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EcoFlow•Delta Pro

Analysis by Marcus & Team

EcoFlow Delta Pro Battery Communication Error

Troubleshoot EcoFlow Delta Pro communication loss with extra battery. Diagnose communication faults & restore reliable backup power. Safe, expert guidance.

Frequently Asked Questions

•How do I check the firmware version of my EcoFlow Delta Pro and extra battery?

Open the EcoFlow app, select your Delta Pro, and navigate to the 'Settings' menu. The firmware versions for both the Delta Pro and the connected extra battery will be displayed there. Check for available updates.

•What is the expected voltage range for the CAN bus connector pins?

Refer to the EcoFlow Delta Pro service manual for the specific pinout and voltage ranges. Generally, the CAN High pin should be around 2.5V - 3.5V, and the CAN Low pin should be around 1.5V - 2.5V when the system is active.

•Where is the DC disconnect switch located on the EcoFlow Delta Pro?

The DC disconnect switch is typically located on the rear of the EcoFlow Delta Pro unit, near the battery connection ports. Consult your product manual for the exact location and operation.

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Marcus leads the technical research department at Storage Faults. Together with a team of systems analysts, he specializes in translating complex solar storage error codes into actionable diagnostic steps for the US market.

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Pro Tip:

Try a "hard reset" of the Delta Pro. With the unit powered off, simultaneously press and hold the AC power button, DC power button, and the IoT reset button for 10 seconds. This can sometimes clear corrupted communication settings. Then power cycle the unit and re-establish connection with the extra battery.

Why This Happens:

Faulty CAN bus communication cable between the Delta Pro and the extra battery.
Loose or corroded connectors on the CAN bus cable or at the Delta Pro/extra battery communication ports.
Firmware incompatibility or corruption within the Delta Pro or the extra battery BMS.
Overheating of the extra battery, leading to temporary BMS shutdown and communication loss.
Internal failure within the Delta Pro's communication module.
Damage to the extra battery's BMS, preventing it from transmitting data.

Technical Overview:

The EcoFlow Delta Pro and its extra battery communicate via a CAN bus protocol to manage charging/discharging parameters and provide real-time SOC/SOH data. The BMS within the Delta Pro monitors cell voltages, temperature, and current of both the main unit and extra battery. The communication link is essential for safe and efficient operation, ensuring cell balancing and preventing overcharge/over-discharge scenarios. Failure of this communication link isolates the extra battery from the main unit's control, potentially leading to operational inefficiencies and safety risks.

Symptoms:

EcoFlow Delta Pro displays a communication loss error with the connected extra battery. The extra battery may not be charging or discharging, and its SOC is not reflected accurately in the EcoFlow app. No error codes displayed on the Delta Pro screen besides the communication loss indicator.

Safety Warning:

The EcoFlow Delta Pro and its extra battery operate at high DC voltages. Always disconnect the system using the DC disconnect switch before performing any maintenance or troubleshooting. Never work on live circuits. Improper handling can result in electric shock, arc flash, or thermal runaway, potentially causing serious injury or death. Qualified electricians familiar with ESS systems and NEC Article 706 are required for advanced troubleshooting and repairs. Ensure compliance with NEC 690.15 for rapid shutdown if applicable.

Solution:

1

Power down the EcoFlow Delta Pro and disconnect the extra battery using the DC disconnect switch.
2

Inspect the CAN bus communication cable for any visible damage (cuts, kinks, or frayed wires). Replace the cable if any damage is found.
3

Check the connectors on both ends of the CAN bus cable for corrosion or loose connections. Clean the connectors with a contact cleaner (following manufacturer's instructions and safety precautions).
4

Reconnect the extra battery and power on the Delta Pro. Monitor the EcoFlow app to see if the communication is restored. If not, proceed to step 5.
5

Check the firmware version of both the Delta Pro and the extra battery via the EcoFlow app. Update to the latest firmware version if available (ensure both devices are adequately charged before initiating the update).
6

If the communication error persists, use a multimeter to check the voltage levels on the CAN bus connector pins on both the Delta Pro and the extra battery, referring to the EcoFlow service manual for pinout and expected voltage ranges. Deviations from the expected values indicate a hardware fault. NEC Article 706 regarding energy storage systems should be consulted.
7

Contact EcoFlow support for further assistance, as internal component failure may require licensed technician repair or replacement.

Maintenance Tips:

Regularly inspect the CAN bus communication cable for any signs of damage or wear.
Keep the connectors clean and free from corrosion.
Ensure that both the Delta Pro and the extra battery are running the latest firmware versions.
Avoid exposing the extra battery to extreme temperatures.
Periodically check the SOC of the extra battery to ensure it is charging/discharging as expected. Perform capacity testing annually using the EcoFlow app.