June 3, 20233 yr Recently (for the last week), my PV reading on inverter screen (and/or via SolarAssistant) is reading a much higher voltage than I'm physically measuring at the PV combiner box or at PV input wires to inverter. I'm even getting a ~80V display/SolarAssistant reading throughout the night (with almost constant 0.1A, 5W PV)... Presumably this is some kind of measurement/firmware error of the inverter(?). I noticed it this last week due to the first cold/rainy weather pushing my "real" PV voltage slightly higher, which it seems when combined with the "fictitious" inverter PV voltage reading, causes the firmware to disconnect the PV. My panel configuration is 6 x 425W panels (2S3P). I've got a real (not clone) Axpert inverter with 73.00e patched firmware (if memory serves). Does anybody know what could be wrong and how/if it can be fixed?
June 4, 20233 yr 2 hours ago, ThisIsVikram said: Does anybody know what could be wrong and how/if it can be fixed? My guess is a hardware fault in the Solar Charge Controller, unfortunately. The recent wet weather you mentioned has probably penetrated some of the sense resistors, making them lower in resistance. It's even possible that drying them out with a hair dryer and applying some sort of coating might fix it. The problem is likely some of the four sense resistors highlighted in this photo: See this post for a little more detail, if you are handy with electronics. In my opinion, it's unlikely to be firmware related.
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.