SPH 3000–6000TL BL-UP / SPH 4000–10000TL3 BH-UP hybrid (Error 2xx–6xx codes)
Growatt Error 502 error code
Battery voltage is below the inverter's low battery-voltage limit.
Likely causes
- Battery discharged below the low-voltage cutoff
- No charging from PV or grid (charge disabled or charge source failed)
- Battery breaker or fuse open
- BMS low-voltage protection has opened the battery
- Battery bank undersized for the overnight load
Checks to run, in order
- 1Measure battery voltage at the inverter battery terminals
- 2Check the battery SOC on the BMS or inverter display
- 3Confirm PV and grid charging are enabled and actually delivering current
- 4Check the battery breaker and fuse
Fixes
- Recharge the battery from grid or PV and confirm charge current
- Close the battery breaker or replace the fuse
- Reduce the overnight load or add battery capacity if the bank is undersized
When to escalate
If the measured battery voltage is within the specified range and Error 502 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 502 mean?
Battery voltage is below the inverter's low battery-voltage limit.
How do I fix Growatt Error 502?
Recharge the battery from grid or PV and confirm charge current Close the battery breaker or replace the fuse Reduce the overnight load or add battery capacity if the bank is undersized
When should I escalate Growatt Error 502?
If the measured battery voltage is within the specified range and Error 502 persists, ask Growatt support to check the battery-voltage sensing.
Can I reset Growatt Error 502 myself?
Only after isolating the AC and DC sides and running the checks above. If Growatt Error 502 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 502?
Growatt Error 502 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.
Back to troubleshooting