Seplos BMS

Did you monitor it before it did? Any error messages coming up?

hadn't heard that before, what's this one about?

Had a look at the voltages just before.

Looks like I've some dodgy connections (hopefully) or batteries (not hopefully)

Hi all! I bought 2 batteries 48*100 16S with BMS Seplos.

I can change this battery for another one. But perhaps there is something I can do?

Please advise:

1. 2 batteries are connected to each other via RS485, DIP values are set: 10000000 and 01000000. I read in the Seplos manual that you need to set these values. Am I right?

2. My inverter does not have CAN and cannot be connected to batteries. He just charges and unloads them. I have set these values:

(49,6v) 5.3.15 Battery mode to mains mode voltage point

Function description: When the battery and mains exists at the same time, the battery will be transferred to the mains when it is discharged to a certain voltage to ensure that the battery will not be empty.

Setting conditions: All states can be set, and the output priority should be set in PV or PBG modes.

Explanation:

BTG: Back To Grid

(54,4v) 5.3.16 Switch back to battery mode voltage point (BTB)

Function description: After the battery is turned off at low voltage, it needs to reach a certain battery voltage value before it can be restarted in battery mode.

Setting conditions: All states can be set.

Explanation:

BTB: Back To Battery

(46,4v) 5.3.18 Battery low voltage point

Function description: Low voltage alarm point setting.

Setting conditions: All states can be set.

Explanation:

bAL: battery Low

(44v) 5.3.19 Battery low voltage cut off point

Function description: Battery low voltage shutdown point setting function.

Setting conditions: All states can be set.

Explanation:

bAU: battery Under

(55,2v) 5.3.20 Constant voltage mode voltage point setting (bCV)

Function description: Constant voltage point setting function Setting conditions: All states can be set Explanation:

bCV: battery Constant Voltage

(55,2v) 5.3.21 Floating charge mode voltage point setting (bFL)

Function description: Float voltage point setting function.

Setting conditions: All states can be set.

Explanation:

bFL: battery Float

3.Everything is fine with the first battery, but the second battery writes a warning:

@unkel

Thank you.

Please write, did I specify the correct inverter settings?

Have I correctly connected one battery to another via RS485?

How can it be calibrated or is it better to replace the battery 48*100 with another one?

I also noticed that each battery is charging 13A, although the inverter settings indicate 40A.

I have 2 battery and i need balance between.

Should i use RS to RS for balance?

If i set DIP 00000000 and 00000000 - balance is correct? Or i need use 00005000 and 10000000 for the slave?

What are you tell support Seplos?

Pretty much exact same issue as others on here now.

Cleaned all connections and used the paste.

Randomly voltage on "cell 1" is seen to be dropping to 204 and "cell 2" to 0.

There is one regular voltage read after this drop on both cells which is the frustrating thing.

Close to ripping it out at this stage.

Maybe then best to do 16s2p ?

Plugged in the new seplos this morning, batteries charging ok.

My Pi is failing to connect though, "Error code 05"

I'm wondering is there an issue with the new device being seen or needs to be added or something.

Hi

My Seplos seems to be reporting the wrong SOC based on the voltage and this seems to cause the SOC to go to 0% when the Solis inverter calls for power.

How do I reset the BMS so it calculates the SOC properly? Cells are 190Ah capacity

Also, Cell 3 seems to be imbalanced compared to the rest of the cells, I wasn't able to do a full top balance of all 16 cells together, had to do 8 & 8 cells.

The SOC on my Seplos changes to 100% when either the cell overvoltage or overall battery overvoltage protection switches off the charging.

Make sure the settings you have for these two reflects the battery getting to a full Soc. I have cells at 3.65, and battery at 56v I have the cells higher because they race after 56v at a rate the neeey can’t keep up with.

I am happy with the readings I am getting from my Seplos on Soc. However, the Solis doesn’t like it when the overvoltage protection switches off the charging and it also switches off for a few minutes with an error OV-ILLC. It resets after about 2 minutes and all is fine. I wish the Seplos had a voltage setting for 100% Soc rather that the overvoltage protection.

This worked. Thanks. Two unusual things happened, it got very overcast in the late morning and the Solis started charging from the grid. Also lost the Soc reading.

I am back now in the aobo profile with the same Seplos settings you outline above. Will know shortly how this works

Not bothered, but the neey and bms dont agree on some cell readings - guess I need to recrimp some of the connectors, 5,6,13 & 14 read slightly differently.

My additional 48 cells arrived and are now top-balanced. Just waiting on a few more bus bars to arrive before I dismantle my 10kWh battery and build my 40kWh. I'm going for a 16S4P configuration as per below. Thanks to @unkel, @graememk and @irishchris for all the helpful suggestions to date!

My configuration will sit on two industrial shelves. I have already started with the bottom shelf. Just itching now for the bus bars to arrive so I can complete the config.

Happy building to all!

Great point. I'll make that change.

@jasgrif11 - you're playing senior hurling now, lad 🤩

Best of luck with the build!