Tinbum

If you want to use the USxxxxC you can but you can only use 7 of the old type. You can have up to 16 batteries in total then without a hub.
To get 9 working he's part way there.

I would change your topic heading.
Also give details of the app your using.

I use a Teensy to read the data from my Pylontech batteries on the CAN line. You will need to make sure that the speed of the pi is fast enough to not miss packages. I'm sure you will find the protocol for your batteries with a bit of googling online. I would set the pi to just snif the data first and then you will get an idea. I find CAN much easier to use but it often doesn't contain as much detail as the RS485 or RS323 (Growatt batteries are an exception to this).
Regarding putting the batteries in series.
First are they designed for it? If not you will have to devise a way to balance each individual PACK or as soon as one pack reaches 100% SOC the others will stop charging. Not necessarily due to the bms but due to the battery chemistry.

A simple search on this forum will bring up the protocols!!

I would change your topic heading.
Also give details of the app your using.

The mighty Ban hammer?! I will let the crowd decide the fate! 😄 
Jay

While it is technically possible to combine some models of batteries with the others, there's a lot of caveats and limitations.
Some of them being:
Voltage Cell count Chemistry BMS communication Warranty Based on that I can't recommend doing so. 
Upgrade as per manufacturers guidance, or sell what you have and rebuy from scratch.
 

Hi @Riaan Eloff
 
Yes, it does not.
Pylontech's BMS has very limited protection capabilities against overcharge of this type - voltage spikes caused by AC loads and PV power fluctuations that are routed by the inverter to the battery. It can protect the battery against trying to charge it to 56V (for example) with a constant energy flow, but not against the spikes.
Normally Pylontech BMS relies on the active communication with the charger (inverter in this case). Once the BMS sees that cells are almost full, it asks the inverter to lower the charging current. Similarly, when BMS sees Cell High Voltage, it generates High Voltage warning event and the inverter is supposed to stop the charging so the internal balancers can solve the Cell High Voltage issue. Cell Over Voltage Event is even higher level.
For a shame, many inverters are not listening to the BMS requests and events correctly, nor they act as being asked. Axpert(s) being one of them.
 
Not really. The damage was a result of what the original installer did and configured.
Following manuals and specsheets blindly is one thing, having enough experience to know what are you really doing is completely another thing.
 
Float voltage too high.
This is something what installer should know and set correctly, based on the actual experience with Pylontechs + Axperts.
 
If you want to minimize further damage, set your inverter according to what @Coulomb says above.
That swollen US2000 battery is K.O., but if you are going to replace it with a new one, it definitely makes sense to prevent the same damage to happen again.
 
 
BTW: If you want to know more about the Pylontech US batteries, just check some posts my thread here:
 
 
 

You want to download the log files with  BatteryView and check them.

If at 49v you have cell imbalances then the cell has probably had it.

Good.
I see that you have RCT and Infinisolar in your setup. Not sure whether they are combined in parallel or standalone, but this is reality:
If parallel, then they are not able to talk to Pylontech If standalone, one of them can be connected to LV HUB via RS485 and a special RS485 BMS card (aka Goldfinger) from Voltronic. But I tried that in the past and it sucked. Not worth the hassle. Just a note: in your setup the LV HUB is completely useless. If it is not being used by the inverter nor by the Solar Assistant then there is no point of having it in the system.
Focus on creating one large group and connecting its master to the SA.
 
 

Same one.

You can only have 7 of the US3000A in daisy chained. If you look in the manual for the 3000C it gives the positions for the different types..
For banks you can use the RS485 as shown in the manual, I think.

I checked the manual. These are the same instructions as Youda shared. I am expecting an email from Pylontech. I am going to share with you what they say. You have both been VERY helpful. This thing is very frustrating as the distributor locally is literally radio silent and when they do comment, their support is worse than useless!

@GreenMonster the problem is not the incorrect SOC, but the cell imbalance.
Some of the cells have more charge than the others, which causes that their voltage goes up too quickly at the end of charging process.
You need to either discharge these cells a bit, manually using an incadescent bulb for example, or wait for internal balancer to do it for you.
The green SMD LED is not a cell warning light, it's an indication that internal balancer is working on that particular cell.
Just lower the charging current to 1A (bench LAB power supply would be great for this), or even stop it completely. Then wait a couple of hours for the balancer to do it's job.
Meanwhile, check the readings and lights.
Once the imbalance is solved, continue with the slow charging.
The SOC will reset to 100% automatically, once all the cells will reach cca 3,46V.

It shouldn't cause the batterybto be overcharged as the current will tail to zero as long as the max voltage is correct.

You can only have 7 of the US3000A in daisy chained. If you look in the manual for the 3000C it gives the positions for the different types..
For banks you can use the RS485 as shown in the manual, I think.

Pretty sure you can do it without using a hub just using the RS485. (also shown in the manual). (if the inverter supports RS485).

It should be ok. Keep dropping the current so it doesn't go over again. Don't rush the charging. Ther will still be big differences in SOC.

Less chance of the higher SOC cells going over voltage and gives the bms chance to do its balancing.
If you can get away without paralleling then you can still increase the voltage as the current goes down.

Forget about lead acid and go for LiPo.

Less, if your using the bms  3.45 to start with. Then gradually increase as the current goes down.

Your cell SOC's are all over the place you must top balance them. Your bms will never balance them as they are too far out.

The voltages of the cells only vary at high and low voltage. Ie high or low SOC. Look up the charge curve online.