I84RiS

I agree, with two inveters you double your chances of something actually failing.

On my batteries with a PACE BMS the SOH is calculated only when you do a deep discharge and hit UVP on any cell.
By example, let's say it is a 100AH original capacity, and you hit UVP on a cell when the battery SOC is 5%, then the SOH will be set at 95% (being the 100% original capacity less then 95% you used until UVP).
Just note that this is firmware based, and since PACE supplies hardware to a number of different battery manufacturers with different firmware needs the logic might well be different on different batteries.
I had a few videos of this since I tested it a while back with a battery that had a bad cell to show the manufacturer what was happening for the warranty claim.
I completely ignore SOC on my batteries (with the exception of cell balancing) and use voltage alone without BMS communication.
I use SA to taper down charge current as voltage increases to ensure sufficient absorption time. Have set the PACE BMS to trigger 100% SOC when pack voltage hits 55.2v AND the charge current drops below 0.5 Amp in order to make sure cell balancing is triggered (once charge current stops cell balancing only continues if the 100% SOC was triggered).
I try and do a deep discharge (sub 2% SOC) at least once every quarter to check battery health.

On my batteries with a PACE BMS the SOH is calculated only when you do a deep discharge and hit UVP on any cell.
By example, let's say it is a 100AH original capacity, and you hit UVP on a cell when the battery SOC is 5%, then the SOH will be set at 95% (being the 100% original capacity less then 95% you used until UVP).
Just note that this is firmware based, and since PACE supplies hardware to a number of different battery manufacturers with different firmware needs the logic might well be different on different batteries.
I had a few videos of this since I tested it a while back with a battery that had a bad cell to show the manufacturer what was happening for the warranty claim.
I completely ignore SOC on my batteries (with the exception of cell balancing) and use voltage alone without BMS communication.
I use SA to taper down charge current as voltage increases to ensure sufficient absorption time. Have set the PACE BMS to trigger 100% SOC when pack voltage hits 55.2v AND the charge current drops below 0.5 Amp in order to make sure cell balancing is triggered (once charge current stops cell balancing only continues if the 100% SOC was triggered).
I try and do a deep discharge (sub 2% SOC) at least once every quarter to check battery health.

On my batteries with a PACE BMS the SOH is calculated only when you do a deep discharge and hit UVP on any cell.
By example, let's say it is a 100AH original capacity, and you hit UVP on a cell when the battery SOC is 5%, then the SOH will be set at 95% (being the 100% original capacity less then 95% you used until UVP).
Just note that this is firmware based, and since PACE supplies hardware to a number of different battery manufacturers with different firmware needs the logic might well be different on different batteries.
I had a few videos of this since I tested it a while back with a battery that had a bad cell to show the manufacturer what was happening for the warranty claim.
I completely ignore SOC on my batteries (with the exception of cell balancing) and use voltage alone without BMS communication.
I use SA to taper down charge current as voltage increases to ensure sufficient absorption time. Have set the PACE BMS to trigger 100% SOC when pack voltage hits 55.2v AND the charge current drops below 0.5 Amp in order to make sure cell balancing is triggered (once charge current stops cell balancing only continues if the 100% SOC was triggered).
I try and do a deep discharge (sub 2% SOC) at least once every quarter to check battery health.

All values in the log represents mv, ma and mah so the 13570ma = 13.57A

The AM2s are NMC vs the LBSA LFPs, they cannot be used together.

The AM2s are NMC vs the LBSA LFPs, they cannot be used together.

LiBMS screen showing 100A discharge limit. Something likely wrong with the inter battery communication, or dips switches set incorrectly or something not correct with the battery inverter communication.

Thanks for your input, I84RiS.
As stated much earlier in this thread: "...I make use of the internal temperature reported by the BMS to the inverter every few minutes - can't tell you if it's an average of individual cell temps, though..." Perhaps you have some insight on this?
Again, as stated earlier in this thread: "...I can confirm that my 2kWh early morning extraction from the batteries increase the BMS temperature (inside the slightly heated and insulated box...) by between 0.2 and 0.3 degrees C"
The batteries heat up by about 1.1 - 1.3 degrees C when charging roughly 6kWh from about 07:30 to about 11:00 in the mornings, charging at roughly 50A - thus roughly double as effective in heating the batteries than discharging them."
That's substantially less than what you are reporting during cycling of the battery - presumably my BMS is reporting an average of the cell temperatures, but I have no way of actually confirming this. Regardless, the 11 degree difference between your cell temperatures and the "inside the battery enclosure" temperature is rather larger than the approximately 4 degree average difference that I measured between the median temperatures of the seven distinct temperature periods, or the maximum variation of only 7 degrees over the +3 month period reported in the graph above. I suspect this is probably as a result of the good insulation of my batteries, and (maybe) a small contribution by the two 7W heating mats.

