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Seplos BMS

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Comments

  • Registered Users Posts: 437 ✭✭Geeyfds53573


    https://m.youtube.com/watch?v=66X1HzDpThg

    On this clip you can see the software flicking through the 4 packs this guy has. It that not what you should be seeing?



  • Registered Users, Registered Users 2 Posts: 793 ✭✭✭reklamos


    I seen this video. To be able to flick through he needed to change master pack id from 00 to 04 but then it is no longer a master pack.



  • Registered Users Posts: 16 Puitl


    Has anyone the same problems like I have? Wrote this to Victron Energy in the Victron-Forum:


    Everything works fine but before i write a short review here i have a questions, a issue and a problem:

    1)

    Seplos says they are sending the voltage of every single cell to the inverter but in the Controlpanel i can´t see them!?

    I guess this feature need´s programming on your side?

    Can you show them into the Panel?

    2)

    The DVCC-Function "Max. charge-voltage" works perfectly but the function "Max. charge-current" does only act when charging from the Multiplus.

    When charging from the MPPT´s this function does nothing.

    According to the desccription in the Cerbo-GX manual this function should control the max. charge-current from all inverter/chargers AND all MPPT´s.

    Whats wrong here?

    3)

    The Seplos sends a max. charge current limit (CCL) of 10A when a cell exceeds 3,5V.

    In the attached picture you can see that the Systems recognize this but doesn´t react:

    CCL is set on 10A but the ESS is charging with full power from the MPPT´s until the BMS cuts of.

    Also: Whats wrong here? Is it a software problem or do i only have to adjust a setting?

    (I guess Problem 2) and 3) have the same "root"...)




  • Registered Users Posts: 47 optip


    Not sure if this is helpful - but I have a Victron system with BYD CAN battery that behaves correctly when charging from MPPT. (kinda similar to what you're shooting for)

    below are my settings for the MPPT / Networked Operation settings - can you check if yours are similar? especially the 'Mode Setting' of 'Ext. Control & BMS'. This requires a ve.direct cable from the Venus device to the MPPT to work - I can't tell from your VRM screenshot if the MPPT is detected (& sorry if that's overly basic troubleshooting! 😀)

    I'll be upgrading to a Seplos BMS based battery in the coming months - I very much hope the victron-seplos combo behaves for you :)



  • Registered Users Posts: 16 Puitl


    Hi!

    My settings in this menu are exactly the same as yours!

    What is very strange:

    When i set CVL (in DVCC-menu) to 55V or 54V, the "charge voltage" of the MPPT goes down to 55,4V / 54,4V (in MPPT / Networked Operation settings).

    (0,4V higher because of cable-voltage-lost i think....wherever i can set these value because i noticed that 0,2V will be more appropriate at my system)

    -> So CVL does act in the MPPTs but only CCL does not


    I have no idea why and on Victron Forum (Victron community) i don´t get an answer...



  • Registered Users Posts: 16 Puitl


    With pulling up the following thread i get to the answer why it doesn´t work:

    (Can´t post links here, just search on google for:

    "BUG in ESS - DC Feed-in enabled, Charge Current Limit (CCL) from BMS ignored"

    Short summary:

    Victron cannot reduce the charge current when charging from the solar chargers because of the risk of destabalize the system.

    They recommend to reduce the end of charge-voltage (CVL) when single cell-voltages are getting to high.


    @optip Does your BYD really reducing the CCL and you can watch this in MPPT / Networked Operation settings or does it mybe also reduce the CVL?



  • Registered Users Posts: 47 optip


    my battery is around 100% currently, filled by the MPPT/sushine... here is a screenshot of my parameters while at 100% soc

    when the battery gets full, the MPPT continues to generate power - but the inverter sends it to the grid rather than letting it go to the battery.

    I haven't been able to see a limit reflected in the MPPT itself similar to the CCL, but controlled by the GX.

    A fallback option I am considering for myself is to use basic voltage settings to configure the battery rather than CAN connection. Might be useful while troubleshooting the CAN connection. Longer term I'm hoping to use CAN to control low temp charging properly.



