Deye BOS-B (15 modules in series; system config shown)

193.05 kWh usable LFP High voltage

Compare with closest alternative Datasheet PDF

Usable (kWh)

193.05

Strong · top 8%

Round-trip (%)

90.0

Typical · median 90.5%

Power (kW)

Not published

Cycles

6000

Typical · median 6000

Weight (kg)

1850.0

Strong · top 3%

Warranty (yrs)

Typical · median 10 yrs

The Deye BOS-B energy storage series is a modular solution for hybrid installations, where reliable operation, fast power switching, and convenient real-time energy management are crucial. Its key advantage lies in the LiFePO4 (LFP) chemistry - compared to NMC, it offers enhanced thermal safety, high tolerance to intensive operation, and predictable aging, which is essential both in commercial settings and critical applications.

The BOS-B stands out with its scalability - the system can be expanded modularly, adapting the capacity to increasing energy consumption or higher PV power, without replacing the entire infrastructure. A separate BMS ensures balanced utilization of the battery packs, managing balancing and protecting the batteries during daily operation.

The declared high cycle life and a 10-year warranty translate to a genuinely lower long-term energy storage cost. The BOS-B is designed for compatibility with C&I systems and hybrid inverters, making it suitable for homes, businesses, as well as backup and off-grid systems.

Ranking

19 batteries of 50 kWh and up

Metric This battery Median Position in class Rank in class

Round-trip efficiency 90.0% 90.5% Typical 2

Power per kWh - 0.62 Not published -

Cycle life 6000 6000 Typical 1

Weight per kWh 9.6 11.2 Strong · top 3% 1

Warranty 10 yrs 10 yrs Typical 1

Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

See 44 Deye offers

Specifications

Open datasheet PDF

Usable energy 193.05 kWh What the battery delivers, full to empty

Nominal energy 214.50 kWh What the cells hold

Depth of discharge 90 %

Module energy 14.30 kWh

Modules per stack 5 to 15

Max system capacity 214.5 kWh

Units in parallel 20

Max discharge current 140 A

Max charge current 140 A

Peak discharge current 160 A

Round-trip efficiency 90.0 %

Cycle life 6000 cycles At 90 % depth of discharge

Capacity at end of life 70 %

Voltage class High voltage

Nominal voltage 720.0 V

Cell technology LFP

Cell management Cobalt-freeActive balancingThermal management

Dimensions 1136 × 2150 × 800 mm Height × width × depth

Weight 1850.0 kg 9.6 kg per kWh

Enclosure IP20

Mounting rack

Cooling active-air

Operating temperature -20 to 55 °C

Protocols TCPRS485CAN

Warranty 10 years

Certifications CEIEC 62619IEC 62040UN38.3

Pros and cons

5 positive · 2 caution

What owners get

LFP (Lithium Iron Phosphate) cells - high thermal stability

The LiFePO4 chemistry provides a self-ignition temperature above 270°C (compared to ~150°C for NMC), which eliminates the risk of thermal runaway in C&I installations. The system operates within a temperature range of -20°C to 55°C without compromising performance, as confirmed by IEC 62619 certification.

More than 6,000 cycles at 0.5°C

The manufacturer states that the battery can undergo more than 6,000 full charge/discharge cycles at a 0.5C current, which, with daily use, corresponds to more than 16 years of operation. The round-trip efficiency reaches 97.6%, minimizing energy conversion losses in a daily cycle.

Scalable up to 3.44 MWh per PCS

Modular architecture allows for configuring a rack with 5-15 modules (maximum 214.5 kWh per rack) and connecting up to 16 racks to a single PCS, resulting in a total of 3.44 MWh - without the need to replace infrastructure when expanding a PV installation or increasing energy demand.

Standalone BMS with multi-protocol communication

The built-in BMS supports simultaneous communication via TCP/IP, RS485, and CAN, enabling integration with SCADA systems and hybrid inverters from various manufacturers. Active cell balancing extends battery pack lifespan and protects against uneven aging.

CE, IEC 62619, UN38.3 certifications

Verified by independent laboratories, the package of standards (CE, IEC 62619, IEC 62040, UN38.3) allows for legal implementation in commercial installations within the EU without the need to obtain additional exemptions - which is particularly important for projects funded by the KPO/FEnIKS program.

