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Growatt · PV inverters · Growatt MOD TL3-X (three-phase grid inverter, 3–15 kW)

Error 203PV isolation Low

Name in the manufacturer's documentation (user manual): PV isolation Low[1]

In plain words (editorial)

The insulation resistance of the PV side is too low – current may be leaking to earth from the cables or panels. The manual says to check, after shutdown, whether the panel frames are reliably grounded.

When to call a service technician: If the message stays, the installer must test the PV insulation; contact the manufacturer if needed.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] Installation & Operation Manual – MOD 3–15KTL3-X (GR-UM-212-A-05, AU ed. 2021-12) (GR-UM-212-A-05) , p. 27 official manufacturer document quote verified Error 203 PV isolation Low
  2. [2] Installation & Operation Manual – MOD 3–15KTL3-X (GR-UM-212-A-05, AU ed. 2021-12) (GR-UM-212-A-05) , p. 27 official manufacturer document quote verified After shutdown, check whether the panel shell is reliably grounded
  3. [3] Installation & Operation Manual – MOD 3–15KTL3-X (GR-UM-212-A-05, AU ed. 2021-12) (GR-UM-212-A-05) , p. 27 official manufacturer document quote verified If error message still exists,contact manufacturer