Seplos BMS

E30M3

Tks for checking back there Geeyfds53573

, yes Sofar set on the BMS. I have whatsapp'd SEPLOS there also and asked for an OTA update freom Solis on the inverter to see where that gets me.

reklamos

https://www.boards.ie/discussion/comment/118729651#Comment_118729651

AoBo and Sofar should work. Try to change the battery in inverter to Pylon after saving setting you should see the alarm disapear for couple seconds and reappear again. Then change it back again to AoBo. Maybe inverter did not change the profile properly. I think HMI version 34 should be ok but your DSP version is 1F which is low. I have tried with 22 and 25 both work but 25 has some other issues. I see that @Geeyfds53573 also has 22 so maybe this is the cause if switching batteries does not work.

E30M3

Tks so much for taking the time reklamos I'll keep rooting but i appreciate your time and info.

Geeyfds53573

So I have had the “intermittent power supply waiting” warning at 100% SOC a few times now (Solis Hybrid) - If I discharge straight away then all is fine but if I’m away the Inverter falls over after a while which I don’t like - so I’ll contact Seplos now but wondering are there any suggestions as to a potential workaround anyone can think of?

@reklamos had you any luck with this one? Are Seplos helping in any way?

garo

How do you discharge straight away? By getting the Sofar to force discharge?

SD_DRACULA

https://www.boards.ie/discussion/comment/118742217#Comment_118742217

Is there any way to stop the charge at 98/99% if it does it at 100% only? Or would it do it then also?

Geeyfds53573

https://www.boards.ie/discussion/comment/118742380#Comment_118742380

Basically turn on Zappi or Eddie (Solis Hybrid) I’m assuming Sofar works fine - what is meant to happen at 100%? I assume the “intermittent Power Supply Waiting” is the problem

Geeyfds53573

https://www.boards.ie/discussion/comment/118742416#Comment_118742416

Yea kinda what I was thinking but no easy way that I know of

Jonathan

https://www.boards.ie/discussion/comment/118742217#Comment_118742217

I don't have a DIY battery but have noticed odd behaviour occasionally with my Solis Hybrid. When SOC is 100% it sometimes takes a while (could be 4-5mins) before inverter starts taking power from the battery to match house loads. Haven't noticed that behaviour when SOC <100%.

Is this what ye are seeing with your Solis Hybrids + Seplos?

Geeyfds53573

https://www.boards.ie/discussion/comment/118742588#Comment_118742588

for me at 100% Seplos reports “intermittent power supply waiting” and if left after a while the inverter reports a number of over voltage errors then shuts down - if discharged in time it’s fine but if 100% and still sun generation then it bombs out

Geeyfds53573

I assume Seplos should get to 100% no warnings then just standby waiting to discharge

garo

With my Growatt inverter, it refuses to discharge when the BMS gets the Intermittent Power Supply Waiting error. Either the inverter does not call for power or the BMS does not heed the call. I have had to manually set the battery capacity at a higher level so the BMS sees the battery at below 96% and then it starts behaving as normal. It's pretty annoying.

Geeyfds53573

mine has discharged fine @garo more than once after hitting 100% - might be limited for a few minutes but it does discharge - so is it a grid tied inverter related issue so? I thought from memory Growatt was well tested by Seplos so I’m surprised. If left does the Growatt inverter start to error?

garo

No I haven't got any errors. I gave it a couple of hours and it didn't start discharging. i contacted Seplos and they talked to the growatt engineer and got me to update the inverter firmware but still no joy.

Geeyfds53573

Interesting so your stuck in limbo that’s very strange - does it stay stuck on standby? so not the same issue as my concern is the inverter bombs out - if it didn’t I’d be fine - so the “intermittent… warning is standard functionality so maybe the export settings on the Solis might help

garo

Yeah the BMS stays stuck on standby so a different issue to yours. The inverter does not bomb out. At least I haven't seen it do anything. It also detect the battery as 100% full.

Geeyfds53573

Have you seen others with 100% issues? Outside of Ireland? Are Seplos still investigating your issue?

irishchris

Does this mean you are pulling from grid continuously until seplos is restarted? Seems massive issue that I hope not to encounter when I receive my cells.

Geeyfds53573

for me inverter bombs out (not pleasant) then all comes back online so no grid or nothing - the bomb out recovers and all seems fine - presumably it would continue in this cycle if I didn’t discharge

irishchris

When you say "bombs out" do you mean inverter restarts or what is happening?

This seems a deal breaker for seplos as otherwise defeats the purpose of having solar if production halts unless manual restart

championc

If you want to resolve issues, don't leave the problem to someone else. Engage with Seplos directly.

reklamos

I got onto seplos and they sound like they have never seen it before. I will need to record this problem and send the video to them.

