VW ID4 82kWh HV Battery for Solar inverters (EU)

[Baterie18650.pl]

Hello everyone,

I would like to show You My new battery BMS project aimed at safer and better space efficient energy storage solutions using NMC car batteries and LFP "bricks".

I wanted to create all in one BMS that serves HV ESS for HV PV inverters. I have full Can communication using Pylontech CAN protocol. It works with Solis, Sofar, Deye, GoodWe inverters (tested) and all others that are compatible with Pylontech ESS.

It's based on NXP Daisy Chain architecture.

The main objectives we have had is :
- Remote access to battery from WWW (LinkCloud) and Home Assistant integration
- Plug and Play, standalone (PDU)
- Highest possible quality of components and overall design focused on safety and complying with EU regulations.

What we have created meet all those criteria and I can proudly present You something what I have called : LinkBMS

Quick specs :
7-14S Slave unit
30 Slave units per master
50A constant current load on PDU unit
CAN, Ethernet, WiFi, Screen, Cloud, Home Assistant, Standalone(self powered)

You can connect it to NMC 3.7V , LFP 3.2V, LTO 2.2V.

Here are some photos of this BMS in a 82kWh 96S battery build out of VW 8S3P LG modules:

I am the most proud of the Power delivery unit (PDU) which consists of :
- Precharge Resistor + Precharge Contactor
- Isolated voltage measuring unit with it's own start procedure (short protection and capacitor charging detection)
- TWO main contactors both for + and -
- Current sensor
- 800VDC 80A fuse
- M6 Terminals
- 1000VDC -> 12VDC Converter supplying power to Master Unit and powering the contactors

It's developed for 50A of continuous current and max 800VDC.

More info can be found on my site LinkBMS.eu

Would love to hear your thoughts and experiences, especially if anyone has worked on similar projects or has insights into the latest breakthroughs in BMS tech!

Looking forward to the discussion.

 

[DG98]

Impressive work! Can you share some screenshots of the configuration app, or (especially) the online monitoring piece? Those may not be fully developed yet, I don't know, but would be very interesting to many of us. I've waited years for Batrium to deliver the online monitoring they promised / sold, but it's clear now that it is never coming.

Perhaps in the future there is a way to adapt your system even for low-voltage folks -- which is most of the US market at this point in time.

Cheers, John

 

[Baterie18650.pl]

Impressive work! Can you share some screenshots of the configuration app, or (especially) the online monitoring piece? Those may not be fully developed yet, I don't know, but would be very interesting to many of us. I've waited years for Batrium to deliver the online monitoring they promised / sold, but it's clear now that it is never coming.

Perhaps in the future there is a way to adapt your system even for low-voltage folks -- which is most of the US market at this point in time.

Cheers, John

LinkBMS Cloud

LinkBMS Cloud

cloud.linkbms.eu

Here You are, You have only few devices that are for demo only, if You would buy the BMS than there will be all Your devices on Your accout.

 

[Baterie18650.pl]

We at first wanted to work with Batrium but they dont have cloudservice which is weird. They product also seems to look like a toy. Thats why we developed our own.

If You want to see but its in polish ... here is a Youtube Video describing the working principles.

View: https://youtu.be/B5iNLhBSkr8