Hardware interface - now for sale

[Uksa007]

Hi,

This has all the hardware needed to communicate with BMS and Inverter over CAN bus.
Hand built on a PCB and soldered to the ESP32, bulletproof design for production use.
Don't use modules and Dupont connectors for long term production use, they are for proof of concept and prototyping only, and are prone to fail.

It is a plug and play device, just add power (5v USB)
New DCDC version powered direct from the JK-BMS, with fuse.

Provides all the hardware needed to connect the JK-BMS to Inverter
Fully tested Plug and Play, connect to JK-BMS with the supplied 4 pin cable, plug in RJ45 Inverter cable and supply power with the supplied USB cable.

Kit will consist of:

• ESP32 Development board
  • Latest Firmware installed with:
  • Captive portal AP to connect to existing WiFi network
  • Standalone AP mode mode
  • Web server for standalone management
  • Home Assistant integration
• CAN interface PCB board with:
  • CAN bus transceiver high quality Texas Instruments native 3.3v
  • CAN bus termination selectable with solder jumper, on by default.
  • RJ45 CAN bus connector for Inverter, standard wiring for direct inverter connection pin 4H, 5L
  • JK-BMS 4 pin interface connector
• JK-BMS 4 pin cable supplied
• USB Cable supplied for power and data (only for non DCDC version)

These are the default setting, which should be good for 16s LiFePO4, let me know if you need something different:

• charge_a: "50" (Max charge current)
• absorption_v: "55.2" (Charge V, 3.45V/cell)
• absorption_time: "30" (Time to absorb)
• rebulk_offset: "2.5" (absorption_v - rebulk_offset = charge request)
• discharge_a: "100" (Max discharge current)
• min_dischange_v: "48" (Min discharge V, 3V/cell)
• force_chg_v: "44" (V must charge, 2.75/cell)

ORDERING
There is limited supply and they are labour intensive to make, so I will be offering them to supporters of the project on Patreon, with a discount.

Consider supporting the project and become a Patreon member, benefit from: discounted hardware and dedicated one on one support, and much more.
Purchase here

Which JK BMS should I order, you should order this model:

I would recommend the 200A model B2A20S20P if you are planning on constant change/discharge of 150A, better to have a little head room.
This model has a 2A active balancer and 8-20S LiFePO4
You have to click view more and select the correct model, Note model is the Color:
Work in progress to support the new inverter style Jk-BMS, see here for supported devices.

[Uksa007]

Hardware interface now available, limited number, register your interest at Patreon

Provides all the hardware needed to connect the JK-BMS to Inverter
Fully tested Plug and Play, connect to JK-BMS with the supplied 4 pin cable, plug in RJ45 Inverter cable and supply power with the supplied USB cable.

Kit will consist of:

• ESP32 Development board
  • Latest Firmware installed with:
  • Captive portal AP to connect to existing WiFi network
  • Standalone AP mode mode
  • Web server for standalone management
  • Home Assistant integration
• CAN interface PCB board with:
  • CAN bus transceiver high quality Texas Instruments native 3.3v
  • CAN bus termination selectable with solder jumper, on by default.
  • RJ45 CAN bus connector for Inverter, standard wiring for direct inverter connection pin 4H, 5L
  • JK-BMS 4 pin interface connector
• JK-BMS 4 pin cable supplied
• USB Cable supplied for power and data

[Highlife5150]

Ap21S002

[Highlife5150]

https://batteryhookup.com/products/7s-21s-24v-75v-300a-lithium-ion-bms

[Highlife5150]

For lithium iron 3.2v

[RicardoJMG]

Hello i have many vision batteries... with no acess to bms data. Can this solve ?

[trippfam07]

Is it possible for me to build the boards myself?

[torsteinelv]

Send one to me and i will add a 3d printed design to it.

[Uksa007]

Thanks but at this stage i only have enough stock to supply Patreon members orders.

[copaedition3]

Hola qué precio tiene la PCB o el kit? Siendo
de patreon

[Uksa007]

Hello, Is this JK 2 Can (Deye 5k-sg03lp1-eu i ned them for) ready to use without solder and flashed software and an manual to config it for my wifi?

