Communications issue Seplos V3.0 BMS to Solis RAI

[Alphonsox]

I am having a communication issue between my Seplos 280L with BMS 3.0 (v0.5 firmware) and my Solis RAI-3K-48ES-5G AC coupled inverter.
I have set the Inverter and the Battery to communicate using PYLON CAN protocol.
Although there is some sign of life the inverter shuts down with a BATNAME-FAIL error.

Has anyone got a similar system to work successfully ? If so with what protocol/firmware.
Thanks in advance

 

[SeaGal]

I am having a communication issue between my Seplos 280L with BMS 3.0 (v0.5 firmware) and my Solis RAI-3K-48ES-5G AC coupled inverter.
I have set the Inverter and the Battery to communicate using PYLON CAN protocol.
Although there is some sign of life the inverter shuts down with a BATNAME-FAIL error.

Has anyone got a similar system to work successfully ? If so with what protocol/firmware.
Thanks in advance

Welcome.

It sounds as though Seplos have not correctly implemented the Pylontech protocol. It is necessary for them to send CANBus Message ID 0x35E containing the following data.

0x35E: Manufacturer name ("PYLON ") = ASCII "PYLON" followed by 3 spaces.

If the Solis does not receive this message it will trigger the BATNAME failure condition.

If you can't get an update from Seplos, the it will be necessary to set the Solis to user-defined. Then it will accept standard SMA protocol, which is virtually the same, but without the battery name requirement.

 

[Alphonsox]

Thanks for the quick response. I'll give the "user defined" mode a go. Do I need to switch the battery to SMA ?

 

[SeaGal]

Thanks for the quick response. I'll give the "user defined" mode a go. Do I need to switch the battery to SMA ?

I suspect not, but no harm in trying. Sorry I can't be more specific; I have a Solis (in fact 2 of them), but have DIY battery, so not familiar with Seplos specifically.

 

[shavermcspud]

You cant use the Pylon protocol from Seplos to the Solis, Use either AoBo on the inverter of the default setting. The BMS will handle the rest.

 

[pfeva134]

You cant use the Pylon protocol from Seplos to the Solis, Use either AoBo on the inverter of the default setting. The BMS will handle the rest.

I'm having the same issue. AoBo on the inverted, but what settings should be on Seplos V3?

 

[shavermcspud]

I'm having the same issue. AoBo on the inverted, but what settings should be on Seplos V3?

The ver 3 has a Ginlong protocol already built in, GInong Solis is the official name of Solis
If changing via the BMS display its shown as RHI 3.6k

 

[pfeva134]

The ver 3 has a Ginlong protocol already built in, GInong Solis is the official name of Solis
If changing via the BMS display its shown as RHI 3.6k

Yes, it does indeed, but what battery type should I choose on inverter itself? I tried AoBo, but it doesn't work

 

[shavermcspud]

Yes, it does indeed, but what battery type should I choose on inverter itself? I tried AoBo, but it doesn't work

Default lithium on the inverter

 

[pfeva134]

Default lithium on the inverter

Thanks, that seem to work fine. I'll see overnight if it charges to 100%, because with self-defined it doesn't

 

[shavermcspud]

Thanks, that seem to work fine. I'll see overnight if it charges to 100%, because with self-defined it doesn't

If it doesn't charge to 100% then its not the inverter but the BMS settings. If you would like my Seplos V3 definition file I can send it to you, i have tweaked it just perfect for 16s and the solis. Just to add about night charge, is your charge window long enough for the 3.6kW inverters lower output?

 

[pfeva134]

If it doesn't charge to 100% then its not the inverter but the BMS settings. If you would like my Seplos V3 definition file I can send it to you, i have tweaked it just perfect for 16s and the solis. Just to add about night charge, is your charge window long enough for the 3.6kW inverters lower output?

Wow, that would be great! My window is 6 hours, so it sits on 98% for few hours overnight. I'm charging with 100A, but it is lower than that normally. Also, do you know if it is possible to do logging on BMS studio? I want to log per cell voltage as it charges and discharges.

 

[bolhuijo]

do you know if it is possible to do logging on BMS studio? I want to log per cell voltage as it charges and discharges.

Ooh I know! You can use the Real-Time Data function in the BMS Studio. Set the log interval using the slider to something longer than the 1 second default though - the storage size is limited. Then hit start record. Download the CSV file after.

 

[pfeva134]

Ooh I know! You can use the Real-Time Data function in the BMS Studio. Set the log interval using the slider to something longer than the 1 second default though - the storage size is limited. Then hit start record. Download the CSV file after.
View attachment 251440

Thank you so much, I couldn't figure out how to start recording! Didn't notice that top part changed when tab is selected

 

[pfeva134]

If it doesn't charge to 100% then its not the inverter but the BMS settings. If you would like my Seplos V3 definition file I can send it to you, i have tweaked it just perfect for 16s and the solis. Just to add about night charge, is your charge window long enough for the 3.6kW inverters lower output?

