SPH 3000–6000TL BL-UP / SPH 4000–10000TL3 BH-UP hybrid (Error 2xx–6xx codes)
Growatt Error 505 error code
Battery polarity is reversed at the inverter battery input.
Likely causes
- Battery positive and negative cables swapped
- Reversed extension cable or wrongly labelled battery terminal
- Battery bank reconnected after maintenance with polarity reversed
Checks to run, in order
- 1Isolate the battery and measure polarity at the inverter battery terminals
- 2Inspect cable ends and lug labelling against the battery terminals
- 3Check whether a battery fuse or breaker has opened during the event
Fixes
- Correct the battery polarity and re-terminate the cables
- Replace any fuse that opened during the reverse connection
- Restart the inverter and verify battery voltage and charging
When to escalate
If polarity is correct and Error 505 persists, the battery input protection may be damaged — return the inverter to Growatt service.
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 Growatt Error 505 mean?
Battery polarity is reversed at the inverter battery input.
How do I fix Growatt Error 505?
Correct the battery polarity and re-terminate the cables Replace any fuse that opened during the reverse connection Restart the inverter and verify battery voltage and charging
When should I escalate Growatt Error 505?
If polarity is correct and Error 505 persists, the battery input protection may be damaged — return the inverter to Growatt service.
Can I reset Growatt Error 505 myself?
Only after isolating the AC and DC sides and running the checks above. If Growatt Error 505 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Growatt Error 505?
Growatt Error 505 is documented for SPH 3000–6000TL BL-UP / SPH 4000–10000TL3 BH-UP hybrid (Error 2xx–6xx codes). Confirm the code on your own unit's display or manual before ordering parts.
More Growatt error codes
- Growatt 01Fan is locked (displayed as F01 on the SPF ES Lite).
- Growatt 02Internal component temperature is over 100 °C (F02 on the ES Lite).
- Growatt 03Battery is over-charged / battery voltage is too high (F03 on the ES Lite).
- Growatt 04Battery voltage low.
- Growatt 05Output is short-circuited (F05 on the ES Lite).
- Growatt 06Output voltage is too high. The manual groups 06/58 as 'output abnormal' — inverter voltage above 150 Vac or below 40 Vac.
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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