Growatt Error 202: PV Input Voltage Too High
Error 202 means the DC voltage coming from your solar panels has exceeded the maximum the Growatt can safely accept. This matters: over-voltage on the input can damage the inverter, which is why it stops. The common cause is a string with too many panels for the inverter's window, and it shows up most on cold, bright mornings.
Why PV voltage goes too high
- Cold weather. Solar panels produce a higher voltage when cold, so a string that is fine in summer can spike over the limit on a freezing, sunny morning.
- Too many panels in a string for the inverter's maximum input voltage. This is a design issue if it happens regularly.
- A transient spike at start-up.
What to do, safely
- Turn off the DC isolator. This disconnects the panels from the inverter and stops the over-voltage reaching it.
- Note the conditions. Did it happen on a cold, sunny morning? That strongly points to PV string voltage, and it may ease as the panels warm up.
- Do not just keep reconnecting. Repeatedly feeding over-voltage into the inverter risks damage.
- Call your installer. They measure each string's voltage with a meter and, if a string is over the limit, redesign it (fewer panels per string). This is the real fix for a recurring Error 202.
Related Growatt codes
FAQ
Why would cold weather cause Error 202?
Solar panels produce a higher open-circuit voltage when they are cold. On a freezing, sunny morning a string can briefly spike above the inverter's input limit, triggering Error 202 until the panels warm up.
It only happens occasionally. Is that fine?
An occasional, weather-driven Error 202 that clears can be manageable, but because over-voltage stresses the inverter, it is worth having your installer confirm the string sizing is within the inverter's input range.
Sources
- Growatt inverter user manual and error-code reference (Error 202 = PV voltage high; disconnect DC isolator, check each string voltage, request maintenance).
- Growatt installer documentation.