Anyone else noticing that SA is now charging for the software updates?

Anyone opted out of the new terms that is still on the Beta program and receiving the updates?

You have the option now.
Perpetual use remains - a one-time purchase still grants you lifetime use of SolarAssistant.

You can opt out to continue using your original license terms: one device, non-transferable, with free lifetime updates.

https://solar-assistant.io/help/updates/terms_update_oct_2024

Shoto uses a PACE bms if I recall correctly?
Have you checked if the batteries starts discharging at the same time, in other words, after fully charging them to 100% SOC and then using the batteries to supply the load, does each battery start discharging at the same time?
The PACE BMS will close the discharge MOSFETS when a cell triggers the Overvoltage Protect alarm during charging, normally set at 3.65v. The BMS will keep the discharge MOSFETS closed as it is trying to balance the cells even though the inverter might be pulling load from the other batteries.
So you might have a situation where 1 or 2 of the batteries only start supplying load when the others are already down to 90% SOC (by example). The bigger the battery bank the more pronounced this effect can be, since the BMS will only open the MOSFETS when the load warrants it (is big enough), and since you have 4 batteries in the bank this will need to be a substantial load.
This effect is also more pronounced in winter since the batteries have less time to balance the cells.
I had the same issue, eventually solved it by adjusting settings to avoid hitting OVP. The local importer could not solve this, eventually the Chinese manufacturer pointed us to PACE who supplied me with a sollution.

Do you have access to individual cells voltages?
Based on the few examples you have posted you are seeing inconsistencies at the SOC level when the inverter switches back to grid. The only constant in the examples is a large load on the battery bank before the switch back to grid.
My guess is that the BMS forces the inverter back to grid because of a weak cell reaching the UV protection point due to large load. So basically a battery issue and nothing to do with inverter settings.
You can try and test this by reducing the load to something more manageable for the battery and see if the same happens (obviously you will have to discharge for a longer period).
You can also see if the same occurs by removing the communication between the battery and the inverter (and using voltage settings) thereby removing the BMS ability to force the inveter to grid. You might however end up with a battery that has gone into protection mode should it really be due to weak cells.

Was the 1st picture of the battery stats taken at the same time? If you look at the picture you will note that the batteries are at different voltages which is odd for a parallel connection.
Does any of the cells ever reach 3.65V during charging which will trigger the OVP? This might explain the different pack voltages in the 1st picture showing battery stats.
This might also help explain the different rates of discharge. Looking picture of the battery stats showing uneven discharge it seems like one of the packs is supplying the load while the other is still sitting idle at 100% SOC. This is a common symptom when there is a OVP event since some BMSes (don't know these batteries, not sure if it applies here) will keep the battery at 100% SOC for as long as possible to help with cell balancing. The PACE BMS is one that does this.
It is likely that your charging voltage and float voltage is to high. Reduce it as already mentioned is the earlier post.

Yes, this is spot on
If the passive dissipative balancer with small resistors built into most of bms we see is not enough to keep up with the balancing of low current cycling often seeb in home PV systems then you likely have unmatched or defective cells.
Using active balancers will only mask the problem, it wont fix it. If the cells are not highly matched in capacity then you will always run into either top OV or bottom UV issues no matter how often the cells are balanced.
The only solution here is to use the batteries, by example in the 20% to 90% SOC range, and just accept that you have less capacity. Hitting cell OV and UV frequently is not good to the health of the specific cell and will likely lead to premature battery failures once the cycle count gets high (this forum is full of such posts)

Also check any fuses on the DC side (maybe replace them). To rule out issues with the cells you will need access to cell data.
During a normal evening where the load is low, to what SOC level does the battery discharge overnight?
Does it ever discharge to 0% instantly (as opposed to 6% in the OP) this would hint to a cell issue.

Yes, this is spot on
If the passive dissipative balancer with small resistors built into most of bms we see is not enough to keep up with the balancing of low current cycling often seeb in home PV systems then you likely have unmatched or defective cells.
Using active balancers will only mask the problem, it wont fix it. If the cells are not highly matched in capacity then you will always run into either top OV or bottom UV issues no matter how often the cells are balanced.
The only solution here is to use the batteries, by example in the 20% to 90% SOC range, and just accept that you have less capacity. Hitting cell OV and UV frequently is not good to the health of the specific cell and will likely lead to premature battery failures once the cycle count gets high (this forum is full of such posts)

Also check any fuses on the DC side (maybe replace them). To rule out issues with the cells you will need access to cell data.
During a normal evening where the load is low, to what SOC level does the battery discharge overnight?
Does it ever discharge to 0% instantly (as opposed to 6% in the OP) this would hint to a cell issue.