Hi,
Yes others are using it with that inverter, the device is plug and play, just add USB power.
The device has wifi for monitoring and some configuration most of the configuration is done when I flash the firmware using the setting you specify or the default for 16s 280 AH LiFeP04
There is a manual.
Shipping time to the EU (8-12 business days) once shipped.
Purchase via the above patreon link, you will need to be Pateron member to order.

[Uksa007]

thank you, its a cool projekt but its difficult to get them to austria.

It is easy to send them to Austria, I frequently post them to many EU countries.
Paypal purchase link is on the bottom of this Patreon page, you will need to be a supporting member to access it.
https://www.patreon.com/posts/jk-bms-interface-82923237

[Uksa007]

Update: now available with two RJ45 with Termination disabled for Multi BMS use.
Multi-BMS code currently available for Patreon Alpha testers members.

[torsteinelv]

How do you wire these? Are they powered from the battery? Or poe?

[Uksa007]

The plug and play option is to power them via the included USB cable (supply your own USB power adaptor or use a USB port on the inverter or nearby device, I use a nearby Raspberry Pi USB port).
There are more advanced DIY options like use a small 60v to 5v DC to DC converter to power them from the battey.

They are NOT POE as they are not Ethernet devices the RJ45 is used for the CAN bus connection to the inverter.

[paulsteigel]

Why don't you use a DC-DC buck converter to power the ESP, this will be good for packing everything in one package. Can you also be so kind to share the schematic for us?
A good converter is here!
https://oshwlab.com/Little_Arc/LM2596
Best!

[Uksa007]

I'm currently testing a new interface board I have designed with a built-in DC-DC converter and protection fuse.
It will be available for sale soon.

[ulli1961]

Hello Uksa007,
my highest respect! You have developed a plug and play device that for many offers a significant improvement in monitoring and, if I understand correctly, does not require any additional devices for communication between the JKBMS and a Deye inverter.

We have a DIY pv system using a Deye Sun-12K-SG04LP3-EU and a 16s 302Ah LiFePo4 battery with a JKBMS.
For me, the most important thing is to tell the inverter the real SOC of the JKBMS, so that I can get away from controlling the battery via the voltage.
Actually, I was already very ambitious to rebuild the device, but I'm already failing on basic things like finding a suitable and safe transceiver board.
I would like to purchase one of your devices. What should I do?

[Uksa007]

Hi,

The link and info is in the the first post, follow the link and become a Patreon member, and then you will be able see the Pateron post linked and order from there.

There is limited supply and are labour intensive to make, so I will be offering them to supporters of the project on Patreon, consider supporting.

Regards

[Lieberkind72]

Hi,

what devices are needed when I have 2 bms ?

[Uksa007]

You would need 1 * master and 1 * slave.
I can put a kit together if you like if you are not a Pateron Alpha tester.
Multi JK-BMS kit for non patreon Alpha tester members, consists of 1 Master and 1 Slave will allow 2 JK-BMS to be connected to one inverter.

[kmoreau893]

I have 3 Overkill 100A BMSs, one for each of a 280ah 16s systems, what do I need to plug them into Sol-Ark 12K or 15K and can I sign up as a patreon member for you and get a discount?

[Uksa007]

Hi,

I have not yet adapted the Multi-BMS code to support the Overkill BMS, as there has been no Alpha testers members using the Overkill BMS, they have all been JK-BMS users.
Having said that it's probably a couple of days effort to implement it.

The Multi BMS code/solution is available for Alpha testers members, so you would need to subscribe to that level of membership.

I would probably start by ordering the Standalone BMS and give it a good test with the overkill, there hasn't been a lot of overkill users so would be good to test it more thoroughly before I add the Multi-BMS support.
The standalone hardware can be reused in the multi-bms solution with a reflash.

Regards

[kmoreau893]

Thanks for the reply. I've put a similar question in the Patreon account, I joined at the minimum level. Would you be able to go there and respond to those purchase related questions please? I'll help you troubleshoot Overkill BMS issues if they arise. Thank you. -Keith

[kmoreau893]

Btw I'm Patreon member "TechMove". Thank you. -Keith

[vicdat]

Hello Uksa007, i would like to now if your kit has been matched with a Goodwe et series inverter. Thanks

[Uksa007]

Hi,

The Goodwe ET series is a High voltage inverter, there is no JK-BMS that could support the number of cells and the high voltage required.
What are you planning on using for a BMS?

