electr0n

Thanks, that was my feeling too. Not looking forward to the process though!

Do you have any recommended values? Are you not concerned about balancing problems? I don't *think* so, based on the fact that the first time it happened, my PV wasn't even installed yet, and the next time, the drop occurred after sunset when PV generation had already ceased:

The battery documentation actually makes no mention of any protocol whatsoever. However, the RS-485 wiring is the same as Pylontech and the supplier (Segen Solar) confirmed that the PYL protocol should be used in the inverter. I suppose I could try other protocols and see what happens. The BMS sets both the Bulk and Float Charge parameters in the inverter to 56.0V. This is the extent of the information offered by the manual on the topic: I don't think so, it complains loudly and quickly if any comms die. There is no pattern, apart from the fact that it only happens when there has been an extended discharge. SOC can cycle happily above 40-50% with no such occurrences, but every time it continues to discharge below 40%, the apparent remaining capacity just vanishes, though not always at the same exact SOC. I haven't, mainly because of the lack of info in the manual and hoped the batteries would know best. I can give it a try, what values would you recommend?

Hi everyone I have the following system: Inverter: Kodak OG-PLUS (Axpert King) 5.48RM - 5kW 48V Batteries: 2x parallel Fox ESS LV2600 2.56kWh 90%DoD rated Inverter & BMS comms over RS485, running Pylontech protocol - BMS has control over charging RPi running Solar Assistant for monitoring and additional control 6x JA Solar 385W mono panels (3S2P) I am very perplexed by the sudden SOC changes that my batteries exhibit during discharge to less than 50% SOC and the subsequent charge back to 100%. The issue sounds similar to that described in this thread and is illustrated in the graphs that follow. Referring to the Solar Assistant plot of the latest occurrence below, point A is the point at which load-shedding started and the batteries began to discharge. The batteries discharged as expected from A to B. However, between B and C, the SOC dropped from 46% to 11% within 3 minutes under a constant load of only 420W. (For some reason the 11% isn't shown on the scale of this graph from Solar Assistant, but when I zoom in on the data I can see it. Higher resolution plots can be found in the other attached files.) Solar Assistant is set to shutdown the inverter at SOC less than 20%, which it did, and the values shown between C and D are therefore irrelevant - they are just the last the last recorded values. The inverter remained off until grid power returned at D, at which point the batteries reported a 0% SOC. From D to E, normal charging occurred until the SOC suddenly shot up from 64% to 100% between E and F, again within the time-span of around 3 minutes! So I lose 46% capacity within 3 minutes (assuming SOC went all the way to 0 while Solar Assistant wasn't recording) and re-gain that same capacity in the same amount of time. Something is not right! This is not the first occurrence of this behaviour either. I do not generally discharge the batteries to less than 50% SOC, but the one time I did previously, a similar thing happened: The rest of the time, with less intense discharging, the batteries behave as expected. One thing I have noticed, however, is a fairly high (to me, at least) self-discharge rate of around 5% SOC over 9 hours even with no load on the batteries: Does this seem normal? Can anyone shed light on these issues? Has anyone had similar experiences? The system is less than 3 months old and has never seen more than 2.5kW of load. The batteries have not been in any way abused, yet almost 50% of my battery capacity is unusable. Out of the 5kWh of installed capacity, I've never been able to get out more than 3kWh - extremely frustrating and misleading! Initially I thought that the BMS's might not be properly calibrated and that the issue would fix itself over a few cycles, but that has not been the case. I've also charged both batteries individually to 100% before hooking them up in parallel but also to no avail. To me it seems like one of the cells might be defective or imbalanced and/or that there is a BMS fault. I'm keen to hear the opinions and suggestions of others. For more information, attached you will find images of all the Solar Assistant data, from 16 days down to 8 hours surrounding the most recent incident. Thanks in advance!

If you happen to have the Kodak OG-PLUS 5.48 RM (Rack Mount) which does have built-in WiFi (but not bluetooth), you may be wondering where to find the WiFi module PN, as I was. It wasn't displayed anywhere on my device or packaging. However, it's the name/SSID of the WiFi network that's automatically broadcasted once you turn your inverter on. So just search for wireless networks on your phone and you should find it - mine was in the form of W0821XXXXXXXXX with default password 12345678. The attached document explains the Watch Power app setup and connection with a standalone plugin WiFi module, but the built-in one works the same. Just start from page 3 and enter the PN (SSID) manually during initial registration. I also couldn't complete the configuration successfully until I'd rebooted my WiFi router, something to do with DHCP refreshing I'd guess. icba_wifi_mod_manual.pdf