SPH 3000–6000TL BL-UP / SPH 4000–10000TL3 BH-UP hybrid (Error 2xx–6xx codes)
Growatt Error 503 error code
Battery voltage is above the inverter's high battery-voltage limit. The same condition appears as the 'Bat Voltage High' warning before it trips.
Likely causes
- Charge voltage setpoint too high for the battery
- Wrong battery type selected (lead-acid profile on a lithium battery)
- BMS communication absent so the inverter charges blind
- Battery bank not matched to the inverter's battery voltage range
Checks to run, in order
- 1Measure battery voltage at the inverter battery terminals
- 2Compare with the battery manufacturer's maximum charge voltage
- 3Check the battery type and charge voltage settings in the inverter
- 4Check whether BMS communication is live (Error 500/BMS alarms present)
Fixes
- Lower the charge voltage to the battery manufacturer's specification
- Select the correct battery type or lithium protocol
- Restore BMS communication so the inverter follows the BMS charge limits
When to escalate
If the measured battery voltage is within the specified range and Error 503 persists, ask Growatt support to check the battery-voltage sensing.
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 503 mean?
Battery voltage is above the inverter's high battery-voltage limit. The same condition appears as the 'Bat Voltage High' warning before it trips.
How do I fix Growatt Error 503?
Lower the charge voltage to the battery manufacturer's specification Select the correct battery type or lithium protocol Restore BMS communication so the inverter follows the BMS charge limits
When should I escalate Growatt Error 503?
If the measured battery voltage is within the specified range and Error 503 persists, ask Growatt support to check the battery-voltage sensing.
Can I reset Growatt Error 503 myself?
Only after isolating the AC and DC sides and running the checks above. If Growatt Error 503 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 503?
Growatt Error 503 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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