brunodu31

Dear Coulomb, Thank you again for your reply and for taking the time to share your experience. First of all, please accept my apologies for the delayed response. Unfortunately, I did not receive any email notification from the forum and only discovered your message recently while reviewing the thread. Your comments regarding high dV/dt on high-voltage PV systems were extremely interesting and may explain several observations I have made on my installation. My system consists of: 2 × PIP-5048MG / Axpert MKS II operating in parallel 450 V MPPT versions Parallel communication board installed Current sharing cable installed Common lithium battery bank The firmware currently installed on both units is: Main firmware (U1): 71.20 I am still trying to retrieve the exact U2 (display/MCU) and DSP firmware versions and will provide them as soon as I have them. I have recently located a copy of firmware version 71.86 which appears to be intended specifically for the PIP-5048MG / Axpert MKS II platform. However, I am hesitant to perform a firmware upgrade because the system is generally operating well and I am concerned about the possibility of a failed update or an unexpected regression. I have not been able to locate a copy of the currently installed 71.20 firmware and therefore I am unsure whether I would be able to revert to the existing version if problems arise. In your opinion: Would you recommend upgrading from 71.20 to 71.86? Have you seen any evidence that later firmware versions improve Error 80 occurrences, parallel communication reliability, or overall stability of parallel systems? Is there any significant risk associated with moving from such an early firmware version to 71.86? Regarding the capacitor modification you mentioned, I managed to find the Voltronic SOP describing the installation of capacitor reference: 31-013730-00G directly across the PV input terminals. Unfortunately, I have not been able to locate this component for sale, nor have I found any technical specifications associated with that reference. Could you please advise: the capacitance value; voltage rating; capacitor technology (polypropylene film, MKP, etc.); whether the modification was introduced specifically to mitigate Error 80 or more generally to reduce EMI and communication disturbances; what specifications should be used if the original Voltronic component is no longer available. Your explanation regarding high dV/dt on the PV wiring causing communication glitches is particularly interesting because it seems consistent with the behaviour observed on my installation. Although Error 80 sometimes occurs during periods of high solar activity, I have also observed a few occurrences during lower PV production conditions, which makes me wonder whether the capacitor modification improves overall communication robustness rather than addressing a single operating condition. As a side note, I have developed a Python-based supervisory system called "Energy Brain" for my installation. The goal was not to replace the inverter firmware but rather to provide higher-level energy management, battery supervision, load control, historical logging and system monitoring while leaving the inverter hardware unchanged. The system is now operating reliably and has significantly improved the behaviour of my installation. Once the project is properly documented and cleaned up, I intend to make it available to the community so that other PIP-5048MG / Axpert users can benefit from it and contribute improvements. Thank you again for all your work and for the knowledge you continue to share with the Axpert community. Kind regards, Eric Giacomini France

Dear Coulomb, First of all, please accept my apologies for the delayed reply. Unfortunately, I did not receive any email notification of your response and only discovered it today while reviewing the forum thread. Thank you very much for your comments. Your explanation regarding the high dV/dt generated by the high-voltage PV strings is extremely interesting and may explain several observations I have made on my installation. My system consists of two PIP-5048MG / Axpert MKS II units operating in parallel. I have occasionally experienced Error 80 ("CAN data loss"), sometimes during periods of high PV activity, but also on a few occasions under lower solar production conditions. I was particularly interested by your mention of the capacitor modification. I have since located the Voltronic SOP describing the installation of capacitor 31-013730-00G directly across the PV input terminals. I would be grateful if you could clarify a few points: Do you know the value and specifications of capacitor 31-013730-00G? Was this modification introduced as a corrective action for Error 80 specifically, or for a broader EMI/noise issue? Have you personally seen Error 80 disappear or significantly improve after this capacitor modification? Is the issue mainly caused by conducted noise on the PV wiring, radiated EMI, or both? Do you know whether later firmware versions (71.82, 71.86, 71.92) contain any improvements related to parallel communications or Error 80? You also mentioned cable routing improvements. Unfortunately, the link referenced in your post is no longer visible to me. Would it be possible to provide the link again or briefly describe the recommended cable arrangement? Thank you again for sharing your experience and technical knowledge. It is greatly appreciated by those of us who continue to operate these otherwise excellent inverters. Kind regards, Eric Giacomini France

Error 80 on Two 5048MG / Axpert MKS II in Parallel – Looking for a Real Technical SolutionHello everyone, I am looking for feedback from users who have operated two or more Voltronic-based inverters in parallel, especially: MPP Solar 5048MG Voltronic Axpert MKS II Rebranded Axpert MKS II derivatives For clarification, the 5048MG is essentially the same hardware platform as the Voltronic Axpert MKS II sold under different brand names in various countries. My installation2 × 5048MG inverters in parallel (single phase) Firmware 71.20 on both units Serial numbers: 92931807100005 92931807100027 Parallel board installed Parallel communication cable installed Current sharing cable installed Identical battery cable lengths Identical AC wiring Common battery bank Same settings on both units Installation performed according to the official Voltronic / MPP Solar parallel installation guide The system generally works very well and can operate for days without any issue. The problemI occasionally receive Fault 80. According to the official parallel installation guide, Fault 80 is simply described as: "CAN data loss" Unfortunately, the official documentation provides almost no technical explanation beyond: check cables restart inverter That is obviously not a serious root-cause analysis. What I have already checkedParallel communication cables Current sharing cables Battery cable lengths AC wiring symmetry Load balancing between inverters Firmware consistency Battery bank sharing Everything appears compliant with the installation guide. What is frustratingI am clearly not the only one experiencing this problem. A large number of users on forums report intermittent Error 80 on 5048MG / Axpert MKS II systems operating in parallel. The fault is often: intermittent difficult to reproduce absent for hours or days triggered during transitions or heavier loads MPP Solar responseI contacted MPP Solar support. Their response was essentially: Frankly, I find this answer disappointing. These inverters are still fully operational and continue to be widely used worldwide. I am not looking to replace two perfectly functional inverters because of a sporadic communication fault. I would much rather understand the actual cause and solve it properly. Questions for experienced usersHave you experienced Error 80 on 5048MG or Axpert MKS II units operating in parallel? Were you able to identify the root cause? Did replacing the parallel communication cable help? Did replacing the current sharing cable help? Did shielding the communication cables help? Did grounding modifications help? Did you find a firmware version that improved stability? Is Error 80 really related to CAN communication, or is it sometimes a symptom of another synchronization issue? Has anyone obtained a genuine technical explanation from Voltronic or MPP Solar? Did anyone completely eliminate Error 80, and if so, how? Additional observationsI have occasionally observed: transient load sharing asymmetry differences in PV production between the two inverters occasional synchronization disturbances rare communication-related warnings However, the system may also run perfectly for days before Error 80 suddenly appears. This makes me suspect that the issue may be related to: parallel communication timing current sharing synchronization CAN communication robustness firmware behavior or a combination of several factors Any technical information, oscilloscope captures, firmware notes, engineering explanations, service manuals, or real-world experience would be greatly appreciated. Thank you very much for your help.