First Zivan + Goodrum/Fechter BMS Test Run

This is a test run of charging a 24s x (5p) pack of Headway 38120S LiFePO4 cells using the Goodrum/Fechter battery management system (BMS). A Zivan charger is used in tandem with the BMS to provide the charging voltage. This is the battery pack for an on-road electric vehicle.

Category:

Science & Technology

Tags:

• Electric
• Vehicle
• EV
• LiFePO4
• Goodrum
• Fechter
• Zivan
• Charging
• Headway

[txhambone]

Hi Ozer,

I can't figure out how to link it to the video or I'd share the .pdf of the BMS with all its diagrams. Let me try a couple of things.

[alexthegreat1978]

Do GGoodrum bms work correctly?

[txhambone]

@alexthegreat1978 - The BMS does work relatively well. From people with more experience designing BMS systems this board is very much a brute-force approach to top-end cell balancing. The LVC detection is perfectly functional and elegant. I would suggest using it with switching power supplies as GGoodrum does and not with a Zivan like me - I've had to hack my system to get the BMS and the Zivan to play nice together.

[Doctorbass]

Very informative video! Great!

I built the same but for a 40s setop using thundersky 100Ah cells.

I also use a zivan charger and i am wondering if you added the capacitor smoothen the pulse current generated by the BMS mosfet on and off switching?

Did you noticed that the ZIVAN need to detect voltage present at the output to start? if so how did you solve that? Finally what are the charge curve you programmed for it? since the bleeding resistor work with 0.5A to balance correctly?

[txhambone]

Hi Doc,

Thanks! I am using Zivan charge curve #312. Regarding the capacitor: Check out the DIY-EC forum in the thread titled "Re: Redesigned Goodrum/Fechter BMS", second page. YouTube won't let me post a direct URL link here :-/

[dsealp4746]

Hello. Could you share block diagram of battery/BMS and charger combination.

Thank you, Ozer Arslan