ecoflow-comprehensive-guide
EcoFlow LFP Battery Adapter & Termination
This guide covers the teardown and pinout exploration of the EcoFlow LFP Battery Adapter and the proprietary communication protocols used to activate the battery.
🔌 LFP Battery Adapter Overview
The EcoFlow LFP Battery Adapter is used to connect Delta Pro Extra Batteries (LFP) to third-party 48V/60V inverters or the EcoFlow Power Kits.
Official diagram showing RJ45 ports, power studs, and the LFP female battery port.
Activation logic
Normally, the battery terminal is “dead” (0V) until a handshake is performed via the communication pins.
According to community measurements and teardowns:
- Pins 4 and 5 on the communication interface are internally shorted within the adapter.
- By shorting Pin 4 and Pin 5, the BMS (Battery Management System) activates the main MOSFETs.
- Once pins 4 and 5 are bridged, the main terminals will output nominal voltage (approx. 51.2V - 58V depending on SoC).
[!WARNING] DANGER: Always use a fuse when bypassing safety checks. Shorting wrong pins can permanently damage the BMS or cause a fire.
đź› Technical Pinout & Wiring
The adapter serves as a bridge between the battery’s proprietary signal interface and standard RJ45 CAN Bus ports.
Signal Connector (8-Pin)
Orientation: Tab at the top, pins numbered right to left (1 to 8).
| Pin | Mapping | Function |
|---|---|---|
| 1 | RJ45 Pins 1 | CAN Data Pair (See Terminator) |
| 2 | RJ45 Pins 2 | CAN Data Pair (See Terminator) |
| 3 | RJ45 Pins 7 | Signal / Ground ? |
| 4 | RJ45 Pins 4 | Bridge to Pin 5 (Activate Battery) |
| 5 | RJ45 Pins 4 | Bridge to Pin 4 (Activate Battery) |
| 6 | N/C | Not Connected |
| 7 | N/C | Not Connected |
| 8 | RJ45 Pins 5 & 8 | Signal / Ground ? |
RJ45 CAN Bus Ports
The adapter features two parallel RJ45 ports. These are used for daisy-chaining multiple batteries or connecting to the EcoFlow Power Kit Console/Wireless Dongle.
Internal Wiring (Adapter to RJ45):
- Adapter Pin 1 → RJ45 Port 1 (Pin 1) & RJ45 Port 2 (Pin 1)
- Adapter Pin 2 → RJ45 Port 1 (Pin 2) & RJ45 Port 2 (Pin 2)
- Adapter Pin 3 → RJ45 Port 1 (Pin 7) & RJ45 Port 2 (Pin 7)
- Adapter Pin 4 & 5 (Shorted) → RJ45 Port 1 (Pin 4) & RJ45 Port 2 (Pin 4)
- Adapter Pin 8 → RJ45 Port 1 (Pins 5 & 8) & RJ45 Port 2 (Pins 5 & 8)
🔌 CAN Bus Terminator
When bypassing the official ecosystem or daisy-chaining batteries, a terminator is required on any unused RJ45 port to prevent signal reflection.
Specifications:
- Resistor: 120 Ohm.
- Connection: Bridged between Pin 1 and Pin 2 of the RJ45 plug.
[!NOTE] Official EcoFlow documentation states: “When two or more battery packs are connected and the RJ45 CAN Bus port is not connected… a terminator MUST be connected to ensure proper communication.”
Official schematic for parallel connection of multiple batteries. Notice how the RJ45 chain forms a unified CAN bus across all units.
Manual Analysis:
- Daisy Chaining: The two RJ45 ports are strictly for CAN Bus continuity. Each battery in a parallel stack must “see” the same communication bus.
- Terminal Isolation: The diagram confirms that even in parallel, the communication bus is critical for the “Master” (or the console) to manage the state of charge across all packs.
Internal Photos & Assembly
The adapter is held together by screws on the underside of the housing.
The housing uses several screws.
đź’ˇ DIY Implementation
If you don’t have the official adapter, you can use a custom jumper on the 8-pin connector (Shorting 4 and 5) to wake up the battery for use with generic 48V systems.
Voltage Check: With pins 4 and 5 shorted, verify the voltage on the main terminals:
- Nominal: ~51.2V (LFP 16S)
- Full Charge: ~58.4V
đź› Hardware Tips for DIY Cables
- Power Connectors: Observations show that the high-power terminals inside the proprietary battery port are physically compatible with standard MC4 (Solar) connector pins.
- Compatibility: The larger internal sockets in the terminal appear to match the metal inserts used in MC4 connectors.
[!CAUTION] CURRENT LIMITATIONS: While MC4 pins may fit physically, the original EcoFlow adapter terminals are designed for significantly higher currents (often 50A-80A continuous). Standard MC4 pins are typically rated for 20A-30A.
If you use MC4 pins for a DIY cable:
- Monitor temperatures closely during high-load charging/discharging.
- Understand the power limits of your specific connector.
- Risk of melting: Drawing 80A through a 30A-rated pin will lead to overheating, melting of the connector, and potential fire.
Only use this method for low-power applications or under strictly controlled conditions.