I also think the HV protocol may be different.

[vicdat]

I was thinking a Batrium bms setup

[Uksa007]

HV gets expensive and dangerous, I would just use the Goodwe HV batteries.
If you want to use DIY batteries you should use a LV inverter.
Regards

[vicdat]

Thank you for the quick response

[Spacejunki]

Hi, I have a Sofar HYD6000ES inverter, with a Lithium Ion battery (in 14S configuration).

With the following information, would you be able to customise the interface to suit?

Also, I presume there's no work our end, other than plugging in and setting up the inverter in the correct mode etc.

Max Charge: 60amp
Max Voltage: 58.5V
30 min Absorption
Rebulk: 2V
Max Discharge: 70A
Min Discharge Voltage: 44.8
Force Charge 43V

Thanks

[Uksa007]

Hi,
Yes that should be no problem, assuming you are using a JK-BMS?
There are several people using 14s Li-ion with my interface.
It should be plug and play just add power via the included USB cable, and connect and configure the inverter.
Regards

[Spacejunki]

Yes, using JK-BMS. It's a JK-B2A24S15P, V10. So I believe it suits your setup.
Awesome, thanks. I will organise an order through Patreon then, thanks for all your hard work on this one!

[Uksa007]

Yes, using JK-BMS. It's a JK-B2A24S15P, V10. So I believe it suits your setup.

That's the same model Jk-BMS that I'm using so you should good!

[smeestu]

Hi i would like to know if your unit will work between my deye Sun-5k-SG05LP1-EU hybrid inverter
and 48v 200a/h battery with JK BMS in the pictures below .
And if so price and how to order im in Thailand thanks

[Uksa007]

My interface is designed to be connected directly into the BMS without using the JK RS485 adaptor.
You would need to remove the Jk RS485 adaptor, and plug my interface into the BMS or add your own RS485 to 3v3 TTL adaptor.

Ordering info is at the top of this page #16

[vietxtlife]

Hi Uksa007,
I have an Pow mr 5000w inverter and 2 24v jk bms. I want to buy an interface for them, thank you

[ans-gw]

Hi Uksa007,
I m going to have a new MppSolar Max 11Kw soon..
.and i would like to buy your board.I see Max 11 support Rs485 and Can by Bms port.
I have already a Jk Bms B2A24S20P HW:V10.XG,SOFTWARE.10.08.
Can this working Ok.?
Can you send to Thailand?

Thank you

[Uksa007]

Hi,

Sorry No BLE support, I made a design decision that the Interface is for Inverter comms first(not BMS configuration), and forms part of the safety system, sending alarms and charge information with the inverter.
BLE is not robust enough for such a system.

The BMS manufacturer provides the configuration app for the BMS.
Once the BMS is setup you should not need to use their app again, all the controls and information for the inverter are controlled via my board.

See more info here

[paulsteigel]

Hi Uksa007,
Thanks for your quick response! I understand your point, but I don't not means to reiterate the Bluetooth App but I mean is it possible to use the Bluetooth connection to grasp data from BMS rather than using the JST 1.25mm bus for connecting to UART terminal on JK-BMS. This is because ESP32 will be placed very close to JKBMS.
If yes, that would be great then.
Best
Ngoc!

[Uksa007]

Sorry No Bluetooth support, I made a design decision that my Interface kit is for Inverter comms first and forms part of the safety system, sending alarms and charge information with the inverter.

Bluetooth is not robust enough for such a system.

Bluetooth uses 2.4Ghz the same set of frequencies that are used for WiFi and microwaves.
It is inherently unreliable, if the connection is lost or data is corrupted due to interference, the CAN data sent to the inverter is compromised.
CAN data is sent to the inverter every 1 second, so you have to ensure the data from the BMS is reliable, the only way to do that is to use a Serial cable connection.

Commercial batteries do not use Bluetooth in the connection from BMS to the Inverter and for good reason, it would be a poor design.

You gain nothing that is required for the inverter CAN comms by using Bluetooth apart from being unreliable.

[paulsteigel]

Hi Uksa007,
Many thanks for you clarification! I would be happy to move on with your suggestion anyhow (some of my friend asking about this). One more point to go, I saw your very smart walkaround to control charge/discharge over CAN bus:

UART control is read only for controlling the BMS.