  • Registered Users Posts: 16 Puitl


    Haha 🤪 strange strange strange

    and reducing max. charge current in the DVCC-menu while MPPT´s are loading the battery with full power does also work at your byd-system?



  • Registered Users Posts: 47 optip


    I currently have a manual 60A DVCC limit configured because my baseload went down leaving too much solar excess for my (small) battery. Without that limit, my battery throws alerts relating to over-current.

    I'll set it to 20A tomorrow (assuming sunshine) to confirm it works properly - i.e. that the MPPT adjusts it power to baseload + 20A for the battery



  • Registered Users Posts: 16 Puitl


    Yes pleace test it because in the victron-thread i asked yesterday why this works with your BYD and i get following answer:

    "the Victron system works the same with BYD, BYD lowers CVL when battery full. But if you take a small BYD battery and big MPPT's, combined with too little feed-in capacity, it will also charge more current than asked."

    When you turn it down to 20A please look into the MPPT / Networked Operation settings and have a look: The MPPT charge-current must then also be lower here.



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  • Registered Users Posts: 47 optip


    test complete

    while the sun was shining and charging the battery with 30A+, I set the DVCC limit to 10A. This had no effect - the MPPT kept charging at full speed until the battery approached 100% and then the mppt dialled back the power.

    I suspect that setting will affect the Multiplus charging the battery from grid - I can test that tonight if that's helpful.



  • Registered Users Posts: 47 optip



    "When you turn it down to 20A please look into the MPPT / Networked Operation settings and have a look: The MPPT charge-current must then also be lower here."

    Sorry - I didn't specifically check this and now my battery is 100% so I can't check again until a good cloud comes through.



  • Registered Users Posts: 16 Puitl


    Then tomorrow after this discharging-night when the sun powers down ☺️



  • Registered Users Posts: 47 optip


    the sun hid for long enough for the test :)

    this parameters screen seems to ignore the 10A limit set under DVCC



  • Registered Users Posts: 16 Puitl


    Ok then it´s the same at your system, everthing else would be strange^^

    BMS-CCL and "Max. charge current" has no or almost no influence on the System (only when charging from grid with the Multiplus) because it is technically not possible to reduce charge-current when there is PV-power comming in and CVL has not be reached.

    The only way to reduce charge-current is to set down CVL - your BYD seems to do it, the Seplos do it not (maybe with an update because i wrote them that it makes sense 😁)



  • Registered Users Posts: 47 optip


    sorry I couldn't be more help!

    please let me know how you get on with this... I already have a Seplos BMS with cells still in transit. Seems likely I'll have a similar issue to yourself.



  • Registered Users Posts: 16 Puitl


    You helped a lot!

    One thing that would be nice to know if the BYD-battery really reduces CVL when for example on cell gets over a voltage-limit, but then you have to disbalance one cell 😅

    For me it is no problem when this safety-feature don´t work with the seplos because I only charge up to 55,2V (3,45V per cell) - so I protect my battery and I will skip the last few Ah of the capacity.

    Once or twice a year I will charge the battery full and then slowly go up with the voltage to 3,55V or 3,60V per cell to do a clean top-balance and "update" the real SOC



  • Registered Users, Registered Users 2 Posts: 3,239 ✭✭✭irishchris





  • Registered Users Posts: 74 ✭✭puntypower


    Where is the best place to buy one of these now? Just about to pull the trigger and buy batteries from oye too.



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  • Registered Users, Registered Users 2 Posts: 3,239 ✭✭✭irishchris


    Yes that's the Ali store I bought mine from also. Went with the 150A version as my system will be doing 100a discharge.



  • Registered Users, Registered Users 2 Posts: 418 ✭✭munsterfan2


    Hi,

    Quick question, for connecting the BMS cables to the battery terminals is it easiest / best to use crimped cable lugs ? Screws are M8, what thickness are the wires. ? Would these be suitable, "RS PRO Insulated Ring Terminal, M8 Stud Size, 1.5mm² to 2.5mm² Wire Size, Blue" ?


