Nexuss

Hi @Dry_Reef You are putting panel strings of unequal length in parallel to each other. Don't do that, keep the parallel strings of the same length. Also, your terminology is a bit non-standard, so what you're doing is a bit unclear. In any case, rather do the following: ...

For MPPT1: - Use the old 12x330w panels in a configuration of 6s2p, that means create two strings, each of 6 panels in length, put those two strings in parallel to each other, and then feed that combined set of strings to the 1st PV input. Point all these panels in one direction on the roof, eg. all North or all East, etc.
For MPPT2: - Use the 8 new panels in a single series string, and connect all 8 panels in series into your 2nd PV input. Do NOT put any of these panels in parallel to each other. Point all these panels in one direction.

For PV1 you can expect an open circuit Voltage of 6x47.0Voc, which equals 286,2Voc, but while it is operating, you're more likely to see 6 x 37.5Vmp, which equals 225Vmp and then up to 2 x 8.89A current at full power, or up to around 17.5A current.
For PV2 (edit: previously read PV1; Typo.) you can expect an open circuit Voltage of 8x47.7V, which equals 381.6V , but while it is operating you'd see 8x39.44 Vmp, which equals 315.5V, and then up to 15.21A current.

This is your best configuration. I understand you're trying to chase an optimum Voltage, but the setup here will also work fine, all within normal range, and without clipping of any current, and without any over-Voltage.
It's okay to increase the charge rate of the battery bank. Check the battery spec sheet for the ideal recommendation, but instead of 60A you can typically set the inverter to charge 120A at least, and still be treating your batteries well, considering you've got 4x5kWh batteries.

I hope this makes sense. If there's any doubt, please double-check it with someone like @TaliaB

What's the difference apart from the phone app?
The settings on the inverter are essentially the same as the deye. At times different wordings. Impossible for one to give more savings than the other since it's the same thing.
Deye as the manufacturer you get direct access to their engineers working on the actual firmware etc if there's an issue. Sunsynk is a middle man.
Nevertheless both are good. No issues either way. Deye service centre is definitely faster than Sunsynk though at the moment.
Whichever you choose, it's a great product, comfortably amongst the best.

Its a shame to see , i actually received excellent support from Deye for my Sunsynk ,crazy to see but there is no good reason to go Sunsynk over Deye anymore .

100% agreed , that's why i cycle my batteries down to 5% every day   This is something Will prowse was preaching since way back , he cycles from 0-100% for that reason. The fastest way for the batteries to pay for themselves is to use all your capacity every day (leaving a small buffer at the end if needed for loadshedding/grid failure depending on you usage)

Hi guys,
I've realized that my first Pylontech battery will be 6 years old this March, so I've pulled some stats on the SOH and Cycles to share together with my thoughts.
CC = 52.5V
CV = 52.5V
8x US3000
System SOH : 96 % Power Volt Curr Tempr Tlow Thigh Vlow Vhigh Base.St Volt.St Curr.St Temp.St Coulomb Time B.V.St B.T.St 1 50955 -260 23000 20000 21000 3390 3399 Dischg Normal Normal Normal 100% 2025-01-30 22:16:53 Normal Normal 2 50965 -256 23000 20000 21000 3390 3400 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 3 50970 -260 23000 20000 20000 3392 3402 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 4 50948 -252 23000 20000 20000 3387 3399 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 5 50969 -256 23000 20000 20000 3389 3399 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 6 50975 -262 22000 20000 20000 3392 3400 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 7 50959 -268 22000 19000 19000 3391 3399 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 8 50945 -260 21000 18000 18000 3388 3398 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal CYCLE Times : 267 CYCLE Times : 518 CYCLE Times : 521 CYCLE Times : 523 CYCLE Times : 529 CYCLE Times : 520 CYCLE Times : 511 CYCLE Times : 501  
8x US3000C
System SOH : 98 % Power Volt Curr Tempr Tlow Thigh Vlow Vhigh Base.St Volt.St Curr.St Temp.St Coulomb Time B.V.St B.T.St MosTempr M.T.St 1 50890 0 22100 19900 19900 3387 3396 Idle Normal Normal Normal 100% 2025-01-30 23:52:12 Normal Normal 20600 Normal 2 50903 -203 22300 19900 20200 3378 3397 Dischg Normal Normal Normal 100% 2025-01-30 23:52:10 Normal Normal 21000 Normal 3 50897 -256 23300 19700 20100 3386 3396 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 21300 Normal 4 50906 -256 22300 18900 19300 3386 3396 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 20600 Normal 5 50895 -258 22000 19000 19400 3385 3395 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 20200 Normal 6 50896 -266 21900 18300 18600 3385 3397 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 19900 Normal 7 50896 -260 20900 17900 18200 3386 3395 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 19200 Normal 8 50901 -264 20600 17100 17500 3387 3397 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 18900 Normal 9 - - - - - - - Absent - - - - - - - 10 - - - - - - - Absent - - - - - - - 11 - - - - - - - Absent - - - - - - - 12 - - - - - - - Absent - - - - - - - 13 - - - - - - - Absent - - - - - - - 14 - - - - - - - Absent - - - - - - - 15 - - - - - - - Absent - - - - - - - 16 - - - - - - - Absent - - - - - - - CYCLE Times : 140 CYCLE Times : 141 CYCLE Times : 246 CYCLE Times : 233 CYCLE Times : 240 CYCLE Times : 249 CYCLE Times : 249 CYCLE Times : 247  
At a first look, it's not that bad with 96% SOH on a 6yrs old battery. But on the other hand, it's been 4% down for just roughly 500 cycles it made in that time. If linear, then after around 2500 cycles made in total, it will be at 80% SOH. If 500 cycles took me 6yrs then after 2500 cycles done in total the battery will be 30 years old. No way the battery will last for that long. Based on this, I would say that the battery will die of age well before it dies on cycles.
What do you think?
Youda

