The EcoFlow OCEAN 2 LFP Battery 8kWh (EF BD-8-S2) is a high-voltage lithium iron phosphate (LiFePO4) storage module for the EcoFlow OCEAN 2 solar and hybrid inverter system. It delivers 8.03 kWh nominal capacity (7.76 kWh usable) with a 4.1 kW nominal charge and discharge rate and a maximum short-term discharge of 6.4 kW, giving a single module the punch to support large household loads.
Each module is only 196 mm deep and stands 378 mm high, so the stack fits tight plant rooms, garages and outside walls. Build a floor-standing stack of up to 6 batteries or a wall-mounted stack of up to 3, and add capacity later without replacing what you already have. The IP66-rated enclosure, -20 to 55 °C operating range and intelligent air cooling make it suitable for demanding UK installations, backed by up to 10,000 battery cell cycles.
8.03 kWh
Nominal capacity
4.1 kW
Nominal charge / discharge
6.4 kW
Max discharge (short-term)
10,000
Battery cell cycles
Safety and regulatory
This is a high-voltage DC battery system (360-520 V / 720-960 V operating range). It must be installed, wired and commissioned by a suitably qualified electrician in accordance with BS 7671 and the manufacturer's installation manual. Complete the system's G98 / G99 grid connection notification or application as required, and do not open the battery enclosure.
Compatibility
The battery is not a standalone unit. It must be paired with an EcoFlow OCEAN 2 hybrid inverter, and depending on the inverter design a battery junction box may be required, so check the installation manual for your system. OCEAN 2 supports mixed use of Gen 1 and Gen 2 battery packs within the same system, including the 5 kWh module.
Peak discharge limits
The 6.4 kW maximum discharge is a short-term figure: in laboratory conditions at 25 °C ambient and device temperature, the discharge time at this power is no more than 30 minutes. Power may be derated above 40 °C and above 2,000 m altitude.
Warranty
EcoFlow provides a 10-year compulsory warranty on the OCEAN 2 LFP Battery 8kWh, with an optional 5-year extension available.
Key features
Modular, stackable design
Floor-standing stacks of up to 6 batteries or wall-mounted stacks of up to 3. Start with the capacity you need and expand as your home grows.
Slim 196 mm profile
At 680 x 196 x 378 mm, the clean stackable design simplifies site selection and keeps the footprint small.
IP66 weather protection
IP66-rated with a -20 to 55 °C operating range, 0% to 100% relative humidity and operation up to 3,000 m.
High discharge power
Up to 6.4 kW maximum discharge per module for powering multiple loads at once, with intelligent air cooling to manage heat.
Multi-layer safety
Protection against thermal runaway, over-charge, over-discharge, short-circuit, reverse-polarity, leakage-current and over-pressure faults, plus water ingress detection and emergency shutdown.
Long-life LFP chemistry
Up to 10,000 battery cell cycles for long-term durability, with a 10-year warranty and an optional 5-year extension.
Technical specification
Performance
Battery nominal capacity
8.03 kWh
Battery usable capacity
7.76 kWh
Battery cell type
LiFePO4
Nominal charging power
4.1 kW
Nominal discharging power
4.1 kW
Maximum discharging power
6.4 kW (short-term, up to 30 minutes)
Nominal voltage
400 V / 800 V
Operating voltage range
360-520 V / 720-960 V
General
Dimensions (W x D x H)
680 x 196 x 378 mm
Installation
Floor stand: stack of up to 6 batteries
Wall mounted: stack of up to 3 batteries
Cooling method
Intelligent air cooling
Ingress protection rating
IP66
Communications method
CAN
Environmental
Operating temperature
-20 to 55 °C (power may be derated above 40 °C)
Storage temperature
-25 to 60 °C
Maximum operating altitude
3,000 m (power may be derated above 2,000 m)
Relative humidity
0% to 100%
Protection and compliance
Protection
Over-charge / over-discharge, over-voltage / under-voltage, over-current, short-circuit, reverse-polarity, temperature, thermal-runaway, leakage-current, insulation, over-pressure, automatic power-off, emergency shutdown and water ingress detection
Standards
IEC/EN 62619, IEC/EN 62040-1, IEC/EN 62477-1, ISO 13849-1, VDE-AR-E 2510-50, EN IEC 61000-6-1, EN IEC 61000-6-2, EN IEC 61000-6-3, EN IEC 61000-6-4, UN 38.3, SA TS 5398
Warranty
10 years compulsory, optional 5-year extension
Usable capacity is measured at 100% depth of discharge, 0.2C charge and discharge at 25 °C, at the beginning of life. Specifications are subject to change by the manufacturer without notice.
Frequently asked questions
Can the OCEAN 2 8kWh battery be used on its own?
No. It is a high-voltage battery module that must be connected to an EcoFlow OCEAN 2 hybrid inverter. Depending on the inverter design, a battery junction box may also be required, so confirm the exact configuration in the installation manual before ordering.
How many batteries can I stack?
A floor-standing stack can hold up to 6 batteries and a wall-mounted stack up to 3. OCEAN 2 supports mixing Gen 1 and Gen 2 packs, so you can combine the 8kWh and 5kWh modules in the same system.
What is the difference between nominal and usable capacity?
Nominal capacity is 8.03 kWh. Usable capacity is 7.76 kWh, measured at 100% depth of discharge and 0.2C charge and discharge at 25 °C at the beginning of life.
Can it be installed outdoors?
Yes. The enclosure is IP66-rated and the operating range is -20 to 55 °C. Power may be derated above 40 °C and above 2,000 m, and the maximum operating altitude is 3,000 m. Always follow the manufacturer's siting and clearance guidance.
What does the 6.4 kW maximum discharge mean in practice?
It is a short-term peak. Nominal charge and discharge are 4.1 kW, while the module can deliver up to 6.4 kW for no more than 30 minutes under laboratory conditions at 25 °C. Total system output also depends on the connected inverter and the number of batteries.
What warranty does it carry?
The 8kWh battery comes with a 10-year compulsory warranty and an optional 5-year extension. Warranty terms are set by the manufacturer, so refer to the official policy for conditions.