Geeyfds53573

https://www.boards.ie/discussion/comment/118745638#Comment_118745638

Sorry if it appeared that way. I have indeed sent them details and will see what happens.

irishchris

Seems similar problems with the seplos BMS last September looking at this forum. Surely somebody reported it to them back then

https://diysolarforum.com/threads/growatt-sph4600-seplos-200a-16s-bms.27929/

SD_DRACULA

How about the solis guys try this to stop the battery from going to 100% by using the python modbus script?

if(soc >= 98)
  modbus.write_holding_register(register_addr=43141, value=0) # Set charge current to 0A
else
  modbus.write_holding_register(register_addr=43141, value=500) # Set charge current to 50A

Not sure if it will work in practice but in theory it should.

Bit of a hacky way to do it and it shouldn't be needed but could be a temp fix.

irishchris

https://www.boards.ie/discussion/comment/118749698#Comment_118749698

Don't suppose you know of any basic guide to modbus? Been years since ever did any coding and that would have been c++ back in the day

irishchris

Talked to seplos reseller and he reckons been using his with Solis for over a year without issues. Uses goodwe as the inverter make in the can menu of seplos as most similar to Solis. But he isn't sure what battery he has selected in Solis. Said he'd check when home tonight.

reklamos

The automation part will be last resort for me. I would like it to work independantly. The other thing is that once I connect my second battery I may never reach 100% but non the less I would like this to get resolved.

irishchris

Can anyone with seplos and Solis try selecting goodwe as inverter and aobo as battery. SEPLOS agent reckons that he has this combination working perfectly for over 12 months with no errors

E30M3

https://www.boards.ie/discussion/comment/118729876#Comment_118729876

Just to add to the what I can

I had Software Ver on my Solis inverter of 33001F and got the Batt-fail issue with Sofar and AoBo. I requested a S/W update on the Inverter from Solis (OTA 5G) and I now have

this now connects successfully without the Inverter shutting down and erroring out.

On the AoBo battery settings can I ask what people are using on the Solis Inverter for

'ForceCharge SOC'

ForceChg Limit'

and

'Overdischg SOC'

Tks

E30M3

https://www.boards.ie/discussion/comment/118752820#Comment_118752820

https://www.boards.ie/discussion/comment/118752820#Comment_118752820

Just had a look there Chris.

No Goodwe option to select on my Seplos. Growatt, Pylon, Victron, Sofar or Luxpower

reklamos

https://www.boards.ie/discussion/comment/118752942#Comment_118752942

Thanks for update. So your HMI version was updated. Looks like 34 had some bug. The interesting part is that your battery protocol is LG where as my is GCL. Now it could be because my inverter is 4G, but since the protocol is LG it could be that your inverter would also take LG as battery for seplos?

The 'ForceCharge SOC' and 'Overdischg SOC' are linked together. 'ForceCharge SOC' will always be lower than 'Overdischg SOC'. 'ForceChg Limit' will vary depending on BMS, battery and inverter.

The setting that I have are as follows, mind you I have backup load connected and I do reserve battery in case of power cut:

Overdischg SOC: 20%

ForceCharge SOC: 16%

ForceChg Limit: 20Amps

I've set these values because by default Seplos remaining capacity warning is at 16%. I just do not want it to start alarming. Also from what I've read these chinese cell should not go below 20% SOC. I was not letting any of my batteries below 20% even though pylons can go to 10% but that eats into cycles. ForceChg Limit: 20Amps equates to ~1kW and that is enough to bring it up required desired SOC. Yuo can go higher but for me low and slow is the way :)

Jonathan

https://www.boards.ie/discussion/comment/118752942#Comment_118752942

Anything new in that firmware? Last time I asked for a firmware upgrade, Solis support were a bit reluctant to do it without a good reason.

E30M3

https://www.boards.ie/discussion/comment/118754084#Comment_118754084

This is the 2nd firmware update I've requested via email and both done promptly with no Q's at all. Only thing I've noticed apart from the now successful pairing with the BMS is that there are some additional battery options but I haven't gone through them all but I can certainly check if someone has a q on a specific battery.

E30M3

Thanks for update. So your HMI version was updated. Looks like 34 had some bug. The interesting part is that your battery protocol is LG where as my is GCL. Now it could be because my inverter is 4G, but since the protocol is LG it could be that your inverter would also take LG as battery for seplos?

Tried LG and Sofar but Inverter errors out straight away. Haven't tried other combos as going to focus on trying to configure the Sofar/AoBo combo and see where I get to unless anyone needs another combo tried and I'm happy to check here

reklamos

Here is an idea how to house Seplos. I'm helping to setup battery for this person and he made a box for seplos out of postbox. I think it looks pretty good.

