Savage1ZA wrote: ↑
Sun, 07 Oct 2018, 01:37
Welcome to the forum.
Is there any new / additional information available about the error 51?
You may be providing it here; see below. Error 51, for other readers, is documented in the user manuals as "Over current or surge". It seems to relate specifically to inverter current. There are separate limits for battery and line (bypass) modes; I assume that your problem is only when in battery mode.
My 5KW Axpert also now out of the blue, started with this very intermittently. What's also very strange to me, is that it only occurs during VERY hot and sunny conditions (30C+ ambient).
This suggests something is drifting with temperature, and the temperature may be elevating because the solar charge controller is working hard.
Irrespective of load, and never during the night.
If there really is no correlation with actual load, then that strongly suggests that the problem is a measurement problem, not an operating condition problem.
My PV is also very close to the max acceptable parameters (as someone else posted) - I too, will be disconnecting my PV tomorrow to see whether the fault / issue persists without the PV connected. Someone else said they stopped experiencing the problem after disconnecting the PV.
The correlation with PV has been mentioned before. I can't see how it makes any difference to the main firmware. So it may well be that the SCC (Solar Charge Controller), which is now packed in rather tightly with the main board components, is causing heating of some measurement components, e.g. the hall effect current sensor for inverter current.
What is your main firmware (U1) version number?
If it's earlier than 73.00, the it may not be working the fans hard enough. In 73.00, they increased the fan speed for a given PV power. Initially, I thought that this was a way of making the inverter cool harder during the day, and be more quiet at night when people appreciate the quiet more. But now it looks like the SCC might need more cooling than it used to, certainly more than back when the SCC heatsink used to be on top of the inverter. So updating to factory or patched firmware based on 73.00 might be a simple solution. It might also be worth noting the inverter temperature when the overload happens.
Instead of a sensor drift error, it might be that the inverter automatically derates its maximum inverter current limit as the temperature increases. I've not seen this in the firmware so far, but I haven't been looking for it, and might just not have come across it as yet.
The other possibility is that some EEPROM settings might be corrupted somehow, causing up to about 25% scale errors, and possibly offset errors as well. There is a command to reset these to factory defaults, but I would not recommend using it except as a last resort. You would lose any factory calibrations by using that command. There are commands to adjust the scale and offset eeprom calibration values; this would be better if you notice that power readings are consistently in error, and suspect that these errors are pushing your inverter to think that it's over the limit. But you say that there is no correlation with load, so this seems unlikely in your case.
[ Edit: Added sentence about losing factory calibrations if using the force all EEPROM to defaults command. ]
Learning how to patch and repair PIP-4048 inverter-chargers and Elcon chargers.