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Old 08-07-2018, 02:52 PM   #1 (permalink)
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BMS Wiring for LiFePO4

I bought some cheap Ebay BMS boards for my 4s LiFePO4 batteries that I intend to put into motorcycles. The model number is HX-4S-F100A, but I cannot find any instructions on how to use these other than the graphic printed on the label.



C- is supposed to be connected to the charger, and P- is supposed to be connected to the load. My question is, can these be connected together, since in a vehicle both the load (starter/accessories) and charge (alternator) use the same connection? I haven't found a schematic or anyone else showing how they connected the board, so I don't know if those connections can be shared.

Finally, would this board provide balancing if only the balance leads are connected?


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Old 08-07-2018, 04:07 PM   #2 (permalink)
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Let me know how it works.
I spent about $600 on cells for my 60ah 13v LiFePO4 batt. A BMS wouldn't be a bad idea.

It won't work unless you external charge it. You need at least 14.8v a vehicle alt will typically make 13.8 to 14.4v most make around 14 to 14.2v I have found.
I say external charge it.

I would hook the battery straight up to the vehicle charging system like normal, since you are only supposed to run 10 amps through the charger circuit. An lithium battery will take full alternator output, which will be a lot more than 10 amps, bad for the charger circuitry.
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Old 08-07-2018, 04:25 PM   #3 (permalink)
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Yeah, I'll probably just experiment to see how it goes, and measure current flow given difference scenarios.

My motorcycle probably wouldn't put out too much current for the BMS to handle, but as you mention, it probably won't charge at all if it's not getting more than 14.8v. If that's the case, I'll see if it still serves a balance function. Was really hoping it could provide low voltage disconnect ability.

Maybe I'll put one of these batteries in a car, and use a small solar panel as the charge input. I'm assuming it's ok to use the charge connection and leave the load connection unused.
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Old 08-07-2018, 04:43 PM   #4 (permalink)
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I don’t see it working; they make BMSs that charge through the same port as the discharge. That’s probably the right way to go.

Otherwise you could run your alternator straight to the charge port, and let the discharge port run the bike, or else throw in Diodes to speed are the one from the other....
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Old 08-07-2018, 05:01 PM   #5 (permalink)
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I recently watched a video on this.

It has a serial port and you can buy a bluetooth dongle for it.

Then there is an app for it ( or computer program and usb to uart converter) where you can calibrate it and define a whole bunch of parameters like do you want balancing while discharging or charging. It also had a input voltage cutoff if i remember correctly.

May not be ghe same one.
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Old 08-07-2018, 06:34 PM   #6 (permalink)
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I don't think this device has the smarts to be programmed. The diode idea sounds interesting, but would represent yet another drop in voltage that would need to be overcome to charge the battery, and they would have to be rated for large power.

I'll try to play with the BMS tonight with a solar panel and see what it can do. The thing I liked about the specs is the extremely low working power draw, so it wouldn't run down a battery that was sitting for long periods of time.
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Old 08-08-2018, 07:43 AM   #7 (permalink)
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Large LiFe starter batteries are very prone to stay balanced and don't necessarily need a bms if you can manually balance a couple times per year. They also have extremely low self discharge so can sit for a year without going dead.

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