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 202 — PV Hardware Overcurrent Fault

Sungrow code 202 means "PV hardware overcurrent fault": the current coming in from your solar panels on PV1 or PV2 exceeded the inverter's hardware protection limit, so it shut down to protect its input stage. The official Sungrow description is blunt — "The PV1 or PV2 current exceeds the protective value." It is usually triggered by abnormal grid fluctuations or a panel/string wiring issue; the inverter recovers on its own, but a repeating 202 needs your installer to check the array wiring.

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's DC inputs are not bottomless: each PV input (PV1, PV2, and so on) has a maximum current its hardware can safely handle, guarded by a fast hardware trip that is independent of the slower software protections. Code 202 is that hardware guard firing. The Academy of Sungrow Distribution Europe, Sungrow's official training arm, defines it as "PV hardware overcurrent fault (fault code: 202)" with the fault condition "The PV-current is higher than the hardware protection value." Sungrow's string-inverter manuals add the input detail: "The PV1 or PV2 current exceeds the protective value."

How does panel current exceed a hardware limit in the first place? Panels are current sources whose output rises with sunlight — and, crucially, with how they are wired. Two strings accidentally paralleled into a single MPPT input will happily deliver twice the expected current on a bright day. A shorted panel or a damaged cable can dump abnormal current into the input. And Sungrow's own troubleshooting notes an interesting subtlety: the fault is "generally caused by abnormal fluctuation of power grid" and can recover by itself — grid-side transients can reflect back through the inverter and momentarily push input current past the trip point.

That is why the official guidance is two-tiered. A one-off 202 that clears and never returns was most likely a transient — grid or weather — and needs nothing more than watching. A 202 that repeats, especially on bright days at high production, is telling you something structural: string configuration, a wiring fault, or a damaged panel. Note the neighborhood: code 200 is bus hardware overvoltage, 201 is bus undervoltage, 203 is PV input voltage exceeding the bus voltage — the 200s are the hardware-protection family, and they all mean the inverter saw something its power stage should never have to swallow.

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

Two strings mistakenly paralleled into one MPPT input, doubling the current on bright days.
A shorted or damaged solar panel dumping abnormal current into its string.
Damaged DC cabling or a crushed connector creating a partial short.
Array reconfiguration (new panels added) that pushed an input past its current rating.
Grid-side voltage transients reflecting back and momentarily spiking input current.
A failing input-stage component inside the inverter misreading or mishandling current — rare, diagnosed by elimination.

Safe steps to try

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

Check whether the fault was a one-off: a single 202 that cleared on its own after a grid event or storm usually needs no action.
Note the conditions — bright midday sun at peak production versus dull weather. Bright-day repeats point to string configuration.
Think back to any recent work: new panels added, strings rewired, or storm damage? Tell your installer exactly what changed and when.
From the ground, look for visibly damaged panels (cracked glass, burn marks, hot-spot discoloration) — look only, never touch.
Do not rewire strings, move DC connectors, or open combiner boxes yourself — DC arc and shock risk.

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 code 202 recurs, especially on sunny days. The installer needs to verify the string configuration against the inverter's per-MPPT current limits, insulation-test the DC cabling, and check for shorted panels. Sungrow's official line for repeated faults is to provide the inverter's logs and fault recording to technical support for analysis. Never open the inverter or handle DC connectors under load.

Frequently asked questions

Will code 202 clear by itself?

Yes, if it was transient — Sungrow's own notes say the fault generally recovers on its own when caused by grid fluctuations. The inverter restarts once conditions normalize. Repetition is the signal that something structural needs checking.

I just had extra panels installed and now I see 202. Related?

Very possibly. Adding panels or paralleling strings can push an MPPT input past its current limit on bright days. Call the installer back — the string layout likely needs correcting.

Is a PV overcurrent fault dangerous?

The hardware trip exists precisely to prevent damage, so the inverter protected itself. But the underlying cause — a shorted panel or miswired strings — can be a fire risk, so a repeating 202 deserves prompt professional attention.

What's the difference between code 202 and code 021/022?

Codes 021/022 are PV input overcurrent warnings at the software protection level; 202 is the faster, deeper hardware-level trip on PV1/PV2 current. Think of 202 as the last line of defense firing.

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 — Academy of Sungrow Distribution Europe (academy.sungrow-emea.com, official Sungrow) — "Fault code and troubleshooting steps of SHxxRS 200–210": 202 = "PV hardware overcurrent fault", fault condition "The PV-current is higher than the hardware protection value". Also Sungrow SG string-inverter user manuals (SG2–8K series): 202 = "PV hardware overcurrent fault. The PV1 or PV2 current exceeds the protective value."