The short answer
Likely CT polarity: check phases in the graph and reverse CT polarity in the portal if needed.
Plain explanation
From the Enphase manual for the IQ Gateway + CTs: Check CT polarity (Graph > Show phases). Check load type. The rest of the checklist is below; work through it in order. Installer only: DC and AC work on a live PV system is dangerous, so owners should note the code and call their installer.
Steps from the source
- Check CT polarity (Graph > Show phases)
- Check load type
- Installer reverses CT polarity in portal
- Change meter start date
Source
Enphase Solar Troubleshooting Guide ING-00061-2.0 (2025-08-14), p19-22enphase.com ↗
Where installers ask this
- Why does my production and consumption mirror each other? (r/solar)
- reddit.com/r/enphase/comments/1h6mn74/
- reddit.com/r/enphase/comments/1cb5w6x/
- reddit.com/r/enphase/comments/1c0uemg/
- reddit.com/r/enphase/comments/1lwc88d/
General guidance based on the manufacturer's manual or the named source. Always follow the current manual for your exact model and your national code. DC and AC electrical work is for qualified installers only. Not affiliated with or endorsed by any brand named; trademarks belong to their owners.