Seplos BMS

irishchris

https://www.boards.ie/discussion/comment/118605199#Comment_118605199

Keep us updated on how this works out today. Would love to see some pictures or video of your battery setup too. In process of ordering some lifepo4 cells later this month but with having a Solis 6kw inverter I'm a bit apprehensive in terms of the BMS issues.

SD_DRACULA

https://www.boards.ie/discussion/comment/118605286#Comment_118605286

I'm in the same boat with the same Solis inverter. Following this closely 😁

championc

https://www.boards.ie/discussion/comment/118605199#Comment_118605199

So what you are looking for is for the inverter to be told your capacity from the Seplos BMS. You may have an option on the Solis to decide things like the DOD, but otherwise, the Solis should become pretty dumb, and receive all it control from / by the Seplos

Geeyfds53573

https://www.boards.ie/discussion/comment/118605199#Comment_118605199

Sweet that’s sounding promising. I must check do I have that battery option. Do you have a copy of that Solis firmware?

reklamos

https://www.boards.ie/discussion/comment/118605473#Comment_118605473

Yes, I do have firmware files

reklamos

Has anyone noticed battery cycle counter in seplos software. I am not sure how it works or waht it counts as in one day it counted 4 cycles even though there was not even one.

Geeyfds53573

From @garo The cumulative discharge capacity setting should be set to 80% to reflect one cycle at 80% DOD.

Geeyfds53573

https://www.boards.ie/discussion/comment/118606154#Comment_118606154

Thanks @reklamos if needed I’ll come back to you - how’s it been running?

garo

https://www.boards.ie/discussion/comment/118608485#Comment_118608485

Yep. It defaults to 20% which means it counts a cycle as soon as 20% of the capacity is discharged.

BTW I have found the Seplos support engineer I am dealing with quite helpful. We are still trying to resolve the issue with my Growatt but he provided me the Growatt CAN protocol documentation and understands the issue pretty well. I suspect it is a new product and they are still ironing things out. Having a BMS support tons of inverters is hard work. They probably overpromised and some of us here are unwitting guinea pigs. But we should get there soon. The engineer in me quite likes the whole process of figuring all of this out.

reklamos

The setting are confusing on Seplos. Chinglish translation does not help either. Cumulative discharge is at 20% and does not allow me to change it. But today I have not lost a single cycle so not sure what is going on. Is there a document that explains all the settings?

We had a good day today with sun and I was able to track Seplos in operation. Seems like AoBo battery profile is working as expected. Once the battery was getting close to full SOC and coltage breached thresholds Seplos told Solis to throtle down and I could see that the charge limitation was changes to 10A on Solis. Once the voltage dropped the limits were raised back to normal. It is still in testing phase but does look primising.

garo

Did you login before trying to change settings? admin/admin

There is a user manual that explains all the settings. It's on google drive.

reklamos

I got the manual and am logged in with admin/admin

reklamos

Still confused why I can some change parameters in software and not the others even though the manuals says they are configurable.

Wanted to do full charge/discharge for BMS to calculate capacity but ran into problem. Charge went ok and it cut of at high voltage but I could not discharge the battery to low voltage point as the BMS did not allow to dicharge below 15% SOC. But there was still juice as all cell were above 3.1 and total at 49.5. Has anyone done full calibration cycle succesfully?

garo

You can change the low voltage protection and the min capacity parameters. Also note that forsome parameters you have to hit enter after entering the button and click download.

reklamos

https://www.boards.ie/discussion/comment/118623411#Comment_118623411

Tried that but getting command not supported

garo

https://www.boards.ie/discussion/comment/118625943#Comment_118625943

Then the value you are entering is not within the acceptable range. Most likely you have conflict either in this value and the alarm recovery value or some other pair of parameters. For example if the capacity alarm recovery number is less than 10 the BMS won't allow you to set the Alarm value to 10.

reklamos

https://www.boards.ie/discussion/comment/118626754#Comment_118626754

It was not allowing to me set any value for that alarm, be it lower or higher than 15%.

The solution is to use Set all button. But you need to make sure that the other values are also ok.

garo

Yeah its weird. Some values are settable by the Download button and others aren't.

Geeyfds53573

Seplos BMS appearing in a lot of server rack batteries. In the 220 Ah one here.

https://youtu.be/3uHxTc3YicM

batmaxpt

hi

great discussion, big fan of Seplos here also :)

for ex. i have 3 used cell 60ah in parallel 14s, what setting should i use for seplos bms measure the real soh ?

championc

Overstate the SOC and after a few full charges and discharges, it will calculate the capacity

reklamos

Finally it got calibrated, here's what worked for me:

I've set battery rated capacity and Soc in software to whatever battery rating is and also remaining capacity alarm to 10%(I am not sure if this is needed but with original rating it does not discharge low enough, even with 10% my cell were over 3.1V)

Discharged the battery till it stoped, then charged it at constant rate at 20Amps overnight. Once some cells reached monomer high voltage alarm, the charge rate dropped to 10Amps but it still kep charging. At this point sock was 74% the remaining capacity was also was not close to what was rated . It still kep charging at 10Amps and once it reached the overvoltage alarm the charging stopped, both SOC and Remaining capacity got adjusted, and that was it.

