The DC component in the AC current exceeds the upper threshold. The device detects its external working conditions in real time. After the fault is rectified, the device automatically recovers. . Note a: The maximum input voltage is the maximum DC input voltage that the inverter can withstand. Note c: The PV strings. . During the self-check, the inverter checks the protection threshold and protection time of the maximum voltage over 10 min (59. S1), maximum overvoltage (59. S2), minimum. . Huawei inverters display codes (known as Alarm IDs) for memory issues, failed internal tests, measurement issues, and other faults. Many of these error codes are one-off events, but you should seek technical support if they persist – especially if you get the same Alarm ID many times. The error. . r to such a setup as an “oversized installation”. In these cases, the so-called “DC-to-AC ratio” is larger than 1, or larger than 10 how much energy is available from the solar modules. If the solar modules generate more power than the inverter can process, the inverter will automatically shift. . nvert and to feed into the grid. As soon as there is more DC power available from the solar modules the inverter is limiting the DC p wer with raising the DC voltage. For this reason the DC current is lower which is relie ing the DC part of the inverter.