    Thanks,



  • Registered Users, Registered Users 2 Posts: 793 ✭✭✭reklamos




  • Registered Users Posts: 47 optip


    I purchased from there.

    Arrived no problem in a couple of weeks - with approx €5 customs charge.

    I haven't hooked mine up yet (still waiting for cells) and one concern I do have about 'Minerals Store' is what the support will be like if I need help or firmware updates, etc. Some people have gotten support from Seplos - I'm not sure if that's tied to buying direct from them.



  • Registered Users Posts: 74 ✭✭puntypower


    I'll be getting the 200a pack. 3.2v 200AH Lifepo4 Rechargeable 16Pcs 12v 24v 36v 48v Battery Pack Lithium Iron Phosphate Solar Cell 12V 24V 48V Solar System

    Would the 200a BMS be sufficient or go up a size?



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  • Registered Users, Registered Users 2 Posts: 793 ✭✭✭reklamos


    Size your BMS depending on your inverter charge/discharge rate. 200Amp BMS means that it can charge at 200Amps. I have yet to see inverter that can do that. Majority now can charge at 100Amps so 150Amp BMS is more than enough. Check your inverter manual.



  • Registered Users Posts: 16 Puitl


    I bought mine directly from Seplos, Support was great.

    I had a few technical questions and I was invited in a Whatsapp-Group with the technicians - I was able to clarify all there.



  • Registered Users Posts: 16 Puitl


    When charging (discharging) to the value of "Total high (low) voltage alarm" the Seplos is setting the SOC to 100% (0%).

    With charging/discharging to this voltages you can "reset" the SOC when your packs are connected parallel.

    Second option is to set the actual SOC in the parameters and upload the new settings to the BMS....i don´t know exactly how this parameter was called exactly (can check it in the evening).



  • Registered Users, Registered Users 2 Posts: 418 ✭✭munsterfan2


    Hi,

    How/where did you request the Solis firmware update. I am on 270014 and dont have option of AoBo battery.


    Thanks,



  • Registered Users Posts: 325 ✭✭E30M3


    Send an e-mail to euservice@solisinverters.com stating your inverter is online and quoting the serial number and requesting it be updated to the latesst firmware.



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  • Registered Users, Registered Users 2 Posts: 3,239 ✭✭✭irishchris


    Just wondering if those with Solis inverters manager to get over the teething problems with the seplos and their inverter. Or are there still issues and warnings on it? Mine are due in couple weeks so hoping all is good 😃



  • Registered Users, Registered Users 2 Posts: 418 ✭✭munsterfan2


    I'm still having issues, requested an updated firmware from solis, ticket created on site a few days ago but no action since. I did come across this article https://solis-service.solisinverters.com/support/solutions/articles/44002136179-solis-hybrid-inverter-battery-name-fail-batnamefail which suggests it's also an error that occurs when stacked packs are not wired correctly. Not sure how that would be the case with 1 BMS.

    Can they do OTA updates on RHI-3K-48ES or do I need to go looking for firmware update stick ?



  • Registered Users, Registered Users 2 Posts: 418 ✭✭munsterfan2


    Hi, I emailed that address and a ticket got auto-created. No action on ticket, aside form me, still unassigned. Anyone any other suggestions, contacts - did anyone call the number on the site. Worried I will be stuck with battery not working



  • Registered Users Posts: 325 ✭✭E30M3


    That's how I've received 2 updates, I haven't had to do anything else. Hope it gets resolved over the next few days



  • Registered Users, Registered Users 2 Posts: 418 ✭✭munsterfan2


    Called the number on their site and got talking to a support engineer, she was really helpful and had my firmware updated in a few hours. Running now at 5amps, to charge / discharge to get the BMS cailbrated

    Thanks for all the help everyone



  • Registered Users, Registered Users 2 Posts: 3,239 ✭✭✭irishchris


    Nice one, delighted you got it sorted and updated 👍



  • Registered Users, Registered Users 2 Posts: 793 ✭✭✭reklamos


    Bump it up to more than 5Amps. It will calibrate at 5Amps but will take a while. Seplos recommends calibrate at 0.5C which for 200Ah battery is 100Amps. You do not need to go that high but do at least 1kW which is ~20Amps.