Cheer,
Great thanks for all your response!
Ngoc

[Uksa007]

There there is much charging and discharge logic that sends control information to the inverter, for many different scenarios.

[giangy11]

Hi, does it work with growatt sp2000?

[Uksa007]

Hi, does it work with growatt sp2000

Hard to tell the manual doesn't seem specify what the Battery Communications is.
You would be best to check with your supplier and confirm it can support Pylon CAN bus protocol.

Regards.

[Mihaipm]

Hi Uksa007,i have an Mpp Solar 3024 GK inverter and a bank of lifepo4(8cells) with Jk bms(jk-b1a20s15p).The inverter has the pylontech protocol,you think your hardware will work?I have a rpi 4 for SA and both(inverter&jk bms)are connected to rpi 4 but the data on the inverter are not the same with the data on jk bms.Thanks for the replies

[Uksa007]

Hi,

Do you have a list of supported Batteries your inverters supports, most of the MPP inverters only support RS485, or CAN using their own protocol.
It would need to support Pylon protocol over CAN Bus for it to work with my interface.

Regards

[Mihaipm]

The manual says :"BMS communication port:CAN and RS232 or RS485" and a spacial cable for Pylon battery...Regards

[Uksa007]

You would be best to check with your inverter supplier and manufacturer to confirm it can support Pylon CAN bus protocol.
Pylon can use both RS485 and CAN, my understanding is MPP only support Pylon over RS485.

[ans-gw]

As also me need this,so I just wrote email to get CAN protocols and CAN LIb-protocol, and RS485 protocol.
I ll update when they send me.
Here have some information:https://powerforum.co.za/topic/10545-bms-communication-with-axpert-max/

[Mihaipm]

https://github.com/Mihaipm/Mpp-Solar-Lib/blob/9d7aced0e77dc32ef148f7d3af399e1a2912283f/(LIB)%20BMS%20485%20communication%20protocol%2020201208.pdf

[Mihaipm]

This is what i found...! I don't if matched with your hardware.

[Uksa007]

That is an RS485 protocol, very different from Pylon CAN protocol.
I do not support it.

[Uksa007]

I have a long term project to support Pylon over RS485 see here for more info.

[ans-gw]

I attach Bms can protocol
Uploading MPP Solar inverter BMS CAN communication protocol 20220304.pdf…

[Nzlithium]

Hi Peter, Jesse from NZ Lithium here, I would like to discuss some potential options with this, email is my preferred way to communicate, my business and contact details can be found on Google or Facebook. Cheers

[FurTrader]

This is Steve from Overkill Solar LLC, I'm interested in distributing your hardware, can we talk?
I see that your supply is limited, I can help manufacture it, and I think there is a lot of interest from my BMS customers.

Steve@overkillSolar.com

[geolin]

Hi,

I am using three jbd-bms with Victron System.
No jk-bms. Which Hardware-Kit do I Need? I didn‘t find that combination on your Patreon Page.
Thanks a lot!

[RicardoJMG]

Hello, i have few hundred units of Vision 48v 100Ah, that have no comunication with inverter, has own bms and not possible to change firmware... new from factory. Does this device allows to get readings to the inverters? cel voltage and temperature? Cheers

[RicardoJMG]

Hi, thank you for reply... any clue about software i can use? Although manufacturer says bms not allow any changes of firmware...

[Uksa007]

You would have to find out what make and model of the BMS(it may be written on it) then google.
Else replace the BMS with a JK-BMS and use my interface boards.

[RicardoJMG]

Have to unassemble... will do that. If i have to change all bms, i guess i will be screwed, it's a lot of units. if i could use the interface between the bat as it is , and the inverter. will have lot of less work.
I will open and check, asap will give you feed-back.
Thanks

[Uksa007]

Please understand, My interface is probably not to work with whatever that BMS is as I only support JK and JBD Serial protocols.

[RicardoJMG]

Understood, but i really don't know what is used anyway... and also have to give a path to solve this. one way or the other, if there is any chance to solve this. buying 1 or 2 interfaces will do no harm at all. Thank you for advice

[geolin]

Hi @Uksa007 ,

how do I Order three boards (for Jbd-bms; one master, two Slaves)? I could Not figure out how to do that via Patreon. I can only find the Multi-bms options for Jk-bms.
Thanks for some Info.

