Critical What does this mean?

A safety-rated fault — there may be a risk of electric shock, fire, or equipment damage. Do not try to fix this yourself. Call a qualified electrician.

Growatt Residual I High: Meaning, Causes & Safe Fix

Residual I High means the inverter detected leakage current to earth above the safe limit — a potential shock hazard. The inverter disconnects itself as protection.

What should I do first?

Two quick questions — we'll point you to the right starting point.

Is this code still showing on your inverter's display?

What this code means

Your inverter continuously monitors for 'residual current' — electricity leaking from the circuits to earth, which is what causes electric shocks. 'Residual I High' means that leakage exceeded the safety threshold, so the inverter immediately disconnects from the grid.

What is this downtime costing you?

Rough estimate while your system isn't producing. Adjust the numbers to match your setup.

System size (kW) Peak sun hours / day Electricity rate ($/kWh)

–per day

–per week

–per 30 days

≈ – kWh of lost production per day.

Estimate only — assumes ~80% real-world output vs. nameplate. Actual losses depend on weather, shading, panel direction, and your tariff.

Common causes

Moisture in panels, connectors, or cabling (most common)
Degraded cable or panel insulation
Incorrect L/N wiring
A faulty internal residual-current sensor

Safe steps to try

Work top to bottom, ticking off each step as you complete it. 0 of 5 done.

Do not touch the inverter or DC equipment more than necessary.
Try restarting the inverter once or twice, as the manual suggests (AC breaker off, DC switch off, wait 2–3 minutes, DC on, AC on).
Note whether the fault happens in damp or wet conditions.
If it clears, monitor closely and still report it to your installer.
If it persists, leave the system off.

Is your inverter still under warranty?

Before paying for a repair, check — your installer may fix this free.

Brand Year installed

Based on typical standard warranty terms — always confirm with your warranty card or installer paperwork, as terms vary by model, region, and purchase date.

When to call an electrician

Call your installer if Residual I High persists after 2–3 restarts, happens repeatedly, or occurs in dry conditions — leakage-current faults are shock-safety issues needing professional insulation testing. If you notice burning smells or visible damage, call immediately.

Frequently asked questions

What is residual current?

It is the difference between current going out and current coming back — any mismatch means electricity is leaking somewhere it should not, possibly through a person. That is why the inverter treats it as an emergency.

Is this like the safety switch in my breaker box?

Same principle, yes — your inverter has a built-in residual current monitor that works like a whole-system safety switch for the solar side.

It cleared after a restart — am I fine?

Possibly just moisture that has since dried. But recurring leakage faults mean degrading insulation, so have your installer check it at the next service rather than just keep resetting.

Need a professional?

This fault is a safety risk — do not attempt to fix it yourself. Contact a qualified solar electrician in your area.

Sources: meaning and troubleshooting verified against the manufacturer's documentation — Troubleshooting for Growatt TL&MTL (Ver1.2) 2013-7-15, Growatt New Energy ('The residual current of the inverter is detected too high'); corroborated by GROWATT MIN 7000TL-X User Manual (Error 201: 'Leakage current too high')