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Growatt · PV inverters · Growatt MIN TL-XE / TL-X (single-phase grid inverter, 2.5–6 kW)

Error: 203PV Isolation Low

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

In plain words (editorial)

The insulation of the PV side is too low – current may leak to earth. The manual lists checks of the panel enclosure and inverter grounding, whether the DC breaker got wet, and the impedance of PV+ and PV− to ground.

When to call a service technician: These checks are for the installer; if the error persists, contact Growatt.

✎ 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 – MIN 2500–6000TL-XE/X (044.0098100, ed. 2022-05) (044.0098100) , p. 23 official manufacturer document quote verified PV Isolation Low Error: 203
  2. [2] Installation & Operation Manual – MIN 2500–6000TL-XE/X (044.0098100, ed. 2022-05) (044.0098100) , p. 23 official manufacturer document quote verified Insulation problem
  3. [3] Installation & Operation Manual – MIN 2500–6000TL-XE/X (044.0098100, ed. 2022-05) (044.0098100) , p. 23 official manufacturer document quote verified Check if panel enclosure ground properly.
  4. [4] Installation & Operation Manual – MIN 2500–6000TL-XE/X (044.0098100, ed. 2022-05) (044.0098100) , p. 23 official manufacturer document quote verified Check if inverter ground properly.
  5. [5] Installation & Operation Manual – MIN 2500–6000TL-XE/X (044.0098100, ed. 2022-05) (044.0098100) , p. 23 official manufacturer document quote verified Check if the DC breaker gets wet.
  6. [6] Installation & Operation Manual – MIN 2500–6000TL-XE/X (044.0098100, ed. 2022-05) (044.0098100) , p. 23 official manufacturer document quote verified between ground (must be more than 25