PeterPan

I had the same issue with my Mecer SOL-I-AX-5M4. Bought a couple of weeks ago from Mustek in SA. Read this thread and tried setting charge priority to Solar First. Started with AC Max charge amps as 2A as well and problem seemed to be solved. Changed charge current to 10a and still problem seems to be solved. So I will be increasing my charge current even more to see what happens. As a side note, I have 1 x JA Solar 545w panel which is not enough for this inverter as min solar volts are 120v. (adding more panels soon) So my solar switch was disconnected (both wires I believe) and I still had this problem every time loadshedding ended. My battery would charge for about 15-30min before error F08. Depended how far the battery was depleted I guess. I got the idea that as soon as the inverter changed from bulk charge to float, the error F08 showed up. It gave a long beep and restarted itself. After that the charge current would drop from 40A to 20A and all went well to charge battery to 100%, but then this will repeat itself after every load shedding. I am using a Sunsynk 5.32 battery and a coms cable I made myself. Thanks for this thread and thanks for this solution! I guess this is something the manufacturer needs fix in a firmware update maybe.

Hi everyone Here is a fix! I had the same problem. Bought a Mecer SOL-I-AX-5M4 a few weeks ago. Also bought a Sunsynk 5.23kwa battery with it. Connected it all up and seemed to be working fine. Then I found that every time load shedding ends, the battery will start charging and 15min-30min later the inverter sounds a long beep and restarts. After the the charging will continue and all is fine again. The fault error was F08 (bus over / battery voltage too high). I read through another 10 page thread (https://powerforum.co.za/topic/4721-axpert-mks-ii-5kw-error-08/) about these Voltronic inverters which all seem to have this issue since.. well since long ago! Seems like Voltronic is just not interested in fixing this issue. However, to fix this using settings, you can just set your battery "Charge Priority" to "Solar First". In the other thread I read, they also mentioned that the AC Max Charge Current needs to be set to 2A, but this will mean that charging will take very very long. I have increased mine to 10A already and it is still working fine. I will be testing on higher amps as well in the coming weeks. Hope this helps someone else as well.