SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2
Deye F46 error code
On SG04LP3/SG05LP1, a backup-battery fault: parallel batteries have mismatched voltage, SOC or parameters; on SG01HP3-DM2 firmware F46 instead reports AC grid undervoltage.
Likely causes
- Parallel batteries at different voltage or SOC
- Mismatched battery parameters
- Weak grid voltage on SG01HP3
- Battery communication problem
Checks to run, in order
- 1Check each battery's voltage, SOC and parameters
- 2Check battery communication
- 3Measure the grid voltage on SG01HP3
Fixes
- Equalise battery voltage, SOC and parameters
- Correct the low grid voltage
- Restart the system
When to escalate
If the batteries are matched and F46 persists, the distributor should check the battery and BMS configuration.
Fix it with the right tools
Check the system around the fault before replacing parts: load, battery bank, PV string and commissioning settings. If you need a second opinion, send the code and your inverter model to our team.
Before you open the inverter
- Isolate both the AC and DC sides, then confirm the display is dead before touching terminals.
- Use insulated tools and one hand where possible. DC arcs do not self-extinguish like AC.
- If you see burnt terminals, swollen cells, leaking electrolyte or a burning smell, stop and escalate instead of resetting the fault.
Questions installers ask
What does Deye F46 mean?
On SG04LP3/SG05LP1, a backup-battery fault: parallel batteries have mismatched voltage, SOC or parameters; on SG01HP3-DM2 firmware F46 instead reports AC grid undervoltage.
How do I fix Deye F46?
Equalise battery voltage, SOC and parameters Correct the low grid voltage Restart the system
When should I escalate Deye F46?
If the batteries are matched and F46 persists, the distributor should check the battery and BMS configuration.
Can I reset Deye F46 myself?
Only after isolating the AC and DC sides and running the checks above. If Deye F46 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Deye F46?
Deye F46 is documented for SG04LP3/SG05LP1 hybrid families and SG01HP3-EU-DM2. Confirm the code on your own unit's display or manual before ordering parts.
More Deye error codes
- Deye F01PV input polarity is reversed at one or both DC inputs.
- Deye F02PV insulation resistance to earth is below the safety limit.
- Deye F03Ground fault detected on the PV array (GFDI).
- Deye F04GFDI ground-failure alarm: the PV array or inverter is not properly earthed.
- Deye F05Control-board EEPROM read failure.
- Deye F06Control-board EEPROM write failure.
Guidance reviewed 17 October 2026 by the Mishka Energy installer team. Error codes vary by brand, model family and firmware; confirm against the manufacturer manual.
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