  • Registered Users, Registered Users 2 Posts: 418 ✭✭munsterfan2


    Hi,

    Quick question, getting the same issue as E30M3 in that the BMS starts discharging, drops to 10% SOC then starts charging and jumps fairly quickly to 100% SOC.


    To manually charge to 100% do I set to a different battery type on the inverter ( Currently AOBO ) ? and charge to fail, then change discharge time and discharge to fail ?



  • Registered Users, Registered Users 2 Posts: 1,874 ✭✭✭garo


    Looks like your cells are not balanced and/or you need to change the Seplos Overvoltage protection settings. Can you manually set remaining capacity to 180, let it start charging and then take a screenshot. Most likely one of your cells is hitting the monomer overvoltage protection.



  • Registered Users Posts: 16 Puitl


    Show us your protection settings! What cells do you have?

    I will write something about the Seplos later. I´ve tested it now and have written a lot with a technician from Seplos:

    The hardware and the functions are good and working for a really good price, but the software is bad.

    Seplos is doing wrong thinks with the parameters and what they are doing with the CVL respectively how they interpret it is simply wrong...



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  • Registered Users, Registered Users 2 Posts: 1,874 ✭✭✭garo


    I would be interested to know where you think the software is doing wrong things as I disagree with that. I think their documentation is poor and it is not immediately clear what each setting is for but once you get it, you can get the BMS to do what you want. It's not perfect - and there is some unevenness around inverter support - there is a weird problem with my Growatt BMS for example.



  • Registered Users Posts: 16 Puitl


    There are four relevant parameters in the software which can set:

    -Monomer high voltage alarm & protection (cell)

    -Total high voltage alarm & protection (battery)

    At "monomer high voltage alarm" the BMS sends a CCL of 10A - no control after that if that could be enough. If it is still to much the cell goes up to 3,65V (= monomer high voltage protection) and BMS cuts out - thats not a drama but also not the fine-way ;)

    At "total high voltage alarm" the BMS sends a CCL of 0A and is setting the SOC to 100% - so charging ends up here without gradual current reduction!

    At "total high voltage protection" the BMS cuts out - BUT: They are sending THIS VALUE also as CVL to the Inverter!


    So the goal for the inverter (=CVL) is the same value at which the BMS cuts out - but anyway it will never reach it because at "THV-alarm" he gets the signal CCL = 0A! That doesn´t make sense to me.

    This regulation is really bad when you have a Victron-System because Victron can NOT react to the CCL when charging from the MPPTs/Solar (CCL has only a effect when charging from the grid with the Multiplus or when grid feed-in is disabled)! So whats happening at Victron:

    When a single cell-voltage is getting too high the BMS can only act when it reaches the protection-value (3,65) - cut out!

    Because CCL is "disabled" the inverter charges up to CVL (= protection-value!) and would then go down with the current step by step - he would but its not possible because - cut out! 😃


    So what´s left for me: A stupid BMS with a better SOC-calibration (compared to a BMS without communication and no installed BMV), a Display where i can see the cell voltages and a software with the function to record data in liftime...

    I hope this whole thing applies only to me and my BMS, otherwise i cannot understand why I´m the only one who´s criticizing this 😄

    (REC for example is doing it perfect - but it´s so expensive :/ )



  • Registered Users, Registered Users 2 Posts: 418 ✭✭munsterfan2


    Hi,

    Have batteries hooked up to a bench charger to top balance. It did appear to be on cell which was shooting up. Will take a few days to balance and reconnect. Hopefully I will get to it at the weekend (bloody work getting in the way) and update then.



  • Moderators, Home & Garden Moderators Posts: 6,430 Mod ✭✭✭✭graememk


    Do you have them in parallel or in series on the bench power supply?

