What does Growatt error 03 mean?
03 means the battery voltage went above the limit. Usually the battery type or charging setting is wrong, or the number and voltage of batteries don't suit the inverter.
Why does code 03 appear?
- The wrong battery type (lithium or lead-acid) is set.
- The charging voltage setting is too high.
- The number or voltage of batteries doesn't match the inverter.
What can you safely check for 03?
- Switch the inverter off, wait 5 minutes and switch it on again.
- Think back: was the battery changed or a setting touched recently? If so, tell the installer.
Safety: never reach into an electrical panel, board, gas pipe or the inside of an inverter yourself. You can get a shock or release gas. This is a mistri's job.
When should you call a mistri?
If 03 returns, call a solar mistri. Measuring battery voltage and fixing the settings is their job; otherwise the battery can swell or get damaged. An inverter carries DC current from the panels and battery that can kill, even after the mains is off. Never open the inverter cover or the DC wires yourself.