[Uksa007]

Hi,

Sorry I currently don't have an option for that at the moment, as I'm still working on upgrading the firmware for the JBD Multi Master with all the new features, and things are a little crazy at the moment.

What Inverter are you using?
I have the previous version that works fine for most inverters, just doesn't have native victron support or float mode (still works fine with Victron using pylon)

[geolin]

I am using Victron. If I am using pylon would I have the option to upgrade the Firmware once you have the Firmware ready for JBD-Multi Master ?

[Uksa007]

Yes the firmware is upgradeable.

[geolin]

Ok, so how do I order three jbd-boards in a Multi Master configuration?
What do you think will the new jbd-Multi Master Firmware be available? Would that Upgrade be free of charge for me if I order the Boards now?

[Uksa007]

Yes, It will be about 28 days before I can ship your order as there are a lot of order in front.

You can purchase here.
https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=DW4TQ2BV5G98C

[trippfam07]

Is this open for other people to build?

[Uksa007]

I tried that approach and it resulted in me spending all my time trying to help people build hardware with little to no electronics experience, and then configuring and compiling the firmware was not easy for most.

The solution is I supply the hardware and firmware configured how you want, plug and play, you end up with a quality product as opposed to modules connected with dupont connecters which is unreliable at best.

[trippfam07]

I am an electrical engineer, more on the controls side but would love a chance to do it myself. Do you have a list of components that I would need for 4 jk bms. I see the code is on github?Sent from my iPhoneOn Dec 7, 2023, at 5:15 PM, Uksa007 ***@***.***> wrote: I tried that approach and it resulted in me spending all my time trying to help people build hardware with little to no electronics experience, and then configuring and compiling the firmware was not easy for most. The solution is I supply the hardware and firmware as a package configured how you want, plug and play, you end up with a quality product as opposed to modules connected with dupont connecters which is unreliable at best. —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you commented.Message ID: ***@***.***>

[Uksa007]

Only what is on the main page here, the code is old and has been deprecated(it was only single bms), it probably won't compile.
Sounds like you are after my multi-bms solution, which has never been available here.

[trippfam07]

So how much would it run me for the multi Sent from my iPhoneOn Dec 7, 2023, at 7:32 PM, Uksa007 ***@***.***> wrote: Only want is on the main page here, the code is old and has been deprecated(it was only single bms), it probably won't compile. Sounds like you are after my multi-bms solution, which has never been available here. —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you commented.Message ID: ***@***.***>

[Uksa007]

Various different options here

[trippfam07]

I am currently using an esp32 on all 4 of my bms and it is integrated with ha but it won't talk with my growatt.Sent from my iPhoneOn Dec 7, 2023, at 7:33 PM, Corey Tripp ***@***.***> wrote:So how much would it run me for the multi Sent from my iPhoneOn Dec 7, 2023, at 7:32 PM, Uksa007 ***@***.***> wrote: Only want is on the main page here, the code is old and has been deprecated(it was only single bms), it probably won't compile. Sounds like you are after my multi-bms solution, which has never been available here. —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you commented.Message ID: ***@***.***>

[Uksa007]

Only some of the growatt support Pylon over CAN bus eg SPF 5000ES
Most only support RS485 which I don't currently support (work in progress)

[Marky0]

Hi, I current have three pylontech US5000 batteries in my system, and am looking to increase my storage capacity. Does this solution allow me to slave a JK BMS with my existing US5000 batteries ? Thanks in advance.

[KrisB12]

Dear #Uksa007,

I have a DEYE SUN-6K-SG03LP1-EU connected with 2 jkbms B2A24S20P in parallel and voltage gestion.

I like to know if I can use 2 simples interfaces ESP32 to add communication because there are RS485 parallel connections?

Thanks.

[Uksa007]

I believe you would need a Multi-BMS kit: 1x Master and 1x Slave, connected to the BMSCAN port.
This provides the Master inverter with the combined data from all the BMS

Please consult with the manual for your inverter model
More info here: https://www.youtube.com/watch?v=mqBZ5LPvmUs&ab_channel=DeyeInverter

[KrisB12]

Ok Thank you.

Happy holidays.

[bastawine]

this is great ,

are you going to make this for Daly bms to ?