I have been told by Seplos support that you have to set battery rating within 20Ah range of battery capacity otherwise calibration may fail.

If you get errors while trying to download new settingh then use Set all button at the top.

Just dont forger to raise remaining capacity alarm from 10% once calibration finished.

reklamos

So interesting thing I noticed while testing Seplos in regarding ro discharge SOC.

When discharge SOC on inverter is higher than it is on Seplos, it works as expected. That is when discharge SOC is reached battery stops discharging.

If discharge SOC on inverter is lower than on Seplos, than it does not work as expected. The battery goes into alarm state and drops discharge current but it is still discharging at ~100W. I would assume that it would do that till inverter discharge SOC is reached or battery low voltage is reached.

So basically first option the way it should be configured but this is may not be possible with inverters that do not/cannot communicate with BMS.

championc

As I said previously, if "talking" correctly, the inverter becomes completely dumb and therefore gets it's SOC from the Seplos. Your setup has meant that the inverter is calculating the SOC from the battery voltage it sees.

Maybe it's worth trying to engage with the engineer who @garo is working with, to try and get to a point that the Seplos fully supports the Solis.

reklamos

https://www.boards.ie/discussion/comment/118652985#Comment_118652985

Oh no, the inverter is talking correctly and is getting SOC from BMS. It just depend which low point is hit first, on inverters or on BMS.

garo

Oh yeah you need to set the Inverter discharge limit to be higher than the Seplos discharge limit. Otherwise the inverter will keep calling for power and the Seplos will discharge at 250W in my case, 100W in reklamos' case. I have mine set to 16% on the inverter and 15% for alarm and 10% for protection on the Seplos.

championc

Apologies for my misunderstanding @reklamos

E30M3

Recklamos you seem to be the trailblazer on the Solis / Seplos journey and well done on the progress you have made.

When you get a final configuration that you are happy with would it be possible to show the inverter and Seplos S/W settings you utilised? I think a few of us are slightly behind you, (I got my batteries over the last two days and currently have the first 8 top balancing).

Goes without saying that this is for info only and is what works for you but may not be optimal for others.

reklamos

https://www.boards.ie/discussion/comment/118655356#Comment_118655356

I will keep reporting as I am progressing. There are still many things to learn. Probably the one diference from most is that I will go with 2 separate packs instead of 1 big one. I'll keep you posted.

Geeyfds53573

Finally got the time to get up and running - had to change the SOC to get it to discharge and a reset but copying reklamos settings for the Solis and it’s discharging away - I’ll have to read through here but I’ll have questions re settings once it does a few cycles. Thanks to all for the help, it sure it nice to see more then 1.2 kW being discharged

reklamos

Took apart the usb dongle that came with Seplos, there are no screws. Here is what I've found. It does work but what was the point of this? And this thing was $20? I will stick with the dongle that I've got early from Amazon.

championc

Well you need the dongle to configure it - and something that they don't make clear - selling it as an "optional extra" !!!

When I bought them, I certainly didn't want to take a chance on using some Chinese dongle, and struggling for pinouts details.

Yes, it's a hefty extra cost for what it is. Maybe someone at some stage will confirm that Amazon ones work fine ?

slave1

I've got one on the way from AMZ to hook up to mine, I'll let ye know how it goes

reklamos

I had this from my experiments with pylons and it works perfectly fine with Seplos.

slave1

This is the one I ordered

WINGONEER CH340E USB to TTL USB to RS485 Converter Adapter Window 7/8 XP Linux Vista: Amazon.co.uk: Computers & Accessories

Geeyfds53573

So only running 2 days all looking good but I have to go away for a few days so would the advice be to set BMS into Sleep mode? I can see the Overdischarge SOC is holding when near the bottom but I wouldn’t be confident to leave it running as not correctly calibrated but it’s not far wrong. it would prob only get stuck on high voltage alarm but I think I’m wise to stick into sleep mode? What is interval charge capacity? No 80 at 96% is it the max charge capacity?

championc

If you were there, what would you be doing with it ? I certainly cannot see a reason to power it off. You could maybe just overnight charge to 80% rather than 100%.

Overall, I wouldn't have thought you should have needed to tinker around too much with the default settings.

Geeyfds53573

Thanks championc I have not fully charged the batteries since setup at the weekend - they were fully charged initially - still fighting for a night meter just concerned if sun broke through while away - I’ll leave it be so

Geeyfds53573

Battery reached 100% today I was away but saw Solis warning

OV-Vbatt-H which is

Battery Hardware Overcurrent -Check if the battery is correctly connected or the battery contactor is disconnected, restart the battery, restart the inverter.

It happened a few times then when it started discharging warning went away and all is fine

I got the missus to take a pic of Battery Monitor which had an “intermittent power supply waiting” warning.

