EcoFlow EF BD-5.1-S1
EcoFlow PowerOcean EF BD-5.1-S1 is the 5.1 kWh LFP battery pack of the PowerOcean residential system.
- 3 kW to 6 kW single-phase (EF HD-P1) and 6 kW to 12 kW three-phase (EF HD-P3) inverters cover residential through small-commercial loads on the same PowerOcean platform.
- Battery capacity builds in 5.1 kWh EF BD-5.1-S1 packs: up to 15.3 kWh on a single HD-P1 inverter (cascadable to about 45 kWh across three HD-P1 units), or up to 45.9 kWh directly on a single HD-P3 three-phase inverter.
- IP65-rated inverters and battery stacks are specified for -20 to 50 degrees C, so they can sit outdoors or in an unheated plant room.
- Built-in RS485, CAN, Wi-Fi, Bluetooth and 4G give direct EcoFlow app monitoring without extra gateway hardware.
- 4.8 kWh
- Usable energy
- 5.1 kWh
- Nominal energy
- 800 V
- Nominal voltage
- LFP
- Cell chemistry
- Manufacturer
- EcoFlow
- Model code
- EF BD-5.1-S1
- Item no.
- DLK-ECOFLOW-EFBD51S1
- Delivery
- Germany delivery estimate: EUR 85–205 · The final delivery charge is included in your Proforma.
Plan with EF BD-5.1-S1
New system, extension or replacement? Linker Advisor starts from this article and asks only for what is still open — existing model, quantity, postcode, installation date.
Figures transcribed from the manufacturer datasheet on file. Confirm your grid code and configuration with our engineers before ordering.
- GoodWe · SAJ · Pylontech · EcoFlow · Chint paired from the maker’s own lists
- Datasheets on file for every item
- Within 24 h engineering response
- MOQ 1 unit · EU delivery
- Engineering-checked configurations
Numbers that survive the bank's site audit.
Every figure below comes from the manufacturer datasheet on file — the same document your lender's technical advisor will request.
Usable energy
Voltage
Depth of discharge
Size it to the load. Grow it later.
5.1 kWh per stack today; add modules when the load grows instead of guessing on day one.
Capacity
5.1 kWh nominal, 4.8 kWh usable at 95 percent depth of discharge, LFP cells.
Inspect it before you spec it.
Official renders, installation photos and system panels for this model line.
Manufacturer imagery from EcoFlow's official documentation.
EcoFlow PowerOcean battery pack seated on its base, official render
EcoFlow PowerOcean system at a residence, official EcoFlow brochure render
Installer photograph, eye-gated 2026-07-11.
Installer photograph, eye-gated 2026-07-11.
Specifications
Every value exactly as published in the official EF BD-5.1-S1 documentation.
Documents
Complete the system
Balance-of-system and accessories paired with this model. Every pairing follows the manufacturer's official compatibility list.
EF BD-5.1-S1 5.1 kWh LFP battery pack
EF BD-B-S1 battery stack base unit
EF BD-JC-S1 junction pack
- [1]EF BD-5.1-S1 5.1 kWh LFP battery pack
- [2]EF BD-B-S1 battery stack base unit
- [3]EF BD-JC-S1 junction pack
What this unit is approved to run with.
Every pairing below traces to a manufacturer compatibility list, by document version and date. A pairing only one maker lists is marked; we quote it, an engineer confirms it.
