Warning What does this mean?
Your system is down or running degraded, but this is not an immediate safety danger. Work through the safe steps below.
Sungrow Inverter Code 002 — What Does It Mean? A Plain-English Guide
Sungrow fault code 002 means grid overvoltage — the voltage from your electricity network rose above the inverter's protection limit, so the inverter disconnected to protect itself. This is a grid-side event, not an inverter failure, and the inverter reconnects automatically when voltage normalises. If it happens often, your grid operator needs to know.
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?
Is your system producing power right now?
What this code means
Sungrow's official documentation lists code 002 as “Grid overvoltage,” classified as a fault that shuts the inverter down. Your inverter constantly measures the grid voltage, and grid codes require it to disconnect when that voltage exceeds a set protection value. Sungrow's EMEA service guidance describes the fault condition plainly: the grid voltage is higher than the set protection value. When that happens, the inverter stops feeding power and waits — it does not try to ride through abnormal voltage.
Why does grid voltage rise? The classic cause in residential streets is too much solar export at once: on a sunny midday, every rooftop system pushes power into the local network while household demand is low, and the street voltage creeps up. Long cable runs from the transformer amplify the effect at the far end of the line. Sungrow's end-user guidance is explicit that these grid events do not indicate an inverter fault — the inverter is behaving exactly as designed, and you should not adjust its settings in response.
A single 002 that clears is a non-event — the protection did its job and the inverter moved on. A pattern is a different story: 002 every sunny midday, for example, is a network issue, not an inverter issue. Grid operators are responsible for keeping voltage within statutory limits, and persistent overvoltage in solar-heavy areas is something they can fix, for instance by adjusting the local transformer tap. Your job is to log the pattern and report it, not to touch the inverter. Keep a simple note of dates, times, and weather — a two-week log of midday 002 trips is far more persuasive to a grid operator than a vague complaint.
What is this downtime costing you?
Rough estimate while your system isn't producing. Adjust the numbers to match your setup.
≈ – 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
- Excess local solar export at midday — many rooftop systems feeding in while demand is low pushes street voltage up.
- Long feeder distance from the transformer — voltage rise is worst at the far end of the line.
- Light local demand coinciding with strong sun — the classic midday overvoltage recipe.
- Undersized or over-long AC cable on your property — voltage rise across your own cable adds to the grid's.
- Incorrect overvoltage protection setting — rare; only a qualified technician may verify protection values.
- Grid network issues or switching events — upstream works can cause temporary voltage excursions.
Safe steps to try
Work top to bottom, ticking off each step as you complete it. 0 of 5 done.
Is your inverter still under warranty?
Before paying for a repair, check — your installer may fix this free.
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
Contact your grid operator (the network company that owns the poles and wires, not your electricity retailer) if code 002 appears regularly — persistent overvoltage is their responsibility to investigate, and they may adjust the local transformer. Call your installer if the fault comes with a tripped breaker, or if a technician needs to verify the inverter's protection settings and AC cable sizing — Sungrow's troubleshooting for a repeated 002 includes checking that protection values are set correctly, which only qualified personnel may do. Never attempt to raise the inverter's voltage limits yourself.
Frequently asked questions
Is Sungrow 002 an inverter fault?
No. Sungrow classifies it as a grid fault and explicitly tells end users that grid codes do not indicate an inverter fault. The inverter disconnected to protect itself from abnormal grid voltage — exactly as designed.
Will 002 damage my inverter?
No — the protection operated before any damage could occur. That is precisely what the overvoltage protection is for, and a single event leaves no lasting effects. You can think of it as a fuse doing its job.
Can I stop it happening by changing a setting?
No, and you must not try. The protection values are set to your country's grid standard. Sungrow's guidance says not to adjust inverter settings for grid codes — report repeated events to your grid operator instead.
Why does 002 only happen on sunny days?
Because sunshine is when every rooftop system in your street exports at once, pushing the local grid voltage up. Midday overvoltage on clear days is the textbook pattern for this code.
Need a professional?
This fault may need professional diagnosis. Contact a qualified solar electrician in your area.
Sources: meaning and troubleshooting verified against the manufacturer's documentation — Sungrow “Grid Error Code Explanation for End Users” (GD_201805_All_Grid Error Code Explanation for End Users_V1.0), official Sungrow Australia service document hosted on service.sungrowpower.com.au — Code 002 = “Grid Over-Voltage”; guidance: grid codes do not indicate an inverter fault; do not adjust inverter settings; report repeated events to the grid operator or retailer. Corroborated by the Academy of Sungrow Distribution Europe (academy.sungrow-emea.com) Service FAQ “Fault codes 002, 003, 014, 015: Grid Overvoltage”: Code 002 fault name “Grid overvoltage”, fault type “failure shutdown”, fault condition “the grid voltage is higher than the set protection value”; troubleshooting: inverter reconnects when the grid returns to normal; if repeated, check protection settings and AC voltage measurement (qualified personnel only).