EcoFlow EF BD-JC-S1
EcoFlow PowerOcean EF BD-JC-S1 is the battery junction box of the three-phase PowerOcean stack.
- 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.
- Manufacturer
- EcoFlow
- Model code
- PowerOcean Battery Junction Box
- Item no.
- DLK-ECOFLOW-EFBDJCS1
- Delivery
- Delivery included in your Proforma
Plan with PowerOcean Battery Junction Box
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
Size it to the load. Grow it later.
Modular stacks scale with the project instead of forcing a day-one guess.
Role
One EF BD-JC-S1 per three-phase PowerOcean battery stack. Not used on single-phase stacks.
Inspect it before you spec it.
Official renders, installation photos and system panels for this model line.
PowerOcean battery stack at a real installation (installer photo, cropped).
Manufacturer imagery from EcoFlow's official documentation.
EcoFlow PowerOcean single-phase hybrid inverter, official render
Installer photograph, eye-gated 2026-07-11.
Specifications
Every value exactly as published in the official PowerOcean Battery Junction Box 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 2
Only on three-phase PowerOcean systems. EcoFlow lists the EF BD-JC-S1 in every three-phase battery configuration and in none of the single-phase ones.
- Rule: one junction box per stack, on top of the standard one EF BD-B-S1 base; the pack count (1 to 3) does not change it.
- Single-phase: HD-P1 stacks need no junction box, only base plus packs.
- BOM check: a three-phase stack reads EF BD-JC-S1 x 1 + EF BD-5.1-S1 x 1 to 3 + EF BD-B-S1 x 1.
No. Capacity comes from the packs; EcoFlow's stack table shows the same energy figures with and without the junction box.
- Same steps: with the junction box fitted, 1 / 2 / 3 packs still give 5.1 / 10.2 / 15.3 kWh nominal.
- Scaling further: a single HD-P3 three-phase inverter takes up to 45.9 kWh of packs, so larger systems add further stacks, each with its own base and junction box.
- Ordering: quantities follow stack count, not pack count; one junction box per three-phase stack.
Installation & wiring 1
It adds about 160 mm of height and 6.0 to 6.4 kg over the base-only stack, depending on pack count (simple arithmetic on EcoFlow's stack figures); the footprint stays 680 x 183 mm.
- 1 pack: 680 x 183 x 612 mm, 65.6 kg.
- 2 packs: 680 x 183 x 1009 mm, 120.9 kg.
- 3 packs: 680 x 183 x 1406 mm, 176.2 kg.
- Mounting: EcoFlow specifies floor-stand installation for junction-box stacks, so plan a three-phase battery as a floor tower rather than a wall mount.
Availability & compliance 1
EcoFlow lists CE marking and the same safety standard set as the battery packs.
- Safety: EN 62619, EN 62040-1, EN 62477-1, ISO 13849, VDE-AR-E 2510-50.
- EMC and transport: EN 61000-6-1 through -6-4; UN38.3 for delivery.
- Environment: IP65 and -20 to 50 C, matching the packs and base, so the assembled tower carries one common rating.
- Grid connection: grid-code certification sits with the HD-P3 inverter; confirm the certificate set for your grid operator with the quote.
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Loads, tariff, site constraints - our engineers reply with a compatibility check and a sizing recommendation.
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