Trade-offs

10-year warranty - below the segment leaders

The declared design life is 10 years, which aligns with the warranty period. Direct competitors in the C&I class - Sigenergy SigenStor offers a 12-year warranty, while BYD MC Cube-T standardly offers a 10-year warranty with the option to extend it to 20 years. Without the option to extend the warranty, when calculating LCOE over 15+ years, this increases the financial risk for the investor.

Standard BOS-B being replaced by Pro-A3

Deye has introduced the BOS-B Pro-A3 variant with 16.08 kWh modules (compared to 14.3 kWh in the standard BOS-B) and a 257 kWh rack per cluster. New distributors are being encouraged to adopt the Pro-A3, which may mean limited availability of accessories and expansion modules for the standard BOS-B version over the next 3-5 years.

Alternatives

All Deye batteries

Battery Usable Round-trip Power Voltage Difference

Deye BOS-B (15 modules in series; system config shown) 193.05 kWh 90.0% - High voltage You are here

LUNA2000-200KWH-2H1 193.5 kWh - 100.0 kW HV +0.4 kWh

BC197DE 177.3 kWh - - HV -15.8 kWh

LUNA2000-161KWH-2H1 161.3 kWh - 100.0 kW HV -31.8 kWh

BOS-A (23 modules in series) 158.98 kWh - - HV -34.1 kWh

LX C156-10 156.67 kWh - 65.3 kW HV -36.4 kWh

About the BOS-B series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this model's own.

What is the warranty on the Deye BOS-B energy storage system?

The Deye BOS-B is covered by a 10-year manufacturer's warranty, which covers both capacity performance and manufacturing defects. Due to the LiFePO4 chemistry, which is characterized by predictable aging and high resistance to intensive use, the actual lifespan of the system can exceed the warranty period, effectively reducing the cost of energy storage per cycle.

How many modules can be connected to the Deye BOS-B system, and what is the maximum capacity of the installation?

The BOS-B series is designed as a modular, scalable system, where modules are connected in series. Configurations range from 5 to 16 battery modules per rack. This allows for the creation of storage systems ranging from several tens to over 200 kWh per rack, and with the connection of multiple racks, the system's capacity can reach levels of 100 kW - 2.5 MW, suitable for commercial and industrial applications.

Does the Deye BOS-B system function properly in winter and at low temperatures?

Yes, the Deye BOS-B system operates within a temperature range of -20°C to +55°C, which ensures full functionality in Polish winter conditions. The integrated active cooling system with a fan manages temperature during intensive charging and discharging, and the LiFePO4 battery cells maintain stable electrochemical parameters at low temperatures better than the NMC chemistry used in older solutions.

Which hybrid inverters are compatible with the Deye BOS-B?

BOS-B is designed for compatibility with Deye hybrid inverters from the SG01HP3 and SG05LP3 series, and communication is achieved through TCP, RS485, and CAN ports. This allows for integration with selected inverters from other manufacturers that support these protocols. However, it is advisable to confirm the specific inverter-battery combination with the installer before purchase, as the manufacturer regularly updates the list of certified compatible products.

What are the key differences between Deye BOS-B LiFePO4 battery cells compared to standard NMC battery cells used in other energy storage systems?

The LiFePO4 (LFP) cells used in the BOS-B system are characterized by higher thermal stability - they do not undergo rapid thermal runaway, which is a risk with NMC chemistry. This translates to increased safety for both residential and commercial installations. Furthermore, LFP cells age more predictably and linearly, which makes it easier to plan battery replacements and reduces the actual cost of owning the system over a period of 10 years or more.

Is the Deye BOS-B suitable for emergency and off-grid applications, or only for optimizing self-consumption?

BOS-B supports both self-consumption optimization mode and emergency operation with a quick switchover (similar to UPS), and, with the appropriate inverter, can participate in off-grid or hybrid systems with a generator. The system is designed for C&I (Commercial & Industrial) installations, such as businesses, factories, and facilities requiring continuous power, but it can also be used in advanced prosumer installations with a focus on energy safety.

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