Description
Independent module-level power control without aging bottlenecks.
EcoFlow OCEAN 2 Battery 5.02 kWh (EF BD-5-S2) is a next-generation high-voltage LFP modular battery brick with an integrated 800 V DC-DC power stage, built-in aerosol fire suppression, and automated sub-zero self-heating, engineered for cable-free stacking under EcoFlow OCEAN 2 hybrid inverters.
Integrated 800 V DC-DC Power Stage
Each module regulates voltage independently, preventing older battery packs from dragging down newly added expansion modules.
Built-in Winter Self-Heating (-20 °C)
Internal thermal elements warm cells automatically before charging in unheated winter garages and outdoor alcoves.
Cable-Free Slide-and-Lock Interlocking
Internal self-aligning busbar terminals eliminate exposed high-voltage DC jumper cables and wiring errors during stacking.
Integrated Aerosol Fire Protection
Each pack includes factory-installed thermal-activated aerosol fire suppression for maximum residential peace of mind.
More product details
In traditional high-voltage battery stacks, connecting modules in rigid series means a single degraded cell limits the entire tower. The EF BD-5-S2 incorporates an active 800 V DC-DC converter in each pack.
- Active bidirectional DC-DC converter regulates output voltage independently.
- Allows adding new battery packs years later without capacity degradation or SOC imbalance.
- Internal busbar contacts pass power and communication directly between stacked modules.
EcoFlow OCEAN 2 (LFP Battery)
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Certified outdoor reliability down to -20 °C with active fire suppression.
Charging lithium batteries in sub-zero winter temperatures causes irreversible lithium plating. The EF BD-5-S2 includes integrated PTC heating elements and thermal aerosol fire suppression. Auto-heating warms battery cells to optimal charging temperatures using solar or grid power. Thermal-activated aerosol module suppresses thermal runaway in milliseconds without water. Upgraded IP66 weatherproof casing certified for exposed outdoor wall installations (-20 to +50 °C).
Holds 4.85 kWh of usable LFP
Usable is 4.85 kWh at 0.2C, 100 percent depth of discharge, 25 C, beginning of life. One brick, one figure.
Grows to 30.12 kWh on one floor stack
One to six modules: 5.02, 10.04, 15.06, 20.08, 25.10, 30.12 kWh. Twelve modules can sit on one OCEAN 2 three-phase inverter.
Pairs with PowerOcean gen-1 packs
Mixed stacks are supported. The mixed stack stops at four modules.
Technical data
Decentralized power regulation and active winter heating engineered for multi-year modular expansion.
5.02 kWh next-gen high-voltage LFP module with 800 V DC-DC and sub-zero auto-heating.
Purpose-built for EcoFlow OCEAN 2 hybrid systems, each EF BD-5-S2 module integrates an 800 V DC-DC converter, active cell heating, and modular plug-and-play stacking. It delivers high power density with integrated fire suppression, allowing full-speed charging down to -20 °C without capacity loss or cell degradation.
