IcePick1957

I would suggest that you change it to "USER" which will allow you more control over the voltages. Lead Acid \ Flooded Batteries have normally 14.5 to 14.8 volt (Per 12v battery) for charging and 13.6 to 13.8 volts for float. I would use 29.2 Volts for bulk charging, 27.4 Volts for float and Cutoff voltage at 23 volts. Back to grid I use 24.5 volts and back to Battery power at 29.2 volt. That's what used when I used OmniPower AGM/GEL hybrid batteries. But it depends what voltages your batteries used for charging. Just my 2 cents.

Hi Carel, I have the same RCT Inverter as you. My experience with the past 2 years led me to believe that there are some short comings of the inverter. These inverters only draw enough power from the PV's to supply the load. It will not use all the available PV power. Mostly it will draw from your battery and use PV power to keep the batteries charged. (With setting SBU) (With SUB it's a bit of "sharing" between PV and "EKSDOM") For lead Acid Batteries, it will use power to keep batteries at 100% and if batteries are getting older the inverter will work harder (use more power) to keep them 100%. That's why it will check/charge the SOC every few seconds/minutes. (That's with AGM, FLOODED battery settings.) Is your batteries AGM, GEL or just Lead Acid? Actually it's "Bluetooth" ...... You must use "WatchPower" - (Available from Google Playstore) and is available for Android phones. That's why you may be battling to get connected. (Also the max distance from the inverter must be within 10 meters.) Just a confirmation. Your Main CPU should be vers 41.14 and MCU vers 2.61. Correct??

I have noticed, after using BatteryView, that the slave gets "Over Current Alarms"(as high as 130A). It is also charging and discharging all the time. I assume that it's trying to balance the cells, but the cells differ with about 13 - 15 ma. The temperature stays under 20 deg Celsius which tells me that the high discharge and charge currents are incorrect. Current drawn from AC Power is around 5 Amps. (Should be around 28 Amps AC if it really charging at 130+ Amps It also shows that all voltages and temperatures are normal. I think either the firmware is corrupted or the BMS hardware is faulty. The slave seems to be doing all the work while the master idles most of the time. Maybe the master is also not working 100%. When master running alone the Inverter shutdowns with Low Bus Voltage error. (That's with AC Power switched off ) I get the BatteryView "System error 256" and "ADDR Allocation ERR" on both batteries permanently. And it also appears that the batteries do not communicate. I'm trying to find an explanation and fix for the above error, but nothing comes up 100%. I have logged a call with PylonTech and my supplier. No response from both of them. I need a solution/fix quick, because I need to deal with EKSDOM loadshedding..

Like this? Better this way? I don't see anything different in operational sense... ?

I only have 1 inverter, so no need for those cables. 😉 (One less problem.) I'm just waiting for Steve to contact me as he is on the road back to Cape Town. Batteryview data on the cells of the culprit battery: Only cell 1 is lower than the others, otherwise they are well balanced. Strange thing is, it appears that the UP2500's have Phantom series batteries main boards installed. See this from Batteryview: Device address : 20 Manufacturer : PYLON Device name : UP2500 Board version : PHANTOMSAV10R04 Main Soft version : B66.28 Soft version : V1.1 Boot version : V2.0 Comm version : V2.0 Release Date : 21-07-13 Specification : 24V/111AH Cell Number : 8 Max Dischg Curr : -100000mA Max Charge Curr : 100000mA EPONPort rate : 1200 Console Port rate : 115200

Hmmm, I don't have cables like that. Only the orange and black. Parallel cables between them and the main POS and NEG cables to the Inverter. (The link between them is a RS485 Cable via the RS485 Ports.) U2 version is 2.61, Use to be 2.66 but reverted back to see if this sorted it out. (Refer my Post under downloads) I think I will update to 2.66 again tonight. (I don't trust the 2.70 as mentioned in another post.

I think the firmware software is screwed up. The slave shows drawing 130A from it when master says only 5A. (Gives a Over Current Alarm(Software) but Alarm LED on battery is off. WatchPower shows 12A. (Charging is the same story) Cell temperature is 18 degrees Celsius, cables and batteries are cold on the touch. BTW, if that was really the case, the 125amp fuse/breaker would have blown already. I have Steve looking at this as he sold me the batteries. (Also reported to PYLONTECH) Maybe a re-flash of the firmware will sort this out.

@Coulomb I have tried various pin outs and still give the problem. I managed to get Batteryview running. It gives error 256, which is address allocation error on both batteries. Both batteries are totally disconnected from everything and running stand alone. Each one has the address 20. Mean anything? Can I change this? Is their a way to reset it.

I have a problem with the Pylontech UP2500 batteries. I only linked them up to my Inverter on Friday, 20/05/2022 for the first time. ( I was busy reinstalling all my solar panels, replacing all DC and AC cables as well as redoing\re-arranging my whole setup before installing the Pylons) No communication cable between batteries and Inverter were supplied either with Pylons or with the RCT AXPERT VM3 3KW 24VOLT inverter. I had to make a cable as supplied by members on the Power Forum. (Also tried cable as suggested by PylonTech themselves) Now it gives me an error, I mean a communication error on the Inverter, Error 61. The Pylon batteries also has LED warnings, like RED Protection LED flashing with SOC LED. (With and without comms cable) I have tried to reset them, changed master and back, no difference. Battery voltage is full. BatteryView also cannot connect. Refer to the Google drive link below with video footage and pics of battery info. (Files too big to email.) Batteries are only a temp setup as I'm waiting for the Battery rack to arrive. https://drive.google.com/drive/folders/1iNZy5FPm2uouu-3cs6d2rJk2jLf_eGEq?usp=sharing Anyone that can give me some advice here will be appreciated.

Oops!! Yes It must be some gremlins that is to blame LOL! 🤣 Was suppose to be % .....

I have 2 pylontech UP2500 24v batteries installed, running with RCT AXPERT VMIII 24v 3kw inverter. According to PylonTech, the charging voltage should be between 28.3v - 28.5v. Normally cell voltage will be at 3.45volt nominal per cell. (I assume this is correct) So, 3.45v x 8 Cells = 27.6v nominal. Charging should be at least 3.46v - 3.50v to trigger balancing. This will give you around 27.8volts charging. (THIS IS HOW I UNDERSTAND THIS..) This is way lower than what PylonTech suggests. Currently I have 28.2v as my bulk charging and 28.1v as "float" voltage. Best is not to run high voltages on Lithium batteries for a long period. My aim is to run SOC between 90 and 95volts. Is this correct/good??? So, what I am asking here is, is my assumption correct here and what voltages I should use. Any advice\suggestions from you experts here will be appreciated.

A cheaper solution to measure your devices to see how much power they use is "kill-a-watt" adapter. It's fairly accurate. You can check with GEEWIZ as they stock them as well as Efergy hubs. Just inquire with them to see if they still have stock.

@Riaanh Yep, I'm also in hurry with things...... My electronic components like voltage regulators, resistors, diodes and transistors etc I order from my supplier for years now delivers it within 2 working days. So I'm used to quick delivery times and anything longer makes me "restless" . But I'm giving them a try this Saturday, spending about R 12K... Thanks for the input guys! 👍

My wife is the alarm... 🤣