and warranty terms.
- Inverter cableIncluded with 48 and 51.2 V batteries with BMS+ according to the ordered configuration; for other batteries at extra cost.
- BAKOM BMS app and BAKOM CloudBattery status and cell voltages on your phone via Bluetooth, history and settings on the web. Free for BAKOM batteries.
What you ask us.
Didn't find your answer? Call or write to us — we'll help you choose and connect it.
When will I receive the battery?
We build batteries by hand to order and do not keep them in stock. After your inquiry we confirm the current lead time and put you in the order queue — the reservation is free and non-binding. We contact you before production starts.
Do I pay a deposit?
No. We build and test the battery, then send the invoice and dispatch the battery once payment has arrived. Smaller batteries go by PPL, heavier ones on a pallet; the shipping cost is stated in the quote. Collection in person is possible by arrangement near Klatovy or near Ostrava.
Will the battery communicate with my inverter?
CAN variants communicate with Victron, Deye, Growatt, GoodWe, MUST, Luxpower and other inverters, and via RS485 with, for example, Voltronic inverters. With a Victron system (Cerbo GX), it is the CAN variants that communicate. Our batteries are low-voltage — they do not work with high-voltage (HV) hybrid inverters. Send us your inverter type and we will check.
Can I charge the battery in winter?
Below +1 °C the BMS blocks charging to protect the cells and allows it again above +4 °C. Discharging is possible down to −22 °C. For unheated spaces there are variants with HEAT heating (suffix H), which warm the cells before charging.
What charging voltage should I set?
12.8 V: absorption 14.1 V, float 13.8 V · 25.6 V: 27.9 / 27.4 V · 51.2 V: 55.8 / 54.7 V · 48 V (15 cells): 52.3 / 51.3 V. The BMS protection voltage (3.56 V per cell) is not a charging target. For 15-cell batteries, do not use profiles for 51.2 V or for lead-acid batteries.
Is the inverter communication cable included?
For 48 V and 51.2 V batteries with BMS+ (RC variants), yes, depending on the configuration ordered. For 12.8 V and 25.6 V packs we supply it at extra cost or make one to measure.
Can I add another battery later?
Variants with BMS+ (BK8K-RC and the 48/51.2 V RC series) can be connected in parallel; up to 16 batteries with the same BMS version can be addressed. Each battery is connected separately to the DC busbar with cables of the same length and cross-section — daisy-chaining power cables from battery to battery is not permitted. For more than two batteries we go through the set-up with you in advance.
What is the difference between the AkuBox and a compression box?
The compression box keeps the cells clamped, which benefits their life especially under high load; it can stand horizontally or vertically. It is an open design, so it belongs in a lockable technical room. The AkuBox is a closed enclosure that protects the battery from damage and unauthorised tampering — made of plastic for 12.8 and 25.6 V. The metal AkuBox BK16A-RC also has a built-in display and an isolator switch.
How many cycles will the battery last?
Packs built from EVE LF280K and MB31 cells last 8,000 cycles until capacity drops to 70 %, 105 Ah packs 4,000 cycles to 80 % (cell manufacturer's data at 25 °C). Actual life depends on temperature, currents and depth of discharge.
How should I store the battery over winter?
If the battery will be out of use for more than a week, switch it off. Store it in a dry place, charged to roughly 40–80 %, and top it up every three months. Never leave it fully discharged.
How can I monitor the battery remotely?
The BAKOM BMS app connects to the battery via Bluetooth. The BAKOM Cloud web portal then keeps your batteries, measurement history and settings in one place — you add a battery to your account with the QR code on its label. More on the App page.
Am I allowed to change the BMS settings?
We set the protection parameters in the workshop according to the battery type. Normal user functions in the BAKOM BMS app do not void the warranty; changing the protection configuration, changing the administrator password or modifying the wiring does.
Interested in the BK72K-C?
Send us a message.
Add the quantity, the type of inverter or appliance and your timing. We check that the pack suits your system and send a quote with a delivery date.
- baterie@bakom.czInquiries, orders and technical questions
- Bronislava Baxová
- +420 737 344 853Orders, lead times, invoices and dispatch
- Petr Baxa
- +420 603 552 577Production, wiring of batteries and Deye inverters
- Michal Komenda
- +420 602 564 571Technical matters, off-grid systems and Victron, BAKOM BMS app
- Workshops
- Svrčovec near Klatovy and Krmelín near OstravaVisits and collection by appointment only