    They should be in parallel, and charging at 3.65V A cell shouldnt be shooting up in that configuration.



  • Registered Users, Registered Users 2 Posts: 418 ✭✭munsterfan2


    They were in series on the VMS / inverter which was whenthe cell was shooting up, Now in parallell on bench charger, Currently charging to 3.5, will then charge to 3.65. Doing in blocks of 8



  • Registered Users, Registered Users 2 Posts: 1,874 ✭✭✭garo


    Thanks for the detailed reply. Yes it looks like it doesn't play well with your Victron. I have an issue with my Growatt too. When it gets to 100% the BMS/inverter refuse to discharge the battery and stay stuck until I change the SOC using the software which allows the discharge to start.

    I'm surprised that at "total high voltage alarm" the BMS sends a CCL of 0A and sets the SOC to 100%. I thought it was doing the same as at "monomer high voltage alarm". It would make sense to send a CCL of 10A at that point and only set to 100% when it hits total high voltage protection.

    Out of curiosity how were you able to determine what was being sent out by the inverter? Do you sniff the CAN packets?



  • Registered Users Posts: 16 Puitl


    What´s little bit strange: Seplos told me that thay are setting SOC to 0/100% with "total low/high voltage alarm" and i could watch it the first time i was testing it. When i do it now the SOC goes to ~97-99% so it seems that there is also a other parameter which is influencing that...

    About my "sniffing": The only parameters for the BMS for controlling a inverter is CCL & CVL (...at Victron actually only CVL). I would be suprised if other inverter would respond to more BMS-parameters...So what i did do find that out:

    1) I was playing around with the parameters in the BMS Software a little bit and in the victron system i can see the CCL- & CVL-values the system gets from the BMS at the same time.

    2) In the victron-system i can manually set down the "max. charge voltage" (=CVL) in 0,1V steps (only lower than the value from BMS is possible). So i was setting this lower than the first BMS alarm-threshold and then i turned it up step by step with an eye on the cell- and total-voltage, the BMS-Alarms/Warnings (live in the Software), the CCL/CVL-values the BMS was sending to the Inverter and the charge-current from the inverter.

    After that i chatted with Seplos about all that because i could not understand why the BMS was acting like this...what should i say...i´m a little bit sad and confused. They write really good in english and i was explaining it clearly but it seems like they don´t really know how to charge Li-cells. It seems like "hay we have a good hardware for good price but no good software-engineer which know´s how to charge Li-cells correctly...ok then let us stop the charge when the battery is mostly full" 😅

    I also made 2 offers until now but there seems now interest to improve the software...I think they still don't understand what they're doing wrong..

    I wrote with REC, they are doing it perfect (also in combination with victron) and i think Batrium will do it also perfect, but a haven´t time until now to reed all the manuals^^



  • Registered Users, Registered Users 2 Posts: 793 ✭✭✭reklamos


    I agree that there is room for improvement on software side, especially at low and high end. Everytime BMS hits both sides it recalculates SOC and that throws things off. Instead off setting CCL to 10A when threshold is hit, I'd prefer it to actually start lowering Amps gradually at certain voltage. This would ensure that the cells are kept in balance as they tend to start run away from each other at the bottom or the top. I am still playing with my settings but I think I have it close to where I want them to be. The next task is to read values from BMS so I can move some logic outside of it.



  • Registered Users Posts: 16 Puitl


    There is room yes^^....it is not really dangerous for the Pack because the BMS cuts off at least but in view of charging Li-cells correctly it is simply wrong what they are doing.

    I have the solution for Seplos but there is no interest until now for improvements respectively to just do it right. Next week i will ask a last one, I´m curious if i will get an answer.

    The SOC-calibrating to 0/100% is the smallest "problem" here and would be also solved with my solution.....



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  • Registered Users, Registered Users 2 Posts: 3,419 ✭✭✭randombar


    Any videos about on how to set up the seplos with the batteries we've all bought from Ali recently?



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