Finally got around to setting up the new gadgets
Trying out Home Assistant for the 1st time in over 3 years, must say, they have done a good job on making it more user friendly, now at last I can try out the Sunsynk flows. And all my sensors and smart switches and power meters.
Needed some tweaking to make it work with all my sensors, so far working ok

Looking good so far.
HomeAssistant picked up ALL my tasmotized devices automatically. No need to configure anything in yaml's
That was the easiest setup ever 😁 and creating customised entities was a breeze.
3 years ago with HA I gave up trying to get all my devices and their entities loaded.

 
 

If you look at the event log you will notice that the there are a number of overvoltage alarms where the highest cell voltage is above 3650mV while the lowest is around 3400mV (at the same time). One should also question how the BMS allows a cell to reach 3834mV.
There are also a number of items on the event log where the lowest cell voltage is around 3000mV while the highest cell voltages 3250mV (at the same time).
Unfortunately the data does not indicate which cell or cells is/are overvolting
Not to sure what the pack overvoltage level is on these batteries but highest pack voltage per the data was 53.295V which seems ok ? (so the overvoltage is/was not caused by a pack over voltage but rather a cell overvoltage event)
My take on this data is that there is /was likely a runner cell in this pack causing the overvoltage alarms (ie there is/was one or more weaker cells compared to the others that would reach 3650mV on charge well before the other cells and 3000mV under load also well before the other cells). If you have a runner cell your charge voltage (on your inverter) really becomes irrelevant to control this (unless you charge a very low voltages).
Unfortunately (for you) and fortunately (for Pylontech) you have no way to proof that this was the case from the start. But, given that there is only 391 cycles (does this look correct given the 6272 OV times) on this battery it is more likely than not that when you purchased this batery that this was indeed the case.
I think they are taking you for a ride and hiding behind their T&C. Unfortunately runner cell are part and parcel of pre packaged battery packs with integrated BMSes and should actually be treated as latent defects.

If @GreenFields is correct about your panels you may likely need 550W canadian solar or ja solar as alternative, they have a higher VOC rating and lower short circuit current rating AFAIK. You need to get the exact panel information from your installer so we can advise you properly.

My suggestion on solar panel replacement would be 4 x Ja 550w or if you have space 5 x JA 550w 5S1P the latter will work great providing ~210v Vmp @ 13A. Below data sheet of the JA panel range you can consider. I have use these panels in my installations and they work great with the 5kw Sunsynk.
JA-Solar-525W-550W.pdf

Please confirm the exact make & model of your Trina solar panel, or take a pic of the back data label on your panel.
Just a quick Google Search, and I found this Trina Solar 545W panel:
This panel is not suitable on your 5kW Sunsynk inverter. Even if you put on more panels to increase the Voltage and get it to start up, the problem is that the current rating (Imp and Isc) of that panel is too high. On the assumption/risk that you could have this panel - again, you should please check and confirm, and if it's indeed the same, then get an entirely new set of suitable panels. It's not about the brand or the Wattage, in this case it would be about the current.
Maximum rated power
545W
Voc
37.7V
Vmp
31.4V
Isc
18.52A
Imp
17.37A
Efficiency
20.90%
Mechanical warranty
12 years
Linear output warranty
25 years
Supplier SKU
TSM-DE19-545

