Description
Scaling to 45.9 kWh with unified inverter power delivery.
EcoFlow EF BD-JC-S1 is a high-voltage DC junction combiner box engineered to aggregate up to 3 separate PowerOcean battery columns (up to 9 packs / 45.9 kWh total) into a single streamlined DC bus for EcoFlow HD-P3 three-phase hybrid inverters.
Enables Multi-Column Parallel Scaling (Up to 45.9 kWh)
Combines up to 3 separate battery towers (9 x 5.1 kWh packs) to build massive residential storage banks.
Unified High-Voltage Inverter DC Interface
Consolidates power and CAN communication lines into a single, clean connection to the HD-P3 inverter.
Integrated Tower-Level Safety Isolation
Built-in circuit protection allows isolating individual battery columns for maintenance without taking the entire system down.
Seamless IP65 Weatherproof Housing
Matches the exact width, aesthetic, and environmental sealing of the PowerOcean family for clean garage or outdoor pad mounting.
More product details
Sizing large residential storage requires multi-tower configurations. The EF BD-JC-S1 combines the DC outputs of up to 3 separate columns into a single high-voltage bus.
- Consolidates DC power and CAN communication lines into a single terminal set for the inverter.
- Internal pre-wired busbars handle continuous high-voltage current flow with minimal resistance.
- Ensures synchronized charging and discharging across all 9 battery modules.
EcoFlow PowerOcean
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Clean architectural integration with individual column isolation.
Designed to mount cleanly beside or between battery towers, the junction box maintains the aesthetic elegance of the PowerOcean product line. Matches the 680 mm width and depth of PowerOcean battery packs for aligned wall placement. Built-in DC disconnect switches allow isolating individual towers for maintenance. IP65 rated enclosure certified for unheated basements, technical utility rooms, and sheltered outdoor alcoves (-25 to +60 °C).
Holds the same energy steps
Capacity still comes from the packs. 1 / 2 / 3 packs stay 5.1 / 10.2 / 15.3 kWh nominal with this box fitted.
Keeps the 680 mm footprint
Width and depth stay 680 x 183 mm. Height is the number that moves. IP65, minus 20 to 50 C.
Sits on the EF BD-B-S1
The junction does not replace the base. Three-phase BOM is packs plus base plus this box.
Technical data
BMS aggregation and high-voltage DC combining engineered for three-phase PowerOcean systems.
High-voltage junction combiner enabling multi-tower scaling up to 45.9 kWh.
Designed exclusively for EcoFlow three-phase PowerOcean hybrid systems (HD-P3 series), the EF BD-JC-S1 junction box aggregates up to 3 separate battery columns (up to 9 total modules). It combines high-voltage DC power and communication pathways into a single feed to the inverter, unlocking massive 45.9 kWh energy storage for large electrified residences.
- Multi-Column Hub
- 3 Towers
- Maximum Storage
- 45.9 kWh
- Inverter Port
- Single Link
- All-Weather Build
- IP65
Battery / Storage
- 1 pack
- EF BD-JC-S1 x 1 + EF BD-5.1-S1 x 1 + EF BD-B-S1 x 1 -> 5.1 kWh nominal
- 2 packs
- EF BD-JC-S1 x 1 + EF BD-5.1-S1 x 2 + EF BD-B-S1 x 1 -> 10.2 kWh nominal
- 3 packs
- EF BD-JC-S1 x 1 + EF BD-5.1-S1 x 3 + EF BD-B-S1 x 1 -> 15.3 kWh nominal
- 1 pack, W x D x H (mm)
- 680 x 183 x 612 (+/-1)
- 1 pack, weight (kg)
- 65.6
- 2 packs, W x D x H (mm)
- 680 x 183 x 1009 (+/-1)
- 2 packs, weight (kg)
- 120.9
- 3 packs, W x D x H (mm)
- 680 x 183 x 1406 (+/-1)
- 3 packs, weight (kg)
- 176.2
Physical & Environmental
- 1 pack, W x D x H (mm)
- 680 x 183 x 612 (+/-1)
- 1 pack, weight (kg)
- 65.6
- 2 packs, W x D x H (mm)
- 680 x 183 x 1009 (+/-1)
- 2 packs, weight (kg)
- 120.9
- 3 packs, W x D x H (mm)
- 680 x 183 x 1406 (+/-1)
- 3 packs, weight (kg)
- 176.2
- Installation
- Floor stand
- Protection level
- IP65
- Operating temperature (C)
- -20 to 50
Project fit
Where this model fits.
Scenarios that show which projects the EcoFlow EF BD-JC-S1 belongs in, what to verify before quoting, and when another model is the better pick.
Large Electrified Homes & Small Commercial Sites Requiring >15 kWh Storage
Three-phase residences or small commercial sites installing 2 or 3 PowerOcean battery towers (20.4 to 45.9 kWh total).
Mandatory hardware unit required whenever connecting 2 or 3 battery columns to an HD-P3 three-phase hybrid inverter.
