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I have similar problem with my Axpert (Synerji) MKS 5K . The RS232 connection to the remote control panel works. But the RS232 Out from the remote panel with the supplied cable doesn't. I suspect wrong wiring in the cable. Cannot check because I do not have the pin out of the connector.

I experienced the same problem. I just installed my system with an Axpert MKS 5K and 9 330W panels. I installed also a remote control panel in my home office including a cable for battery monitoring. Since I'm still in tuning phase I observed this phenomena when the battery is fully charged. It even after some time remained in PV cutoff mode and discharged the battery below 90%. So I cranked the floating charge voltage (27) up to 54.5V but left the bulk charge voltage (26) at 54V. That seems to have solved the problem. When battery is full it maintains approx 51.5V by alternating in short intervals between charging at sun power and zero current.

First of all I'm afraid your 1st graph confuses kW with kWh. Remember kWh is energy (consumption), kW is power. I think your graph shows power in kW. What you should do is meter the daily consumption of your household. I made a statistic by reading and recording my meter monthly over years before installing solar. It boils down to an average daily consumption of about 10kWh. I found in internet a graph that shows for about 34°S that 9 330W panels yield in winter (June) just 10kWh per day. Important is the battery capacity. I installed 9.6kWh and found that now at a sunny day in August they will overcharge. So I'm planning to add 4.8kWh. This way it will cover a cloudy day and eventual consumption surge.

I just installed the Axpert (Synerji) MKS 5K inverter. As per battery manufacturer (LOECH) recommendation I set 29 (low DC cutoff voltage) to 40.6V. I set 12 (back to utility) Voltage to 47V. So far it works well. With little load it switches at about 10% battery charge. With 0.5C it would switch at about 20% charge. If there is a scheduled load shedding in the early morning hours before sunrise I would set 12 to 48V. 13 (back to battery) is set to 49V. It switches at about 20% charge. Note that the geyser is heated with solar panel and its electric heating is connected to the grid.

I just installed my system with MKS 5K, 9 330 W Canadian panels and 9.6 kWh battery. It works well so far and is very versatile. It's advantage is that it can operate with a remote control panel. I'm still in the tuning phase but I think I got it. It can be used with solar panels or just as a powerful UPS. Just a matter of programming it but very easy. The advantage of the higher solar panel voltage is to keep the current low. I arranged 3 banks of 3 panels in series each. That makes a max voltage of 112 V and a max total current of 26.6 A. That can be handled with 6 mm² wire.

how did I find out that I was delivered with stolen batteries? Well, such batteries are not just simple devices with 2 terminals like car batteries. These are sophisticated systems with built in microprocessor controlled battery management system, with display, keyboard and communication connectors. On the front panel is a warning label: Read the instructions before use. But there was no instruction delivered with the batteries. Not thinking of any bad I visited the website of the manufacturer LEOCH in the attempt to download the instructions. But I could not find them. So I wrote a message to please send me the instructions. The next day I got an answer from the representative agent of LEOCH in South Africa, asking me the serial numbers of the batteries and from whom I bought them. I wondered what the serial numbers have to do with the instructions and I couldn't find any on the equipment. He then explained to me that such battery are stolen from cellphone installations since this type of batteries are exclusively sold to cellphone networks. And that these are shipped with instructions, with communication cable and a software cd. Then I found the following video on internet:https://youtu.be/P2gSsN8NlRg. I immediately requested the Installer JLS-Solar in Voorbay/Mosselbay to take them back and to reimburse the money. He reclaimed them the same day but with reimbursing it went not so fast. Finally he payed back in 2 parts up to R2000. I then bought and got delivered replacement from the official importer Averge Ltd. They are technically the same as the stolen ones but light gray instead black and with slightly changed front panel.

I think I solved the problem thanks to the fact that I installed the remote control panel in my home office. So I can monitor the inverter as well as the batteries. I cranked 27 (floating voltage) up to 54.5 V but left 26 (bulk charging voltage) at 54 V. Now it switches the panels on and off and maintains about 51.5 V and never reaches more than 53 V. Anyhow it looks like I need more batteries to be able to collect all the solar energy of a day and maintain during the night.

I just installed an Axpert MKS 5K (5 kW) with 9 Canadian panels and 9.6 kWh Li-Ir-Pho battery. So far it works well. But when fully charged and reached the floating voltage it cuts off the solar panels and discharges the battery with the load down below 90%. It should maintain the floating voltage but it doesn't. I went trough the entire manual but could not find any clou. Can anybody help?

29 "Low DC cut off voltage" 46.5 V is set way to high. It should be 41 or 42 V. This might be the reason for continuous charging.