I’ll restart all when I return but any thoughts?

Only a 9mV difference between min and max voltage I’d say it was hogging the 100% charge for a while but I don’t think this is the real 100% at 3.34V

garo

Yes I have seen this too. Note that the charging switch is not on (below the dial). This means if the inverter tries to sense the voltage by trying to charge the battery momentarily it fails. My solution was to not let the battery get to 100%. This is annoying but I haven't found a better solution yet. I have been in touch with Seplos engineers and they suggested a bit of CAN sniffing to see what messages are being exchanged. Maybe if a few of us complain to Seplos about this they will do something about it.

Geeyfds53573

Thanks @garo thats not great - I didn’t notice the standby status - any setting to stop it getting to 100% - fine for now I can dump some into car but during the summer that will be a big issue - automation needed I’m afraid - must be happening to a lot of users

reklamos

https://www.boards.ie/discussion/comment/118680307#Comment_118680307

I had this also. I think 100% Soc is real or pretty close to it. As you can see in inverter the battery has reached overvaltage limit. This message came from BMS and that means that it has reach the top voltage that was is set in BMS. 3.34V is settled voltage. It only reaches 3.65V or whaterver you have set while charging, once charging is cut, the voltage drops and then settles. To get really close to 3.65V you would need to start charging at low amps when it is at ~95% of SoC and Seplos does not do that it only drops Amps when warning threshold is reached. The 9mV diference is also a settled one. It would have been higher when it was charging. One more thing is that at top SOC and while in stanbdy BMS does balance cells when idling and if the differnce between cells was more than 30mv.

Geeyfds53573

Thanks @reklamos I was away a few days and the battery hasn’t hit 100% again. That’s all good knowledge thank you very much. So if it is normal behaviour for the BMS any way of stopping the inverter cutting out or just wait for voltage to drop and inverter will always error a few times until charging stops?

reklamos

The 'intermittent power supply error waiting' error is the one that I am strugling with at the moment as charge/discharge cuts out alltogether and I also noticed that inverter also stops generating from solar while that error is present. I could only get rid of it rebooting seplos. I will keep researching.

Geeyfds53573

https://www.boards.ie/discussion/comment/118716253#Comment_118716253

yep that’s the one it eventually discharges and then error disappears but inverter cuts out a few times which is the part I don’t like.

E30M3

Few questions re Solis Inverter and SEPLOS BMS.

I am in the process of setting up and would be grateful for a steer from anyone with more knowledge that me (which is almost everybody!!)

1. I have top balanced my 16 200ah cells in 2 groups of 8 (took about a fortnight with a 5ah charger, but I'm not in a hurry), currently cells are within 16 mv from lowest to highest. Is that an acceptable range or is it possible/necessary to do better? On that if anyone in the Wexford area needs a loan of a DC Charger for the same purpose just PM me.
2. I think the current advice is to specify Battery Type of AoBo on the inverter and Sofar on the BMS? Correct
3. When selecting AoBo on the Inverter are there other variables that need to be changed from their default values on the Inverter?
4. When selecting Sofar on the BMS I changed Battery Rated Capacity from 150 to 200, are these changes in line with the necessary changes and are there other parameters that folk have changed?
5. Re 0.5c charging and discharging current I don't see values on the parameters to achieve this for calibration but I may well have missed them.
6. All other tips/issues gratefully accepted.

Something I can add is that if you position the BMS above the batteries and fairly central (I have the batteries in an old blanket box with the BMS on top on a plywood shelf) it is possible to utilise the wiring harnesses that come with the BMS without needing to extend it. Cables are around 72cms long.

Geeyfds53573

https://www.boards.ie/discussion/comment/118722015#Comment_118722015

1. Sounds correct to me. Should be between 3.55v to 3.65v when you finished charging.
2. Worked for a few here. I didn’t try other batteries as it also worked.
3. No it will ask you to fill in Overdischg SOC I think I set to 20%, ForceCharge SOC I think I set to 15%.
4. No mine once it ran a full charge discharge was fine apart from the error I mention above it seems to work great.
5. At 0.5c I couldn’t find a way either. No other tips be careful with the BMS so close to battery terminals but I like the clothes blanket idea.

reklamos

1. 16mV is fine
2. AoBo is the one that works. Make sure BMS CAN is set to Sofar
3. Default works fine
4. If your battries are 200Ah then this is correct
5. You can do this with timed charged/discharge. In there you can set charge/discharge Amps.
6. We are all still learning, keep folling this thread and also post your findings.

E30M3

Just wanted to check if I have the same S/W Version and Part number as other folk. Getting a 'BatName-Fail' message as soon as I connect with AoBo on the inverter and the BMS Set as above?

Software Ver on the inverter is 33001F.

I will move on to try other combos but wanted to check the obvious first. Thank you

Geeyfds53573

https://www.boards.ie/discussion/comment/118727776#Comment_118727776

340022 and read back here @reklamos is on 35 so prob not that

have you selected Sofar in the top right hand corner