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.
GoodWe Inverter Error 17 — A Homeowner’s Troubleshooting Guide
GoodWe error 17 (“PV Over Voltage”) means the voltage from your solar panels is higher than the maximum DC input your inverter can safely accept. The inverter shuts down to protect itself. This is usually a system design issue — too many panels in a string, or cold weather pushing panel voltage above the limit — and it needs your installer to reconfigure the array.
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
GoodWe's XS series user manual defines error 17 as “PV Over Voltage: overvoltage at DC input.” Solar panels produce higher voltage when they are cold — a frosty, bright winter morning can push a string's voltage noticeably above its rated value. Every inverter has a hard maximum DC input voltage, and when the array voltage crosses it, the inverter trips error 17 and stops. It has to: exceeding that limit can permanently damage the inverter's input electronics, so the shutdown is the protection working.
The most common root cause is string design — too many panels wired in series for the inverter's voltage limit, leaving too little headroom for cold mornings. It can also appear after panels were added to an existing string without rechecking the voltage maths, or when a replacement panel with higher voltage characteristics was mixed into the string. GoodWe's own troubleshooting starts with exactly this check: whether the PV string voltage exceeds the inverter's input specification, and if so, the string must be reconfigured. A drifting voltage measurement inside the inverter is possible but rare — design is the suspect in the vast majority of cases.
Unlike a grid fault, this one will not fix itself with patience — if anything, it gets more likely as winter approaches. The array must be rewired, typically by splitting an over-long string into two shorter ones, and that is strictly installer work with the DC side safely isolated. Do not be tempted to simply wait for warmer weather: every overvoltage trip stresses the inverter's input stage, and living with the fault shortens its life. One call to your installer resolves it properly.
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
- Too many panels in series for the inverter's maximum DC voltage — the classic design error; cold weather then pushes the string over the limit.
- Cold, bright mornings — panel voltage rises as temperature falls, so a marginal string trips on the coldest days of the year.
- Panels added to an existing string — extra panels raise the string voltage beyond what was originally calculated.
- Mixed panel models in one string — a replacement panel with higher voltage characteristics unbalances the string.
- Inverter voltage measurement fault — rare; suspect this only if the string design is verified to be well within limits.
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
Call your solar installer as soon as error 17 appears — this fault always needs professional correction. The installer will measure the string open-circuit voltage, check it against the inverter's maximum DC input rating with temperature correction applied, and reconfigure the strings (usually splitting one long string into two). Never open the inverter, touch DC terminals, or attempt to rewire strings yourself. If the system is new, the installer should correct the design under their workmanship warranty.
Frequently asked questions
Why does error 17 happen on cold mornings?
Solar panels produce higher voltage when cold. A string that sits just under the inverter's limit on a mild day can exceed it on a frosty, sunny morning — which is why this fault is seasonal and often appears for the first time in winter.
Can I remove a panel myself to bring the voltage down?
Absolutely not. Working on live DC strings is dangerous and requires a qualified installer with proper isolation procedures and test equipment. This is not a DIY job under any circumstances.
Will error 17 damage my inverter?
The inverter protects itself by shutting down, so a single trip is unlikely to cause harm. But repeated overvoltage events stress the input electronics — get the string design corrected instead of living with the fault.
My system worked fine for years — why is error 17 appearing now?
Panels age and their characteristics shift slightly, but more often something changed: panels were added, a panel was replaced with a different model, or you are simply seeing the coldest weather since the system was installed. Your installer can measure the string voltage and confirm the cause.
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 — GoodWe GW XS Series Grid-Tied PV Inverter User Manual (EN), official GoodWe manual hosted on emea-test.goodwe.com (GoodWe EMEA download site) — Error Message table: 17 = “PV Over Voltage”, “Overvoltage at DC input”. PV overvoltage troubleshooting (check string voltage against inverter input specification; reconfigure the PV string if it exceeds the limit) per GoodWe's official GW series user manual (admin.goodwe.com).