No, the old data logger does not need to be deleted from the ShinePhone app (or server.growatt.com / OSS) when installing and registering the new one.
Why this works
Growatt data loggers are identified and registered by their unique serial number (SN) + check code. The app/server treats each logger SN independently. You can have multiple loggers listed under the same plant (common in multi-inverter setups, and also possible for sequential testing on one inverter).
- Physically unplug the old logger and plug in the new one.
- Add/register the new logger’s SN (via QR scan or manual entry) in the plant’s Data Logger List.
- Configure its Wi-Fi connection as normal.
- The old logger will simply appear offline (or remain listed) while the new one is active and online.
There is no requirement in the app or Growatt’s systems to delete the previous logger before adding a different one on the same plant/inverter.
Falling back to the old logger
Because the old logger’s registration remains in the account/plant:
- Unplug the new logger and plug the old one back in.
- Go to the plant → Data Logger List.
- Long-press (or select) the old logger entry and choose Configure datalogger (or the equivalent option).
- Re-enter/reconnect the Wi-Fi details if needed (Standard or Hotspot/AP mode).
It should come back online without having to re-add the SN from scratch. Historical data associated with that logger SN generally stays intact.
When you would delete the old logger
- You want a clean list with only the active logger.
- You are permanently replacing it and no longer need the old entry.
- You encounter a “Datalogger already exists” error for some other reason (usually because the SN is bound to a different account/plant — in that case Growatt support or the previous account holder must unbind it).
Deleting is optional for your fallback scenario and is done via long-press on the logger in the Data Logger List (app) or the equivalent delete option on the web portal.
Practical tips
- Note the old logger’s SN (and check code if visible) before swapping, just in case.
- Only one logger can be physically connected to the inverter’s USB/COM port at a time.
- Ensure the new logger is compatible with the inverter model.
- Use 2.4 GHz Wi-Fi only for configuration.
- If anything gets stuck (e.g., binding issues), Growatt support can release an SN quickly when given the serial number.
You can safely try the new logger while keeping the old registration intact, then swap back if needed.