- Confirm this model against the adjacent rating in the same family
Documents
EcoFlow PowerOcean Three-phase datasheet (EU, EN) EcoFlow PowerOcean Three-Phase Datasheet (EN)Product questions
Can the EF BD-JC-S1 be used with single-phase PowerOcean inverters (HD-P1)?
No. Exclusively engineered for HD-P3 three-phase inverters. The junction box and its multi-tower communication protocols are supported exclusively on EcoFlow HD-P3 three-phase hybrid inverters (6 kW to 12 kW). Single-phase HD-P1 inverters support a single column (up to 15.3 kWh).
System components
Recommended components
EF BD-5.1-S1 5.1 kWh LFP battery pack
Item number: DLK-ECOFLOW-EFBD51S1
The building-block pack for every PowerOcean stack, single- or three-phase; both HD-P1 and HD-P3 systems scale storage in 5.1 kWh steps of this same pack.
EF BD-B-S1 battery stack base unit
Item number: DLK-ECOFLOW-EFBDBS1
EcoFlow's own stack table lists EF BD-B-S1 x1 in every single-phase configuration (with EF HD-P1), the base unit any HD-P1 battery stack is built on.
EF BD-JC-S1 junction pack
Item number: DLK-ECOFLOW-EFBDJCS1
EcoFlow's own stack table lists EF BD-JC-S1 x1 in every three-phase configuration (with EF HD-P3), the junction pack any HD-P3 battery stack is built on.
Approved pairings
EcoFlow EF HD-P1-3.68K-S1Item number DLK-ECOFLOW-EFHDP1368KS1Single-phase: EF BD-5.1-S1 x N plus one EF BD-B-S1 base. Three-phase: the same, plus one EF BD-JC-S1 junction pack, which the single-phase system does not use. Order the JC pack with every three-phase system. Max 45 kWh single-phase, 45.9 kWh three-phase.
EcoFlow EF HD-P1-3K-S1Item number DLK-ECOFLOW-EFHDP13KS1Single-phase: EF BD-5.1-S1 x N plus one EF BD-B-S1 base. Three-phase: the same, plus one EF BD-JC-S1 junction pack, which the single-phase system does not use. Order the JC pack with every three-phase system. Max 45 kWh single-phase, 45.9 kWh three-phase.
EcoFlow EF HD-P1-4.6K-S1Item number DLK-ECOFLOW-EFHDP146KS1Single-phase: EF BD-5.1-S1 x N plus one EF BD-B-S1 base. Three-phase: the same, plus one EF BD-JC-S1 junction pack, which the single-phase system does not use. Order the JC pack with every three-phase system. Max 45 kWh single-phase, 45.9 kWh three-phase.
EcoFlow EF HD-P1-5K-S1Item number DLK-ECOFLOW-EFHDP15KS1Single-phase: EF BD-5.1-S1 x N plus one EF BD-B-S1 base. Three-phase: the same, plus one EF BD-JC-S1 junction pack, which the single-phase system does not use. Order the JC pack with every three-phase system. Max 45 kWh single-phase, 45.9 kWh three-phase.
EcoFlow EF HD-P1-6K-S1Item number DLK-ECOFLOW-EFHDP16KS1Single-phase: EF BD-5.1-S1 x N plus one EF BD-B-S1 base. Three-phase: the same, plus one EF BD-JC-S1 junction pack, which the single-phase system does not use. Order the JC pack with every three-phase system. Max 45 kWh single-phase, 45.9 kWh three-phase.
EcoFlow EF HD-P3-10K-S1Item number DLK-ECOFLOW-EFHDP310KS1Single-phase: EF BD-5.1-S1 x N plus one EF BD-B-S1 base. Three-phase: the same, plus one EF BD-JC-S1 junction pack, which the single-phase system does not use. Order the JC pack with every three-phase system. Max 45 kWh single-phase, 45.9 kWh three-phase.
EcoFlow EF HD-P3-12K-S1Item number DLK-ECOFLOW-EFHDP312KS1Single-phase: EF BD-5.1-S1 x N plus one EF BD-B-S1 base. Three-phase: the same, plus one EF BD-JC-S1 junction pack, which the single-phase system does not use. Order the JC pack with every three-phase system. Max 45 kWh single-phase, 45.9 kWh three-phase.
EcoFlow EF HD-P3-6K0-S1Item number DLK-ECOFLOW-EFHDP36K0S1Single-phase: EF BD-5.1-S1 x N plus one EF BD-B-S1 base. Three-phase: the same, plus one EF BD-JC-S1 junction pack, which the single-phase system does not use. Order the JC pack with every three-phase system. Max 45 kWh single-phase, 45.9 kWh three-phase.
EcoFlow EF HD-P3-8K0-S1Item number DLK-ECOFLOW-EFHDP38K0S1Single-phase: EF BD-5.1-S1 x N plus one EF BD-B-S1 base. Three-phase: the same, plus one EF BD-JC-S1 junction pack, which the single-phase system does not use. Order the JC pack with every three-phase system. Max 45 kWh single-phase, 45.9 kWh three-phase.