The EcoFlow Ocean 2 5.02kWh Battery (model EF BD-5-S2) is a stackable LiFePO4 (LFP) battery module designed to work with the EcoFlow Ocean 2 hybrid inverter range. Each module stores 5.02kWh of usable energy and can be combined with up to five further modules to build a scalable home battery system, all sharing the same compact, pre-integrated design.
Built for both indoor and outdoor installation, the battery features an ultra-compact footprint and a multi-layer safety architecture covering the cell, module and system level. It is cross-generation compatible with EcoFlow's earlier PowerOcean LFP batteries, supporting flexible system upgrades over time.
5.02 kWh
Nominal Capacity
2.5 kW
Nominal Charge Power
3.4 kW
Nominal Discharge Power
Key Features
Stackable Modular Design
Each module stacks directly onto the next with built-in handles and captive side screws, allowing a system to be expanded up to six modules per inverter without extra wiring or covers.
Long Cycle Life
Rated for 10,000+ charge cycles using LiFePO4 (LFP) cell chemistry, supporting many years of daily charge and discharge use.
Multi-Layer Safety Architecture
Protected by 6 layers of passive protection and 4 layers of active protection, including aerogel thermal insulation, a built-in fire prevention module and cloud BMS early warning.
IP66 Weatherproof Rating
Rated to IP66 for robust protection against dust and water ingress, suitable for both indoor and outdoor installation.
Cross-Generation Compatible
Fully compatible with EcoFlow's earlier PowerOcean LFP battery range, allowing existing systems to be expanded without full replacement.
15-Year Warranty
Backed by a 15-year manufacturer warranty, reflecting the expected long-term durability of the LFP cell design.
Technical Specifications
General
Product Type
Stackable Home Battery Module
Cell Chemistry
LiFePO4 (LFP)
Performance
Nominal Capacity
5.02 kWh
Nominal Voltage
400V / 800V
Operating Voltage Range
360–520V / 720–960V
Nominal Charging Power
2.5 kW
Nominal Discharging Power
3.4 kW
Cell Cycle Life
10,000+ cycles
Physical & Environmental
Dimensions (W×D×H)
680 × 196 × 279 mm
Operating Temperature
-20°C to 55°C
Storage Temperature
-25°C to 60°C
Max. Operating Altitude
3000 m
Cooling Method
Natural convection
Environmental Category
Outdoor / Indoor
Compliance
Safety Standards
IEC/EN 62619, IEC/EN 62040-1, IEC/EN 62477-1, ISO 13849-1, VDE-AR-E 2510-50
EMC
EN 61000-6-1, EN 61000-6-2, EN 61000-6-3, EN 61000-6-4
Important Safety Information: This battery module requires a compatible EcoFlow Ocean 2 hybrid inverter and must not be used with inverters or batteries from other manufacturers. Installation and electrical connections must be carried out by a qualified, MCS-certified installer in accordance with the manufacturer's installation guide.
Frequently Asked Questions
How many of these batteries can I install with one inverter?
A single Ocean 2 inverter supports a floor-standing stack of up to six 5.02kWh battery modules, giving a maximum capacity of 30.12kWh per inverter.
What is the difference between nominal and usable capacity?
This battery has a 100% depth of discharge, meaning the full 5.02kWh nominal capacity is usable, unlike some battery chemistries which reserve a portion of capacity to protect cell health.
Is this battery compatible with older EcoFlow systems?
Yes, it is cross-generation compatible with EcoFlow's PowerOcean LFP battery range, allowing existing PowerOcean systems to be expanded using Ocean 2 modules, subject to stacking order guidance.
Can this battery be installed outdoors?
Yes, it carries an IP66 ingress protection rating and is designed for both indoor and outdoor installation, within the specified operating temperature range.
What warranty does this battery carry?
The Ocean 2 5.02kWh battery is backed by a 15-year manufacturer warranty.
