Why does my SMA WINDY BOY 3300 show 'ACVtgRPro' error?
- WWilliam FosterAug 26, 2025
If the SMA Inverter displays 'ACVtgRPro', it means the grid voltage at the connection point is too high. Check the grid voltage at the inverter's connection point. If the grid voltage is 253 V or more due to local grid conditions, ask the utility operator to adjust the voltage at the feed-in point or to agree to an alteration of the limit value 'ACVtgRPro' for voltage quality monitoring. If the grid voltage is continually within the acceptable range and this error is still displayed, contact the SMA Serviceline.















