SPH 3000–6000TL BL-UP / SPH 4000–10000TL3 BH-UP hybrid (Error 2xx–6xx codes)
Growatt Error 300 error code
Grid voltage is outside the inverter's configured grid-voltage window. The three-phase BH-UP manual shows variants AC V Outrange (1), (2) and (3) with the same checks.
Likely causes
- Grid voltage genuinely high or low from the utility
- Generator supply with unstable or out-of-window voltage
- AC cable too thin or too long, causing voltage rise on export or drop on load
- Loose AC terminal or worn breaker
- Grid protection settings not matched to the local supply
Checks to run, in order
- 1Measure AC voltage at the inverter AC input terminals with a true-RMS meter
- 2Compare the reading with the local grid standard and the grid settings in the inverter
- 3Inspect the AC breaker, terminals and cable sizing for looseness or volt drop
- 4Note whether the fault appears only at high PV export or at heavy load
Fixes
- Correct loose AC wiring and re-torque the AC terminals
- Have the utility or generator supply corrected before retrying
- Adjust grid protection settings only within the local standard and Growatt limits
When to escalate
If the measured grid voltage is inside the permissible range and Error 300 persists, ask Growatt support to review the grid-sense board and grid settings.
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 300 mean?
Grid voltage is outside the inverter's configured grid-voltage window. The three-phase BH-UP manual shows variants AC V Outrange (1), (2) and (3) with the same checks.
How do I fix Growatt Error 300?
Correct loose AC wiring and re-torque the AC terminals Have the utility or generator supply corrected before retrying Adjust grid protection settings only within the local standard and Growatt limits
When should I escalate Growatt Error 300?
If the measured grid voltage is inside the permissible range and Error 300 persists, ask Growatt support to review the grid-sense board and grid settings.
Can I reset Growatt Error 300 myself?
Only after isolating the AC and DC sides and running the checks above. If Growatt Error 300 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 300?
Growatt Error 300 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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