- Modular Energy
- 5.02 kWh
- Regulated Bus
- 800 V DC
- Sub-Zero Ready
- Auto-Heating
- External DC Conduits
- Zero
Battery: Performance
- Nominal capacity
- 5.02 kWh per module
- Usable capacity
- 4.85 kWh (0.2C, 100% DoD, 25 °C, beginning of life)
- Cell chemistry
- LiFePO4 (LFP)
- Nominal charging / discharging power
- 2.5 kW / 3.4 kW per module
- Max. discharging power
- 4,080 W (sustained ≥20 minutes, lab conditions)
- Nominal voltage / operating range
- 400/800 V; 360–520 V / 720–960 V
- Cycle life
- 10,000+ battery cell cycles (EcoFlow claim)
- Depth of discharge
- 100%
Scaling & Stack Configurations
- Stack configurations
- BD-5-S2 5.02 → BD-10 10.04 → BD-15 15.06 → BD-20 20.08 → BD-25 25.10 → BD-30-S2 30.12 kWh per tower (1–6 modules)
- Per-stack charge / discharge power (800 V)
- 1 module: 2.5/3.4 kW2: 5.0/6.8 kW · 3: 7.5/10.2 kW · 4: 10.0/13.6 kW · 5: 12.5/17.0 kW · 6: 15.0/20.4 kW
- Modules per stack
- Floor stand: up to 6 batteries per stack (up to 4 stacks in parallel)wall mounted: up to 3
- Modules per inverter
- Up to 12 modules on OCEAN 2 three-phase / OCEAN 2 Plus single-phase (9 on PowerOcean three-phase, 6 on single-phase OCEAN 2 / PowerOcean 1ph) per EcoFlow's compatibility matrix
- Compatible inverters
- OCEAN 2 Hybrid Inverter Three-Phase, OCEAN 2 Plus Single-Phase, OCEAN 2 Single-Phase, PowerOcean Three-/Single-Phase, PowerOcean Plus Three-Phase
- Mixed stacking with PowerOcean gen-1 packs
- Supported (hybrid stacking)max 4 modules per stack in mixed use
- Communication
- CAN
General / Enclosure
- Dimensions / weight per module
- 680 × 196 × 279 mm (W×D×H)46 kg — 279 mm module height, footprint under 0.15 m²
- Ingress protection
- IP66 (indoor/outdoor)bottom battery module rated for up to 72 h water immersion under specified test conditions
- Operating / storage temperature
- -20 °C to +55 °C operating (derating above 40 °C)-25 °C to +60 °C storage · max. 3,000 m altitude
- Cooling
- Natural cooling (no fans in the battery)
- Battery protections
- Over-charge/discharge, over-/under-voltage, over-current, short-circuit, reverse-polarity, temperature, thermal-runaway, leakage-current, insulation, over-pressure protection, automatic power-off, emergency shutdownBMS embedded per pack · active aerosol fire-protection module in every pack
- Warranty
- 15 years (capacity-retention terms per EcoFlow warranty policy)
- Packaging (VPE)
- 1 per carton, 10 per pallet
Project fit
Where this model fits.
Scenarios that show which projects the EcoFlow OCEAN 2 Battery 5.02 kWh (EF BD-5-S2) belongs in, what to verify before quoting, and when another model is the better pick.
Modular Storage Stacking for EcoFlow OCEAN 2 Systems (5.02 to 20.08 kWh)
Installing or expanding an EcoFlow OCEAN 2 single-phase or three-phase hybrid storage tower.
Stacking 1 to 4 modules vertically provides 5.02 kWh, 10.04 kWh, 15.06 kWh, or 20.08 kWh in a single lean column.
- BoundaryIf the household requires larger capacity per module slot to reach 24 kWh or 32 kWh in fewer vertical bricks, step up to the OCEAN 2 8.0 kWh Battery (EF BD-8-S2). ---
- If the household requires larger capacity per module slot to reach 24 kWh or 32 kWh in fewer vertical bricks, step up to the OCEAN 2 8.0 kWh Battery (EF BD-8-S2). ---
Documents
EcoFlow OCEAN 2 Three-Phase Hybrid Inverter Datasheet EcoFlow OCEAN 2 LFP Battery 5kWh User ManualProduct questions
What is the main upgrade in the OCEAN 2 battery compared to the first-generation PowerOcean battery?
IP66 environmental sealing, higher cell energy density, and compatibility with 8 kWh bricks. The OCEAN 2 series upgrades weather protection to IP66 (certified against high-pressure water jets), features a lighter and more compact mechanical casing, and allows mixing with 8.0 kWh large-format modules on the same platform.
System components
Required components
EcoFlow OCEAN 2 hybrid inverter (e.g. HD-P3-10K0-S2)
Item number: DLK-ECOFLOW-EFHDP310K0S2
The battery must only be operated with EcoFlow hybrid inverters (OCEAN 2 three-phase / OCEAN 2 Plus single-phase / PowerOcean); it is the inverter that provides grid connection, backup switching and HEMS control.
EcoFlow OCEAN 2 LFP Battery Base
Item number: DLK-ECOFLOW-OCEAN2-BASE
Floor-standing towers stack on the OCEAN 2 battery base (adjustable levelling feet, spirit level, click-on terminal), one base per stack of up to 6 modules.
