ErrorFindly
F10High SeverityCross-brand compatible

Deye SUN-5K-SG03LP1 F10 – Meaning & Fix

Battery communication failure – the inverter cannot communicate with the battery management system.

Expert Verified

Reviewed by a Certified Electrical Engineer & Licensed Technician

Official Meaning

The CAN/RS485 communication link between the inverter and the lithium battery BMS has timed out or is returning invalid data.

Real-World Causes

  • 1Loose or damaged communication cable between inverter and battery BMS
  • 2Incorrect battery protocol selected in inverter settings
  • 3BMS firmware incompatibility with the inverter firmware version
  • 4Communication cable pinout does not match the battery manufacturer's specification
  • 5Electromagnetic interference from nearby high-power equipment

Symptoms

Look for these signs to confirm F10 on your Deye SUN-5K-SG03LP1:

  • F10 fault code displayed on the inverter screen
  • Battery SOC shows 0% or dashes on the display
  • Inverter refuses to charge or discharge the battery
  • System operates in grid-only mode ignoring the battery
  • Intermittent battery operation – works sometimes, fails other times

DIY Fix (Safe)

  1. 1Check the communication cable between the inverter and battery – reseat both ends firmly
  2. 2Verify the correct battery protocol is selected: Settings > Battery > Battery Type
  3. 3Power cycle both the inverter and battery BMS by disconnecting all power for 2 minutes
  4. 4Inspect the communication cable for damage, kinks, or crushed sections
  5. 5If using a custom cable, verify the pinout matches both the inverter and battery documentation

Professional Action Required

  1. 1Use an oscilloscope or CAN bus analyzer to verify communication signals on the cable
  2. 2Update both inverter and battery BMS firmware to the latest compatible versions
  3. 3Replace the communication cable with a shielded twisted pair cable to reduce interference
  4. 4Contact the battery manufacturer to confirm protocol compatibility with the Deye inverter
  5. 5If CAN bus termination is required, install a 120-ohm termination resistor at the end of the bus

Contextual Information

Weather Conditions
Any – communication faults are not weather-dependent
Grid Status
Occurs regardless of grid status
Battery / Load
Battery cannot be used until communication is restored

Frequently Asked Questions

Which battery protocol should I select for my lithium battery?
Common settings: Lithium (CAN) for most branded batteries, or check your battery manufacturer's compatibility list. Popular choices include BYD, Pylontech, and Hubble protocols.
Can I use lead-acid batteries to avoid communication issues?
Yes, lead-acid batteries do not require CAN communication and will bypass F10 entirely. However, you lose features like accurate SOC tracking and temperature-based charging.

Cross-Brand Compatibility

This error code applies to identical hardware sold under different brands:

  • Sunsynk ECCO 5kW— Uses identical Deye hardware – same error codes and fixes apply

Related Error Codes

F06—Deye SUN-5K-SG03LP1
Medium Severity

About the Author

Technical Review Team

Reviewed by certified electrical engineers and licensed appliance technicians with 10+ years of field experience. Our team verifies every error code explanation against manufacturer documentation and real-world repair data.