Seplos CAN BUS RS485 48v 200A 8S-16S BMS

[_voltmeter_]

they are not the same price and are not rated for the same Amps. not same number of FET, not the same of terminal for BT B + and P+. terminal. Do you really expect them to be the same ;-)

my 150amp model
same number of fets same terminals

i know that the 100amp has less terminals and fets but what is the diffrence between 150 and 200?

 

[sergea]

wait, give me 2 minutes to open the box ;-)

 

[sergea]

yep almost identical with my 200A , I don't know if it is the same FET, can't read them ;-(

 

[_voltmeter_]

yep almost identical with my 200A , I don't know if it is the same FET, can't read them ;-(

can you make a close pictuer of your fets

i will dissasemble mine and take a closer picture

 

[sergea]

this is a RS485 model

 

[_voltmeter_]

this is a RS485 model

ah i see the fets are diffrent look at the soldered contacts

 

[sergea]

right ;-)

 

[Lt.Dan]

I asked Sol-Ark if they know if the communications with Seplos will work. Heres their response:

We do not have explicit CAN/RS485 comms with Seplos but we do have closed loop communication with Pylontech. Please note we do not offer support for comms with DIY batteries or batteries that are not on our list. To get closed loop comms, we work with the battery manufacturer to develop the protocol. The battery integration guide for Pylontech can be found at our website on the Support page.

Looks like an "idk". Lol

 

[sergea]

I asked Sol-Ark if they know if the communications with Seplos will work. Heres their response:



Looks like an "idk". Lol

Looks like "do whatever you want , we are not going to support anything not listed by us" fair enough. I think if you can afford sol-ark you should stick to their supported battery. At the same time they said we support pylon . So it may work with seplos since they have pylon emulation. But you are not going to get any support from sol ark with this configuration.

 

[Eddperk]

I have just built a battery cabinet with a Seplos BMS, powered up but I do not have a USB-485 interface yet. I understood that the Seplos shipped with the default Pylontech profile, but when connected to my Solis inverter, set to Pylontech battery it just reports Can-COMM fail. Same error in user defined battery mode.
Do I need to change settings in the Seplos software to make this work?
Hopefully the postman brings the interface soon…

 

[sergea]

I have just built a battery cabinet with a Seplos BMS, powered up but I do not have a USB-485 interface yet. I understood that the Seplos shipped with the default Pylontech profile, but when connected to my Solis inverter, set to Pylontech battery it just reports Can-COMM fail. Same error in user defined battery mode.
Do I need to change settings in the Seplos software to make this work?
Hopefully the postman brings the interface soon…

You probably need to build a specific CANBUS cable. you can't always use a standard straight/cross ethernet cable
seplos CAN port pins definition is CAN-L --> 4, CAN-H --> 5, GND --> 3,6. YOu need to get your inverter CAN port pin definition and wire the same pins name.


You need to calibrate your DIY battery to setup the capacity, or you can set it with their application and and usb/r485 cable.

 

[shavermcspud]

I have just built a battery cabinet with a Seplos BMS, powered up but I do not have a USB-485 interface yet. I understood that the Seplos shipped with the default Pylontech profile, but when connected to my Solis inverter, set to Pylontech battery it just reports Can-COMM fail. Same error in user defined battery mode.
Do I need to change settings in the Seplos software to make this work?
Hopefully the postman brings the interface soon…

It doesnt work with pylon for some reason, either chnage the inverter to default battery type, or change inverter to Aobo and change the BMS to Sofar

 

[Eddperk]

Thanks for the help, I can confirm that setting the BMS to Sofar and inverter to AoBo and it has magically sprung to life.

Next issue is that Solis cloud reports my daily energy usage and battery usage in the megawatts… does anyone else have this problem?

 

[peppebytes]

Axpert/ voltronic /mppsolar does NOT support CAN only RS485 !!!!

Ok but i have issue to set the 485 protocol, the command goes in timeout, some one have this?

 

[shavermcspud]

Ok but i have issue to set the 485 protocol, the command goes in timeout, some one have this?
View attachment 98437

This is probably because you have the canbus version on the Seplos BMS and not the RS485 version, they are two seperate units and not cross compatible

 

[peppebytes]

How can i change it?

 

[Lt.Dan]

How can i change it?

You have the send it back and exchange it, if they let you do an even exchange. If not, you'll have to buy a new one

 

[sergea]

Ok but i have issue to set the 485 protocol, the command goes in timeout, some one have this?
View attachment 98437

be very careful here, you can not switch from CAN to RS485 (and the other way) trying to do that could leave your BMS out of service, with the only choice to send it back to seplos to fix it.

 

[afakih]

i am having wierd issue with my seplos BMS 150A 16s. while the batteries are charging my SOC is decreasing and while discharging my SOC is increasing. can someone please assist with this.
Regards

 

[pedro54]

Hi, I’m new to this. I have built a 48v battery (16 x 304ah eve) and currently have a jk bms can (have also tried the rs485) but cannot get it to communicate with my SunSynk 8.8kw inverter. I’m thinking of buying a Seplos 200amp 16s.

Has anyone connected the Seplos to the SunSynk?
Should I be getting a RS485 or Can Seplos (do they do one with both)?
Would be easier and less expensive if I could get the JK to communicate with SunSynk anyone done this? ?

 

[sergea]

Choose CAN

 

[pedro54]

Got this reply from Seplos, regarding communication between SunSynk and Seplos

It should communicate with our BMS, but our tech staff can't be absolutely sure...

 

[sergea]

Sunsynk is a deye rebadge inverter. You can see on seplos yt channel they build a large solar installation with deye inverter and battery with seplos canbus bms. You have to select pylontech. Unless sunsynk specifically remove pylon support from their inverter it should work.

 

[crossy]

Just finished setting up my Seplos BMS (100A 16S LiFePO4) with my Sofar hybrid.

To my mild amazement it worked out of the box with the Sofar supplied cable and "General Lithium" selected as Battery Type.

I've not tried with "Pylon" as the battery type on the inverter yet, but since it's actually working ...

Anyone know if there's actually an advantage in setting the inverter to Pylon??

EDIT Whilst poking around in the BMS PC software I nocticed the "CAN" drop-down top right, one of the options is "Sofar" so I've selected that, no idea if it actually makes any difference.

Next task, make a cover for the delicate bits, it's all in a solid and reasonably well sealed box, but one can't be too careful

Active balancer not connected yet, let's see how things behave without it.

 

[shavermcspud]

You have the settings correct, General Lithium on the inverter and Sofar Can on the BMS. Good work btw

The only issue I can see there, is you have tied your active balancer leads in to the same single cable run as the BMS sense/balance leads.
This will cause you issues and throw random BMS warnings, had the same idea and it started to give issues.