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Old 01-30-2023, 07:45 AM   #21
jasonojordan
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Default Re: Budget 90ah 48v lifepo4 battery build (under a grand)

Looks like some good progress!
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Old 01-30-2023, 07:49 AM   #22
augiedoggy
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Default Re: Budget 90ah 48v lifepo4 battery build (under a grand)

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Augiedoggy......NOLEX is the best stuff on the planet! (Well...mebby not the best for everything!)

I like the fact that you can build your pack inside your home. The Mrs' would toss out the pack and me if I attempted that!!

And finally....what is this component? Is this the balancing device for the pack?
Yeah being the freezing temps are bad for the battery and its like 30 degrees in my garage... I am getting some pressure from the girlfriend on the "mess" on the livingroom floor but she knows she will get as much use out of it as me. you cant see it but the pack is on a 1/2" piece of plywood to keep that nasty box off my already trashed carpet.

That device is an active balancer. when the cells are either at a high or low state of charge I turn that on if the pack is out of balance and it will take up to 5amps from the high voltage cells and transfer to the lower voltage cells if needed. It can also get a pack that drops below my 3v per cell if one or 2 drop threshold working again to get me back to the campsite.
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Old 01-30-2023, 08:50 AM   #23
Volt_Ampere
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Default Re: Budget 90ah 48v lifepo4 battery build (under a grand)

Nice job! Where did you get the active balancer? How do you control when it can balance?
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Old 01-30-2023, 08:54 AM   #24
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Default Re: Budget 90ah 48v lifepo4 battery build (under a grand)

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Nice job! Where did you get the active balancer? How do you control when it can balance?
Amazon and eBay has them but I bought this one on aliexpress.They all have a little soddered jumper that's closed. I opened it up and soldered a couple wires to control it Through a switch. I thought about hooking it up to a voltage switch so it would come on automatically but it was more work than it was worth. Hopefully, I don't need it all too often
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Old 01-30-2023, 09:15 AM   #25
Volt_Ampere
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Default Re: Budget 90ah 48v lifepo4 battery build (under a grand)

The balancer that I built into my Leaf pack is manually controlled from my display. (with a minimum voltage to operate because I top balance) I find that I don't have to balance very often. I look at cell voltage after charging every so often and if it needs it, I turn on my balancer. It turns off when all cells are within 10mV.
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Old 01-30-2023, 09:23 AM   #26
augiedoggy
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Default Re: Budget 90ah 48v lifepo4 battery build (under a grand)

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The balancer that I built into my Leaf pack is manually controlled from my display. (with a minimum voltage to operate because I top balance) I find that I don't have to balance very often. I look at cell voltage after charging every so often and if it needs it, I turn on my balancer. It turns off when all cells are within 10mV.
The BMS I chose does have Built-in passive balance that works that way and I will leave that on for day to day balancing Passive balance tends to waste energy because It uses resistors to bring down the voltage
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Old 01-30-2023, 09:50 AM   #27
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Default Re: Budget 90ah 48v lifepo4 battery build (under a grand)

For me, passive is fine. It does waste energy but so little that I would never notice it. I built my own - it has an LED for each cell and it discharges high cells at about 1 amp which is enough to do the job if the cells start out reasonably balanced. (which they were)
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Old 01-30-2023, 09:53 AM   #28
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Default Re: Budget 90ah 48v lifepo4 battery build (under a grand)

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For me, passive is fine. It does waste energy but so little that I would never notice it. I built my own - it has an LED for each cell and it discharges high cells at about 1 amp which is enough to do the job if the cells start out reasonably balanced. (which they were)
Don't get me wrong I agree With you the passive balancing in my BMS is like 900 ma. I have read That under high sea rate loads the packs can sometimes wander out of balance Regardless which is why I put in the active balancer Plus I really don't know how well these Is cells are matched yet
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Old 01-30-2023, 09:56 AM   #29
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Default Re: Budget 90ah 48v lifepo4 battery build (under a grand)

My only concern with any balancer circuit is that if it fails, it can kill a cell since the BMS can't protect against it discharging.
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Old 01-30-2023, 09:59 AM   #30
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Default Re: Budget 90ah 48v lifepo4 battery build (under a grand)

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My only concern with any balancer circuit is that if it fails, it can kill a cell since the BMS can't protect against it discharging.
So the positive terminal is switched on this balancer so when it's off the circuit It is incomplete but it is something to be mindful of Because the right type of short could still cause what you're describing being the negative is also the positive of the next cell
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