Hi guys I'm still here, just busy with some projects that doesn't allow me the time to post. But I do read a lot on here. The batteries here in question were probably not well matched. If this was a DIY pack one could top balance. That involves setting them up in parallel & charging to 3.6V all together. That's some special equipment or charger required though like a variable 5V charger capable of 40A. A small Lab charger can also do the job but much much slower at 5A. 
Unfortunately this is a production battery & that makes it much harder. Because of the said warranty & voiding it if you open her up. But this high delta will never be able to rectify itself because the BMS has 2 ways to balance. Active & passive balancing. Most Battery manufacturers employ the passive balancing. I prefer the active balancing. Without going too deep into the 2 let's just say that trying to correct large delta like this once the battery is already in service is very challenging to near Impossible. 
That said warranty I'm not so sure is worth anything to be honest. Because let's face it one can call this a factory assembly defect. Nothing wrong with the cells. They just ddnt top balance them when they made the battery. Why? That takes time & involves quality control.
If it was mine I would just open it & fix the situation. However, it is what it is. Just means you don't get the full capacity of the battery. So was maybe 5kWh & you will get 4.8kWh. Not the end of the world but not great either. 

PBMS is for Pace BMS - for Pylontech use BatteryView. (available in the download section)

No as its well within the MPPT specs. I would only oversize like this on East /West split style arrays. If all the panels were facing north there is not much reason to go much more than 6,5Kw of panels so in that case i would not go more than 16 panels. 

Thanks. So using another 6 panels on the spare MPPT east facing would be fine, meaning altogether 8 (north facing) +6 panels(east)  = 14 panels  on 5kw sunsynk inverter should be Ok? 

That would be fine no problem there. There is 2 hard limits that must be respected Voc and Isc the latter for the Sunsynk 5kw inverter is 17A that won't be reached by the 445w panels. The only reason Sunsynk included the Isc rating is in the event of reverse polarity that could occur by mistake. That goes for all inverter Scc's. The Voc limit in my book is 450v. So overall yes North facing 8S1P and East facing 8S1P on both Mppt's will give you excellent solar production.

Bump. Instructions still there but no link to activate

That is fine. I'd suggest to increase the discharge amps to 111A, and the charge amps can even be a bit lower, say 80A. The current 40A is almost too low to be practical, though some might say that's the way it should be to protect the battery.

What inverter are you running it with? 
Im using ESP in the middle to alter the message for charge voltage. 

 
We can downgrade if we had 2004 fw.
Deye didn't want to provide the old binary as it was too buggy...
2004 had 57.6V charge voltage request 
The behaviour of the BMS is to set soc to 100% when any cell hits 3.6V and then switch off the charge mosfet until 99% soc is hit, then allowing charging again. 
 
With 58.4V this is sped up quite a bit and imbalanced cells reach this quickly whilst others are still 3.44V.
With charge mosfet off after this there is no equalization time. 
Anyways it's not like the balancer is up to the task, I'm adding a Neeeeeeeeey 4th generation balancer to each of my packs to fix the imbalance and void the warranty 😁
Anyways good luck deciding 

This was at 55.2V charge voltage request

Not quite - it's output is the DC bus voltage, which should be around 330V (the exact voltage depends on your AC voltage and some other factors). Apart from that, it's under software control, meaning that the response time is limited. So there exists the possibility that the current might overshoot the capability of the hardware - possibly saturating the inductor and killing the IGBT before the software even knows about it - that is why there is a Isc limit.

No , on some days when the battery is fully charged early in the day it will tend to overshoot a bit .Its not constant and varies according to loads. I have seen this on a few sunsynks so its not something that can be fixed by the end user if you are using BMS comms.

53 degrees is pretty hot , how long does the temp stay there ? does it go up quick at the end of charging and then back down pretty quick after fully charged ?
I have only seen this behavior on the new chip pylons and that battery serial on your picture is old chip if i am correct which would make this even more suspect. Could also be faulty temp sensor or the BMS starting to fail ,hard to know , try batteryview and check what it does when you go from 95 to 100% SOC. I have seen my new chip battery peak at about 46c when balancing.

It wasn't quite as bad in our house but the filling of a 2L kettle everytime to make one cup of coffee made me go out and buy a 1L camping kettle.  It also has a smaller element, so now nobody is willing to wait for it if it is full.  Problem solved, and the cleaner got the old one for free.

The current Sunsynk 16 kW inverter is a beast. 3 * MPPT Max Operating Current = 26A+26A+26A,  Max Short Circuit Current = 44A+44A+44A.
Max usable PV = 20800W.
See below for Datasheet.
Sunsynk_Max_Datasheet_v9_English.pdf
 

Buy cells from Apexium and a JK BMS and roll your own... I'd say you will be able to put together a 15kWh 16 cell LiFePO4 battery for under ZAR 40k

From my experiments it looks like pylontech just has better cells. (and for 4 times more losses, you only need double the internal resistance)