abrax

@abrax With all due respect, I think some concepts are mixed.
The screen you show in the post does not indicate any Goodwe error. The code "0" appears in PV Master (I show it in my software taken from the Inverter log) when an error condition disappears, that is, when what was an Alarm condition for the inverter firmware is no longer present.
For example, the Alarm: Nº: 512 (Utility lost) when there is a power outage of the grid generates a condition that persists until the electrical service returns to your home, where the code "0" appears.
You understand ??
In the Error Log I identify different types of Goodwe's own Alarms, status changes of internal variables of a logical type, and situations that, due to changes in the operating parameters, I estimate may be of interest to Advanced Users, as well as certain actions of the user.
The Goodwe alarms/events that you can check in PV master in this software appear in yellow letters with a red background.
If you have what you think is a problem on your Goodwe, it would be nice if you would make a separate post of this thread, so that many Goodwe users who do not use this software can give you feedback and/or benefit from solving the problem you are having or do you think you have
It would be important that when you create the Post you make screen copies of the error that the PV Master shows you in the android application in its own error log.
In this forum you will find many people willing to help you but in general they will answer you if you are clear in the presentation of the problem.
Regards !

You see Abrax, I don't know why you don't have your BackUp loads connected, it's the most important thing and the "Reason for Life" of a photovoltaic installation.
In the Error Log, this is a perfectly Normal Alarm because downstream of the home installation there could be a short circuit or a ground discharge that would trigger the protections of the Essential Loads Board and here it shows you the time it occurs. If it appears at the beginning of its execution, it warns you of a situation that is not normal and desirable
In reference to the Program Error that appears in the window that you show, it is correct, it appears in the event that you want to see the Hourly or Daily graphs and it is a BUG that appears for your particular installation since a situation was never contemplated in the program in which there is never consumption for Essential Loads. The program detects other data, but when the historical values of the essential loads (Back Up) are = 0, a failure situation occurs. Thanks for reporting it. I will correct this in the next review.

It is not an error. It is an instant diagnostic code of some data about the operation of your power inverter.
It is the same one that appears in the PV Master application at a certain time.
If you think your inverter is malfunctioning, you can report this code to Goodwe Technical Service
Don't worry. It is for advanced users.
.

I wanted to confirm that thanks to  @paul99  report, I proceeded to force a VAC FAIL condition in my house, manipulating the fault limits in the PV Master configuration for my country code.
I can confirm that the data provided by Goodwe for non-essential loads is in error during the FAC or VAC fault condition. Probably a firmware bug.
In the next version, upon detecting this condition, I will display the correct data coming out of the Logic in the schematic graph.
In FAC Failure Condition or VAC Failure due to energy outside the limits established by the configured Country Code, the Inverter goes to Off Grid Work Mode in anomaly condition.
In this condition, the AC Power Input to the Goodwe Inverter is cut to protect it and to protect the Bypass AC power supply to the Backup Loads, however this does not happen with the Non-Essential Loads that unfortunately continue to receive Power from the Grid (dirty energy ) with Over/Under Voltage Problems (VAC FAULT) or Frequency (FAC FAULT), since these loads are directly connected to the GRID.
The data delivered by the Non-Essential Energy Load Sensor in Watts must be identical to the Total Value Imported from the GRID, since due to the FAC or VAC error condition, there can be no contribution of Batteries or PV Energy to those  non-essential loads
In the next version (4.20), I will correct that misinformation from the same Goodwe sensor and the data in the schematic will make sense for that fault condition. It will also come with other news.
@sakhir  Sorry for the delay. Today I send you your key.
@abrax  Download the Program. Install it and privately send me the information that the program installation screen asks for. Try to write in English. Thank you.

I present this program that I share with you in its VERSION 2.0. It is only for Goodwe Series "ES", that is, for GW3648D-ES and GW5048D-ES.

It has been developed solely for academic and hobby purposes, without any commercial objective.
With reference to Version 1.0 of the download area of the forum, beyond the correction of errors, small aesthetic changes, elimination of erroneous information from Goodwe itself (e_day and e_total), the self-discovery of the Power Inverter within the LAN network and adding battery self-defining parameters, I found it interesting to focus on one of Goodwe's weak points, which is the error log.

Like most users who have experienced them and beyond the degree of technical knowledge, I would have liked Goodwe some more information when a "trip" occurs due to different circumstances during the use of batteries, normal operation or provoked with reference to The Working Load and Maximum Powers allowed, either in essential or non-essential loads or in both.

The operating parameters in the event of an error, the SEMS PORTAL shows them with 1 (minute) between data, a true eternity, this is of little use and the resulting query is frustrating, generally.
This topic has been mentioned among other threads here:
https://powerforum.co.za/topic/4272-victron-easysolar-5kva-or-goodwe-5048d-es/?tab=comments#comment-68163
https://powerforum.co.za/topic/6782-goodwe-tripping-problem/
https://powerforum.co.za/topic/5068-tripping-of-goodwe-inverter/
https://powerforum.co.za/topic/6275-goodwe-5048es-not-restarting-after-backup-output-trips/page/2/
https://powerforum.co.za/topic/5304-goodwe-cutting-power-to-house/
https://powerforum.co.za/topic/7085-goodwe-5048d-es-fault-tripped-with-a-bang/
Trip events ARE NOT REGISTERED by GOODWE, at least not in all circumstances from what I have seen.
Goodwe records some events that are of some use, but there are not many. These can be consulted in the PV Master application as you already know and with a descriptive text. In this system that I make available to the PowerPhorum community, the option * Error / event log * shows the GOODWE events registered in PV Master, whose code I have been able to associate with a description in red letters on a white background and with the In order for this to have a greater sense and utility, I have added to this register the fundamental parameters of Operation at the time of the Device Error, such as Temperature, Apparent Power (workload), Effective, Voltages, Loads, Batteries, etc.
The rest of the Events appear with the name "System", of these there is a group in black letters and a red background that are the Reset and Trip events, because when Goodwe is reset it does not leave any record. To partially solve this, the parameters that I show in these cases are the live values taken "1 (one) sample before the event", that is, if the update of the live data you want to set it to, for example, 1000 milliseconds and The this system finds that Goodwe rebooted at 10:25:30, for example, in the Event Log you will see the live data logged up to 10:25:29.
To be more accurate than what the Goodwe readings give, if you have higher precision instruments than the device sensors, for example with external AC meters like the Eastron SDM series,Carlo Gavazzi, etc., or for batteries using a multimeter or with a Victron BMB600 or BMV702 connected between the batteries and the Inverter, in the OPTION "PARAMETERS" the AC Voltage values can be corrected and, on the other hand, Current or DC Voltages in the state of charge or discharge of the batteries in +/- to the hundredth of a volt or ampere. In this case, in the "LIVE DATA" section of the left panel, the parameter with the [c] indication will appear. If you accept the direct Goodwe values without any correction, just leave the values at "0", I have also added the Goodwe "Self-Consumption" Value for better precision in energy calculations. My device draws between 60 and 66 watts, which is more than the manufacturer reports. You can adjust other values for greater precision that are self-explanatory.
They will also have an idea of the actual maximum daily PV voltages and amps under load conditions (V imp and A imp) of each string, which can guide us to make modifications to our strings by pushing a little further towards the Goodwe limit in a more safe.
The maximum daily values of some parameters appear on the main screen of the scheme. I emphasize that to update a maximum value, internally I consider it only if 2 (two) consecutive samples are higher than the previous one, this in order to avoid peaks due to AC harmonics and / or other electrical disturbances with very instantaneous peaks.

Your comments and suggestions welcome!