EcoFlow EF HD-P1-3.68K-S1
Item no. DLK-ECOFLOW-EFHDP1368KS1 On EcoFlow's compatibility list
EcoFlow EF HD-P1-3K-S1
Item no. DLK-ECOFLOW-EFHDP13KS1 On EcoFlow's compatibility list
EcoFlow EF HD-P1-4.6K-S1
Item no. DLK-ECOFLOW-EFHDP146KS1 On EcoFlow's compatibility list
EcoFlow EF HD-P1-5K-S1
Item no. DLK-ECOFLOW-EFHDP15KS1 On EcoFlow's compatibility list
EcoFlow EF HD-P1-6K-S1
Item no. DLK-ECOFLOW-EFHDP16KS1 On EcoFlow's compatibility list
EcoFlow EF HD-P3-10K-S1
Item no. DLK-ECOFLOW-EFHDP310KS1 On EcoFlow's compatibility list
EcoFlow EF HD-P3-12K-S1
Item no. DLK-ECOFLOW-EFHDP312KS1 On EcoFlow's compatibility list
EcoFlow EF HD-P3-6K0-S1
Item no. DLK-ECOFLOW-EFHDP36K0S1 On EcoFlow's compatibility list
Pick the rating
EcoFlow PowerOcean family. Same engineering, different size.
Every figure comes straight from the manufacturer's official datasheet.
Configuration 3
Capacity builds in 5.1 kWh steps of the EF BD-5.1-S1, up to three packs per stack.
- Stack table: 1 / 2 / 3 packs give 5.1 / 10.2 / 15.3 kWh nominal and 4.8 / 9.7 / 14.5 kWh usable at 95% depth of discharge.
- Single-phase: the HD-P1 inverters (3 to 6 kW) take up to 15.3 kWh each, cascadable to about 45 kWh across three HD-P1 units.
- Three-phase: a single HD-P3 inverter (6 to 12 kW) takes up to 45.9 kWh, which is 9 packs (45.9 / 5.1, simple arithmetic).
- Voltage class: 800 V nominal, 720 to 960 V operating window.
Every stack is built on dedicated EcoFlow structural hardware; the packs alone are not a complete stack.
- Single-phase (HD-P1): one EF BD-B-S1 battery base per stack, whatever the pack count.
- Three-phase (HD-P3): the same base plus one EF BD-JC-S1 junction box per stack; EcoFlow lists the junction box in every three-phase configuration.
- Assembled size: with the base, a 1 / 2 / 3 pack stack measures 452 / 849 / 1245 mm high and weighs 59.2 / 114.7 / 170.2 kg on a 680 x 183 mm footprint.
EcoFlow rates each EF BD-5.1-S1 at 3300 W maximum output and 2500 W maximum charge input.
- Sizing rule: a three-pack stack can source 3 x 3300 W = 9.9 kW (simple arithmetic), so match pack count to the charge and discharge power of the 3 to 12 kW PowerOcean inverter you pair it with.
- Chemistry: LFP cells with 4.8 kWh usable per pack at 95% depth of discharge.
- Monitoring: the PowerOcean platform carries RS485, CAN, Wi-Fi, Bluetooth and 4G for direct EcoFlow app monitoring without extra gateway hardware.
Installation & wiring 1
Yes. The pack is IP65-rated and specified for -20 to 50 C, so it can sit outdoors or in an unheated plant room.
- Mounting: floor stand or wall mounting per EcoFlow's installation options.
- Noise: cooling is by natural convection with noise emission of 35 dB or less.
- Site limits: 0 to 100% relative humidity (condensing) and up to 3000 m altitude.
- Handling: 55.5 kg per pack at 680 x 183 x 424 mm; plan a two-person lift per pack.
Availability & compliance 1
EcoFlow lists CB and CE certification for the EF BD-5.1-S1, with protection built into the pack itself.
- Safety: EN 62619, EN 62040-1, EN 62477-1, ISO 13849 and VDE-AR-E 2510-50.
- EMC and transport: EN 61000-6-1 through -6-4; UN38.3 for delivery.
- Built-in protection: integrated active aerosol fire prevention module, protective class I, IP65 enclosure.
- Grid connection: grid-code certification sits with the PowerOcean inverter; confirm the certificate set for your grid operator with the quote.
Send the project. Hear from an engineer within 24 hours.
Loads, tariff, site constraints - our engineers reply with a compatibility check and a sizing recommendation.
Contact project supportOr write to linker01@de-linker.com — attach your load profile if you have one.