The EcoFlow Battery Junction Box and Floor Base for PowerOcean Plus (3ph) and Ocean 2 is a genuine EcoFlow accessory set designed for three-phase installations using either the PowerOcean Plus or Ocean 2 / Ocean 2 Plus hybrid inverter ranges. The junction box provides the electrical connection and safe disconnect/reconnect point between the inverter and battery stack, while the floor base secures the stack to the floor.
Maximum supported battery quantity depends on which system it is paired with: PowerOcean Plus (3ph) inverters support a stack of up to 4 batteries, while Ocean 2 and Ocean 2 Plus inverters support up to 6 batteries in a single stack. The battery modules feature LFP (LiFePO4) cell chemistry with a built-in fire prevention module and an IP65-rated enclosure.
3-Phase
System Compatibility
4 or 6
Max. Batteries (System Dependent)
IP65
Battery Ingress Protection
LFP
Battery Cell Chemistry
Please Note: Maximum battery stack size depends on the connected inverter: PowerOcean Plus (3ph) supports up to 4 batteries in a single stack, while Ocean 2 and Ocean 2 Plus support up to 6. Where PowerOcean 5kWh and Ocean 2 5kWh batteries are mixed in the same stack (connected to an Ocean 2 or Ocean 2 Plus inverter), the maximum combined stack size is 4 batteries, regardless of the inverter's normal 6-battery limit.
Key Features
Compatible with Two Inverter Ranges
Designed to work with both PowerOcean Plus (3ph) and Ocean 2 / Ocean 2 Plus three-phase hybrid inverters, simplifying stock for installers working across both ranges.
Battery-Inverter Connection Control
The junction box manages safe disconnect and reconnect of the battery stack from the inverter, supporting safe maintenance and servicing.
Cross-Generation Battery Compatibility
Supports mixed stacking of PowerOcean 5kWh and Ocean 2 5kWh batteries when connected to an Ocean 2 or Ocean 2 Plus inverter, within the stated stacking limits.
Scalable to 6 Batteries (Ocean 2 / Plus)
When paired with an Ocean 2 or Ocean 2 Plus inverter, the base and junction box support a stack of up to 6 battery modules.
LFP Battery Safety Technology
Compatible with EcoFlow's LFP battery modules, which include a built-in fire prevention module as part of a layered safety design.
Secure Floor-Standing Fixing
The floor base is bolted directly to the floor, providing a stable, level foundation for the full battery stack and junction box assembly.
Battery Quantity by System
Connected Inverter
Max. Batteries per Stack
Notes
PowerOcean Plus (3ph)
4
Single battery generation only
Ocean 2 / Ocean 2 Plus (3ph)
6
Single battery generation (Ocean 2 or PowerOcean, not mixed)
Ocean 2 / Ocean 2 Plus (3ph) — mixed batteries
4
Applies when combining PowerOcean 5kWh and Ocean 2 5kWh batteries in one stack
Technical Specifications
General
Product Type
Battery Junction Box & Floor Base (Floor Stand)
Compatible Systems
EcoFlow PowerOcean Plus (3ph), Ocean 2 (3ph), Ocean 2 Plus (3ph)
Compatible Batteries
EcoFlow PowerOcean LFP Battery, EcoFlow Ocean 2 LFP Battery 5.02kWh
Capacity
Max. Batteries — PowerOcean Plus (3ph)
4
Max. Batteries — Ocean 2 / Ocean 2 Plus (3ph)
6
Max. Batteries — Mixed Generations
4 (when combining PowerOcean and Ocean 2 batteries)
Installation
Mounting Method
Floor standing, fixed with expansion bolts
Minimum Side Clearance
300 mm either side of the stack
Cascading Clearance
400 mm minimum between adjacent battery stacks (4+ battery packs)
Related Battery Modules
Cell Chemistry
LiFePO4 (LFP)
Important Safety Information: All electrical connections to the junction box must be carried out by a professionally trained and certified electrician. Confirm the connected inverter model and battery generation before finalising the stack size, and do not exceed the maximum battery count applicable to your specific configuration.
Frequently Asked Questions
How many batteries can I stack with this junction box and base?
It depends on the connected inverter: PowerOcean Plus (3ph) supports up to 4 batteries, while Ocean 2 and Ocean 2 Plus support up to 6. If mixing PowerOcean and Ocean 2 batteries in the same stack, the limit is 4 batteries regardless of inverter.
Can I mix PowerOcean and Ocean 2 batteries in the same stack?
Yes, when connected to an Ocean 2 or Ocean 2 Plus inverter, PowerOcean 5kWh and Ocean 2 5kWh batteries are cross-compatible. However, mixed stacks are limited to a maximum of 4 batteries total.
Is this the same accessory as the standard 3ph PowerOcean base?
No. This junction box and floor base is designed for PowerOcean Plus (3ph) and Ocean 2 / Ocean 2 Plus systems. The original 3ph PowerOcean system uses a separate junction box and base rated for a maximum of 4 batteries only.
What does the junction box do?
The junction box provides the electrical connection point between the inverter and battery stack, and manages safe disconnect and reconnect of the batteries for maintenance purposes.
Does this require professional installation?
Yes. All electrical connections must be made by a professionally trained and certified electrician, in accordance with the manufacturer's installation guide for the specific inverter and battery combination.
