Seeking Cable Solution for Communication Between PowMr Inverter and Daly BMS in My Custom Battery System

[paulchen87]

Hello Community,

I've built a custom battery using Samsung and LG 18650 cells, configured in a 14S80P setup, and integrated a Daly Smart BMS for its management. The system is powered by a PowMr inverter, model POW-HPM5.6KW.

I am currently looking for the best way to make or purchase a cable that would allow communication between my inverter and the BMS. The goal is to optimize system performance by monitoring and adjusting battery parameters directly from the inverter.

I understand both devices support RS-485 communication, but I am also open to other suggestions or practical solutions based on your experience. Additionally, if you have recommendations for specific types of cables or connectors that should be used in this context, please let me know.

I am particularly interested in:

• Advice on the wiring diagram for connecting the Daly BMS to the PowMr inverter.
• Recommendations on where I could purchase a pre-made cable, if available.
• Any other tips or best practices for implementing effective communication between the BMS and inverter in a DIY system.

Thank you in advance for any information or guidance you can provide! I deeply appreciate the community's experience and knowledge.

Best regards,

Paul

 

[J_Mack58]

Hey Paul,
I like a good challenge and you certainly presented one. First I downloaded the manual to you POW-HPM5.6KW and I was disappointed
to see no CANBus communications but it has two RS-485 ports. I looked at the Daly Smart BMS and it apears you can get all the communication for it, CANBus, Bluetooth, Uart and RS-485. Looks like you going to be doing RS-485. Only thing the manual does not talk about is hooking this Inverter/charger to a smart battery with communications. It talks more about hooking the Inverter/Charger to a computer that they developed so not just any laptop, and wi-fi to a mobile app that they developed to observe how it's operating and change parameters. You need a middle man. Communicating on RS-485 the middle man collects the information from your DIY battery and the Inverter and does something.

• Advice on the wiring diagram for connecting the Daly BMS to the PowMr inverter.
• RS-485 (The only way you can)
• Recommendations on where I could purchase a pre-made cable, if available.
• You will be making this. RS-485 cable, The RS485 port coming off your inverter is a standard Ethernet cable connection while
• the DALY-BMS is a USB Connection. We know the Data A , Data B lines and ground on the Battery side. On the Inverter side we have
• 8 lines to choose from with no documentation I would use my Fluke 123 Oscilloscope and find them. Often times you not the first person that is trying this so it may be information out there. Going to be a lot of googling.
• Any other tips or best practices for implementing effective communication between the BMS and inverter in a DIY system.
• CANBus is the way of the world, but that is a no go on your inverter so forget about it.

I think the Inverter/charger is the brains of your operation. It knows when the Battery is getting low and it has to go off Battery and on to Utility
Power for your loads and charge the battery. System have operated for years with the Battery not being smart. The just got smart as of late. I don't know if you are up for the task or even there needs to be a task. The Daly BMS is going to do it's thing and you can get the information as what it is doing on all of our favorite ways to communicate. Your Inverter/charger is going to do it's thing, it's just going to be looking at that Battery voltage which is not the best way to determine battery State of Charge (SOC) or State of Health (SOH) But one thing for sure when the battery start getting down to that 44 -45 volt area the PowMr is going to go to Utility and power your loads and it may have a parameter to charge or not charge the battery. With all I have said, Man you don't need to do anything!

 

[paulchen87]

many Thanks j_Mack58