January 11, 20242 yr After fixing error code 09 (DC bus soft start failed) by replacing a few MOSFETs and IGBTs, the solar inverter stopped detecting solar panels. I checked the voltage at the fuse (before and after) and at the end of the cable. In all cases, it read 400 V. But Immediately after connecting the cables to the inverter, the voltage dropped to 0 V. Other parts of the inverter are working: it detects the battery and mains. The inverter worked completely fine before the code so I suspect the inverter and not the panels.
January 11, 20242 yr 24 minutes ago, PVguard said: After fixing error code 09 (DC bus soft start failed) by replacing a few MOSFETs and IGBTs, the solar inverter stopped detecting solar panels. I checked the voltage at the fuse (before and after) and at the end of the cable. In all cases, it read 400 V. But Immediately after connecting the cables to the inverter, the voltage dropped to 0 V. Other parts of the inverter are working: it detects the battery and mains. The inverter worked completely fine before the code so I suspect the inverter and not the panels. May be if you indicate at the end of which cables did you measure. Sorry if this is a stupid question. Just trying to know which points you measured the values.
January 11, 20242 yr 3 hours ago, PVguard said: After fixing error code 09 (DC bus soft start failed) by replacing a few MOSFETs and IGBTs, the solar inverter stopped detecting solar panels. I checked the voltage at the fuse (before and after) and at the end of the cable. In all cases, it read 400 V. But Immediately after connecting the cables to the inverter, the voltage dropped to 0 V. Other parts of the inverter are working: it detects the battery and mains. The inverter worked completely fine before the code so I suspect the inverter and not the panels. Code 09 suggest you have an Axpert type of inverter, but that is speculatiion. 400vdc Pv voltage suggest it is a high voltage pv machine eg MKS3 or upwards (kodak), but that is speculation. Can you perhaps send us detail on your machine?
January 11, 20242 yr Author 40 minutes ago, BritishRacingGreen said: Code 09 suggest you have an Axpert type of inverter, but that is speculatiion. 400vdc Pv voltage suggest it is a high voltage pv machine eg MKS3 or upwards (kodak), but that is speculation. Can you perhaps send us detail on your machine? It's MKS2 but still, good guess. This is the label: I would take a picture of my inverter but it's disassembled. Here's a generic picture:
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.