Agree that they should share the current proportionally, but what I have noticed from experimenting with different brand LFP batteries (all 100A) in the same system is that there are differences between them resulting in different discharge and charge rates between the different brands.
During charging, one battery might reach 100% SOC while a different brand is still on 95%. In this case the full current is passed to the remaining battery which might (or might not) exceeds the recommended charge current. The same happens during discharge.
I used to manage this with SA by tapering down the charge and discharge currents at certain SOC levels.
Here is a recent example, yellow and red are different brands to blue and green (so 3 different brands in 1 system). All have PACE BMS. I am reading the data into SA through the RS485 B port on the 1st battery. Dip switches were set slave 1, slave 2, slave 3 and slave 4 (no master). It does not matter is which order I connect the 4 batteries to the busbar, the result is always the same. 

Agree that they should share the current proportionally, but what I have noticed from experimenting with different brand LFP batteries (all 100A) in the same system is that there are differences between them resulting in different discharge and charge rates between the different brands.
During charging, one battery might reach 100% SOC while a different brand is still on 95%. In this case the full current is passed to the remaining battery which might (or might not) exceeds the recommended charge current. The same happens during discharge.
I used to manage this with SA by tapering down the charge and discharge currents at certain SOC levels.
Here is a recent example, yellow and red are different brands to blue and green (so 3 different brands in 1 system). All have PACE BMS. I am reading the data into SA through the RS485 B port on the 1st battery. Dip switches were set slave 1, slave 2, slave 3 and slave 4 (no master). It does not matter is which order I connect the 4 batteries to the busbar, the result is always the same. 

Agree that they should share the current proportionally, but what I have noticed from experimenting with different brand LFP batteries (all 100A) in the same system is that there are differences between them resulting in different discharge and charge rates between the different brands.
During charging, one battery might reach 100% SOC while a different brand is still on 95%. In this case the full current is passed to the remaining battery which might (or might not) exceeds the recommended charge current. The same happens during discharge.
I used to manage this with SA by tapering down the charge and discharge currents at certain SOC levels.
Here is a recent example, yellow and red are different brands to blue and green (so 3 different brands in 1 system). All have PACE BMS. I am reading the data into SA through the RS485 B port on the 1st battery. Dip switches were set slave 1, slave 2, slave 3 and slave 4 (no master). It does not matter is which order I connect the 4 batteries to the busbar, the result is always the same. 

Agree that they should share the current proportionally, but what I have noticed from experimenting with different brand LFP batteries (all 100A) in the same system is that there are differences between them resulting in different discharge and charge rates between the different brands.
During charging, one battery might reach 100% SOC while a different brand is still on 95%. In this case the full current is passed to the remaining battery which might (or might not) exceeds the recommended charge current. The same happens during discharge.
I used to manage this with SA by tapering down the charge and discharge currents at certain SOC levels.
Here is a recent example, yellow and red are different brands to blue and green (so 3 different brands in 1 system). All have PACE BMS. I am reading the data into SA through the RS485 B port on the 1st battery. Dip switches were set slave 1, slave 2, slave 3 and slave 4 (no master). It does not matter is which order I connect the 4 batteries to the busbar, the result is always the same. 

8 Cells is a 24V battery, not a good idea to connect a 24V battery in parallel with a 48v battery. 
Some "48V" batteries have 15 cells and some have 16 cells, you can't mix them due to the different operating voltages. 
A 16-cell LiFePO4 battery typically has a nominal voltage of 51.2 volts. This is because each individual LiFePO4 cell has a nominal voltage of around 3.2 volts, and 16 cells multiplied by 3.2 volts equals 51.2 volts. 
Key points about 16-cell LiFePO4 batteries:
Nominal Voltage: 51.2 volts
Full Charge Voltage: Around 57.6 volts (depending on the specific battery)
Discharge Cut-off Voltage: Around 48 volts 
A 15-cell LiFePO4 battery typically has a nominal voltage of 48 volts as each cell in a LiFePO4 battery is considered to have a nominal voltage of 3.2 volts, so 15 cells in series would equal 48 volts (15 x 3.2 = 48). 
Key points about a 15-cell LiFePO4 battery:
Nominal voltage: 48 volts
Per cell voltage: 3.2 volts
Application: Often used in systems requiring a 48 volt power supply 
I disagree with @I84RiS on the max charging amperage of the batteries. The power absorption of the batteries will be higher when they are in parallel than each of them individually so you can set to the max charge amperage of the larger battery quite safely as the current will be spread across the batteries proportionally to their capacity. i.e. If you have a 200Ah and 100Ah in parallel and give it 30A, 20A will be absorbed by the 200Ah and 10A by the 100Ah. 
 
 
 

Is this still avail? I need 6 pleaze
0812360665