Recommended components
EcoFlow Battery Stack Bridge
Item number: DLK-ECOFLOW-STACK-BRIDGE
For dual-tower systems: bracket that rigidly ties adjacent towers (OCEAN 2 base spacing 94.6-104.5 mm); EcoFlow recommends bracing both sides of each battery unit and seismic restraint where applicable.
Optional components
EcoFlow Battery Junction Box
Item number: DLK-ECOFLOW-EFBDJCS1
Required only for cascaded multi-stack configurations (up to 3 junction boxes in parallel; built-in 1500 V DC / 32 A fuse and battery switch). A single stack under the integrated OCEAN 2 inverter does not need one.
EcoFlow PowerOcean LFP Battery 5.1 kWh (BD-5.1-S1, gen 1)
Item number: DLK-ECOFLOW-EFBD51S1
Cross-generation mixing is supported (max 4 modules per stack in mixed use), relevant when expanding an existing PowerOcean installation with OCEAN 2 hardware.
Approved pairings
EcoFlow OCEAN 2 HD-P1-10K0-S2 (10 kW single-phase hybrid, 2026 flagship)Item number DLK-ECOFLOW-EFHDP110K0S2Up to 12 EF BD-5-S2 modules per inverter; a stack holds 6 floor-mounted or 3 wall-mounted, so 12 modules means two towers. Mixed stacking with the older PowerOcean LFP module is supported (OCEAN 2 battery manual p7).
EcoFlow OCEAN 2 HD-P1-12K0-S2 (12 kW single-phase hybrid, 2026 flagship)Item number DLK-ECOFLOW-EFHDP112K0S2Up to 12 EF BD-5-S2 modules per inverter; a stack holds 6 floor-mounted or 3 wall-mounted, so 12 modules means two towers. Mixed stacking with the older PowerOcean LFP module is supported (OCEAN 2 battery manual p7).
EcoFlow OCEAN 2 HD-P1-6K0-S2 (6 kW single-phase hybrid, 2026 flagship)Item number DLK-ECOFLOW-EFHDP16K0S2Up to 12 EF BD-5-S2 modules per inverter; a stack holds 6 floor-mounted or 3 wall-mounted, so 12 modules means two towers. Mixed stacking with the older PowerOcean LFP module is supported (OCEAN 2 battery manual p7).
EcoFlow OCEAN 2 HD-P1-8K0-S2 (8 kW single-phase hybrid, 2026 flagship)Item number DLK-ECOFLOW-EFHDP18K0S2Up to 12 EF BD-5-S2 modules per inverter; a stack holds 6 floor-mounted or 3 wall-mounted, so 12 modules means two towers. Mixed stacking with the older PowerOcean LFP module is supported (OCEAN 2 battery manual p7).
EcoFlow OCEAN 2 HD-P3-10K0-S2 (10 kW three-phase hybrid, 2026 flagship)Item number DLK-ECOFLOW-EFHDP310K0S2Up to 12 EF BD-5-S2 modules per inverter; 6 per tower floor-mounted, 3 wall-mounted.
EcoFlow OCEAN 2 HD-P3-12K0-S2 (12 kW three-phase hybrid, 2026 flagship)Item number DLK-ECOFLOW-EFHDP312K0S2Up to 12 EF BD-5-S2 modules per inverter; 6 per tower floor-mounted, 3 wall-mounted.
EcoFlow OCEAN 2 HD-P3-6K0-S2 (6 kW three-phase hybrid, 2026 flagship)Item number DLK-ECOFLOW-EFHDP36K0S2Up to 12 EF BD-5-S2 modules per inverter; 6 per tower floor-mounted, 3 wall-mounted.
EcoFlow OCEAN 2 HD-P3-8K0-S2 (8 kW three-phase hybrid, 2026 flagship)Item number DLK-ECOFLOW-EFHDP38K0S2Up to 12 EF BD-5-S2 modules per inverter; 6 per tower floor-mounted, 3 wall-mounted.