Thanks for the config, I've plotted voltages and it looks like some cells are unbalanced:


I saw active balancer did kick in, however it looks like voltage goes up so rapidly that it just hits over voltage too quickly

 

[SeaGal]

however it looks like voltage goes up so rapidly that it just hits over voltage too quickly

Suggest you reduce charge current as the SOC goes above 95% and reduce again once the first cell hits 3.4V and balancing starts (assuming you have correctly configured balancing point).

Also, I see you have a cell getting to 3.65V before charging stops. Whilst that voltage is fine for top balancing, it is not recommeded for regular charging. Charging to 3.45V or 3.5V should be sufficient for normal usage.

The voltages will rise very rapidly towards 3.65V.. The issue with the Solis is there is a minimum 4A charge current, so the voltages will always rise too rapid to give time for much balancing above about 3.55V IME. Hence recommendation to reduce charge current at a lower voltage and give the balancer time to do its job.

 

[pfeva134]

Suggest you reduce charge current as the SOC goes above 95% and reduce again once the first cell hits 3.4V and balancing starts (assuming you have correctly configured balancing point).

Also, I see you have a cell getting to 3.65V before charging stops. Whilst that voltage is fine for top balancing, it is not recommeded for regular charging. Charging to 3.45V or 3.5V should be sufficient for normal usage.

The voltages will rise very rapidly towards 3.65V.. The issue with the Solis is there is a minimum 4A charge current, so the voltages will always rise too rapid to give time for much balancing above about 3.55V IME. Hence recommendation to reduce charge current at a lower voltage and give the balancer time to do its job.

How do I do that on Solis, it has just one setting for charging current? On BMS side I've lowered charging request voltage to 57, going to see how that goes.

 

[SeaGal]

How do I do that on Solis, it has just one setting for charging current? On BMS side I've lowered charging request voltage to 57, going to see how that goes.

You don't do that via the Solis. The charge parameters, both voltage and current will come from the BMS - the Solis will simply respond to what the BMS requests over the CANBus comms port.

 

[pfeva134]

You don't do that via the Solis. The charge parameters, both voltage and current will come from the BMS - the Solis will simply respond to what the BMS requests over the CANBus comms port.

Ok, so 57v is probably still too high, going to try 56v. Balancer only starts over 3.4 and there is probably just not enough time. When high voltage alarm triggered, it starting to charge at 10A, is there a way to change it somewhere? I can't see this setting on BMS.

 

[SeaGal]

it starting to charge at 10A, is there a way to change it somewhere? I can't see this setting on BMS

I don't have Seplos, so no idea myself - hopefully someone on here will know.

 

[pfeva134]

Can anyone share how active balancer logic works on Seplos V3. I'm charging battery for last few hours with 1A and voltage delta is still increasing. Also it looks like even if button not pressed, bms studio showing balancing is active, but what is the button is for then?

 

[mjatkey]

Guys, I'm new to this forum have done most of my research on the Boards.ie forum.
I had an install done last week in an appartment so firstly no panels, just Seplos 280L with Solis 5K hybrid inverter.

It appears to be working ok, although I've not got it to charge to 100% SOC with 4 hour charge window and 100A charge.

I have the BMS configured to Ginlong and the Solis to user defined.

If some one on here has a set of tried and tested paramaters for both the Solis and the Seplos it would be much appreciated as so far there is a lot of conflicting views and opinions and the Seplos has so many configurable settings I'm afraid to make too many changes?

Thanks

Inverter settings, Seplos too many to add, so just what I think are the highlights

 

[SeaGal]

@mjatkey - welcome!

My 2p worth on the Solis side of things...

1) Battery capacity should be set to match the capacity of attached batteries; 280Ah presumably in your case?

2) The Solis's Discharge Depth setting makes no sense to me and I am not sure the Solis makes any use of it. The value should just be the difference between the 'Overcharge SOC' and 'OverDischarge SOC'.

3) It is the Overcharge SOC that stops the Solis charging when the battery reports it has reached that SOC. So, with yours set to 96% you will never achieve full charge. Suggest that value is set to 100%.

4) The OverDischarge SOC stops the Solis from using battery power to supply the AC Grid when the battery reaches that SOC, though note that the Solis will continue to draw approx 30W from the batteries to keep its electronics running when there is no solar DC input. 20% seems a bit high, IMHO, I'd set it to 15% instead. That will then leave enough charge to keep the Solis itself powered once it stops supplying the house load.

5) I would increase the voltage over and under limit protection values. These should never be reached and are only a secondary protection as the BMS will provide the first level protection in case of over or under voltage. But even the BMS's protection should never be hit because of the SOC monitoring for charge and discharge - mine have never been hit in over 2 years. I have my OVP set to 59V and UVP set to 46V on the Solis.

6) Charge and discharge current of 100A is correct for the 5kW and 6kW Solis S5 hybrid EH1P models. The BMS will chose a lower charge rate as it needs to - typically it will do that when SOC heads above 90%/95% and should reduce charge further once 99% or so is reached.

 

[shavermcspud]

As @SeaGal above has said is spot on.

 

[mjatkey]

Perfect, thanks guys will make some changes and see what happens.