Tinbum

I'd put it back to what it was when it showed the error so you can see the error in the new position otherwise they will say the position was the problem!

See you have now posted new photos.
I agree that the cells are badly matched and i do think pylotech should seriously look into it.

same said just today by Solis the inverter provider
If you want to connect your battery with Solis inverters, the communication ports on the inverter side are as follows:   CAN-H (Controller Area Network High) on Pin 4 (blue) CAN-L (Controller Area Network Low) on Pin 5 (blue/white)   Funny enough they dont care about interference as their official cable has 6 wire connected and 2 null in the RJ45, so I cant see the current cable I have would be any issue, especially not if the solis inverter only uses 2

Dip switches are only for RS485 and battery Groups not CAN communication.

Dip switches are only for RS485 and battery Groups not CAN communication.

Dip switches are only for RS485 and battery Groups not CAN communication.

Their is nothing wrong with his batteries. One of my stacks went from 89% to 100% in less that 30 minutes today. I've not even looked at my others. That would show as near vertical on his graph!! (EDIT another went from 90% to 100% in 9 minutes).

Different programs make the graph look slightly different . This is 100% normal for Pylon's.

This is how the pylontech charge and perfectly normal.

I was actually wanting the vid where he connects two batteries with different capacities to an inverter and uses them whilst discharging.
Did find it. 
I think it's this one, unless @WannabeSolarSparky actually has seen another one.
 

He hasn't got any comms in that test.

The currents measured are on the DC side.
 
Edit
60A DC is 60a x 48v = 2.88KW
60A AC is 60a x 240v = 14.4KW
 

The currents measured are on the DC side.
 
Edit
60A DC is 60a x 48v = 2.88KW
60A AC is 60a x 240v = 14.4KW
 

I know it was for Victron but Pylons recommendation in the manual and on the battery itself is a range.
I was wondering though, how you are supposed to set that, when the battery itself always set's it at 53.2v. Victron do change it in some of their units but if you don't have that and still use CAN or RS485?  (I do it by sniffing the  CAN messages and then adjusting them and sending them on to my inverters which are not Victron).

Have a look at
 

The thing is the pylontech bms relies on the inverter following it's instructions.

Looking at your logs you seem to have drawn some very large currents from this pack, way above those recommended. Did you have communication set up between the batteries and the inverter?

Yea I worked out his bad CAN connection basically on week one. I mean all I had to do was read the manual and see straight away something wasn't right. So its basically always been working. I called them out to look at it and he blindly insisted right in front of me that everything was correct. In the meantime I had found the pinouts online and made my own cable, so plugged it in right in front of him and showed him right there as the CAN page lit up with all the correct readings how wrong he was. He then asked me how to make the cable 🤦🏻‍♂️
Anyway it makes sense that maybe if for whatever reason the CAN fails it would revert to inverter settings, even for just a second so im gonna have backup settings on the inverter low at 52.5v across the board and then just see if i get a random alarm again at some point. its so intermittent that i might have to wait a few months. 
New battery looks great though.. charged to 100% today and is now gradually on its way back down with no issues so far. the way ive cabled them all up is also miles better than the installer so that may also help the intermittent alarm. 

The BMS link should set the voltages but I have a recollection that someone on here mentioned that the batteries will use the settings if the CAN fails. I think their was a link to a YouTube video about it. (It may have been on another forum that it wa mentioned.)
 
Personally I would expect the inverter to shut down but I don't have your inverter.

I'd personally set it a little bit lower at 52.5v. That's enough for the batteries to balance.
(I run mine at 53.2v once a week (until it gets to 100% SOC) and 52.5v for the rest of the week).

Your new battery will come at about 50% SOC. Get your old batteries to about that SOC, check the voltages of old and new are nearly the same and then connect together with as you say the new as the master. Check the manuals regarding the CAN cable pins used on the US3000C.

It looks to be a Seplos BMS in your battery so google that.

I've not heard of any 24v Pylon that can be used in series. What model are they? Are you using CAN / RS485 communication between them and the inverter?
 
From the 24v UP2500 manual.

No, sorry, it's  you who are incorrect, look at the pylontech protocol. The protocol will send error codes for the inverter to react to. That's on top of the actual normal instructions that it sends to the inverter. eg.  by limiting the currents. (0X351 bytes, 2,3,4,5)

(That's if you have a decent inverter. I am using inverters that are over 12 years old that have no problem with Pylontech batteries. That's because they were designed properly and are a quality inverter).
It blatantly obvious that the inverts in this thread can't control the voltage correctly and that's not Pylontechs problem. They say the inverter should be approved and their is a reason for that.
 

Power factor of 1:1 will keep you out of trouble. If the inverter however, had a discharge limit that could be programmed, different story but batteries need to be protected if they are installed on an inverter that has the potential to take the battery somewhere it's not rated to go.