E30M3

I'm making progress with my Solis/Seplos combo

Couple of Pics in case they give anyone some ideas.

IMG_20220309_133141.jpg

LCD Screen in 3d Printed Case

IMG_20220309_133311.jpg

BMS on Plywood shelf on top of old blanket box that holds the batteries underneath, note I did not need to extend the BMS cables doing it this way so saved some work there.

IMG_20220309_133401.jpg

And again with other plywood in place

IMG_20220309_133413 (2).jpg

E30M3

Hope these pics aren't too large but I wanted to give as much detail as possible.

IMG_20220309_133421.jpg

Connection to the Inverter from the Battery.

IMG_20220309_133426.jpg

Shelf Brackets from Screwfix (Each rated to 100kg) overkill maybe but I wanted to be sure

IMG_20220309_133430.jpg

Overall pic, Inverter and battery are in a Boiler room as you can see.

E30M3

I have an issue I wanted to see if anyone else encountered.

BMS and Inverter are communicating but I am getting an erratic SOC. I had top balanced my batteries and the BMS showed them as almost fully charged. However when I connected them to the inverter they started to discharge briefly and then the SOC dropped immediately to 10% and gave a warning and the inverter started to charge. I detached the battery on the inverter as I wasn't sure if they could be inadvertently overcharged with the SOC all over the place.

When attached to inverter and briefly discharging.

and then drops and inverter starts charging

sorry for all the detail but should I let the inverter charge until cutoff or take a different approach here if anyone has had the same issue?

garo

https://www.boards.ie/discussion/comment/118748208#Comment_118748208

Yes I posted in that thread as well. I think this problem is unique to the Growatt Seplos combo. I intend to re-engage with the Seplos engineer again. Have been tied up for the past week. I did update the inverter firmware and that seems to have fixed issues I was seeing with the battery discharging to 0%.

garo

https://www.boards.ie/discussion/comment/118759429#Comment_118759429

Can you take a screenshot of the individual battery voltages? I can see the min and max and cannot imagine why the BMS would think the battery is at 10%. Did you charge to 100% and then discharge to shutoff to let the BMS learn capacity? If not, you may want to do that. In the current state, I would just manually up the SOC to 80% and let the battery discharge.

championc

@E30M3 Did you get the 10% when you first turned on ? If so, the first "switch on" SOC% can be haywire. The Seplos needs at least one full charge and discharge cycle to 'learn" your battery capacity.

So hopefully you told it to charge to 100% overnight last night. If you were graphing your SOC%, it quite likely jumped from about 30% directly to 100%.

You will also need to go through several cycles for your cell voltages to narrow. There's a huge gap between your highest and lowest.

reklamos

https://www.boards.ie/discussion/comment/118759429#Comment_118759429

The battery SOC deos not look right in first picture. Voltage 51.63V is too low for 100% SOC. Have you done full charge/discharge cycle at 0.5C?

E30M3

https://www.boards.ie/discussion/comment/118761114#Comment_118761114

What is the best way to do this at .5C? I had a look at the parameters but wasn't sure what to change to achieve this. Tks a million all.

championc

These cells will do 2c and higher I think. I think some people are overthinking this saving craic

puntypower

What's the difference between a seplos BMS and other BMS you can get on Aliexpress?

championc

https://www.boards.ie/discussion/comment/118765006#Comment_118765006

The Seplos appears to be the only one which can be connected directly to the inverter, by emulating (fooling the inverter into thinking) a connected Pylontech pack.

The AliExpress ones are standalone and the inverter then has to "guess" what the SOC% is constantly.

reklamos

https://www.boards.ie/discussion/comment/118764263#Comment_118764263

use timed charging/discharging and set amps in there.

https://www.boards.ie/discussion/comment/118764701#Comment_118764701

Sure they can do, I am just quoting what Seplos recommends doing to aquire proper SOC.

reklamos

Got my second pack connected today. Have now 2 batteries in parallel 1x master and 1x slave. The pack do communicate to each other and also balance out to keep the same voltage on both packs. The master is providing total SOC to Solis. My slave pack has not figured out its SOC correctly yet so even though both pack are at same voltage the SOC is different. Hopefully couple cycles will even them out.

On thing that does not work though is software. It can only see salve pack but not master. According to Seplos this is expected as you can have either PC connected or inverter which does not sound right to me. Anyway will keep on testing.

SD_DRACULA

I assume you have connected one seplos BMS to each pack? 16 cells per pack?

Interesting stuff especially for adding on cells at a later stage.