DIY Electric Conversions Economic Way to Bottom Balance LiFePO4 Cells
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- čas přidán 2. 05. 2017
- An inexpensive way to bottom balance your lithium iron phosphate battery cells.
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I like how you put your hand over both positive and negative battery terminals repeatedly
That's because 0.000033 amps does not seem to bother me. (3.3 volts/100,000+ ohms = 0.000033 amps) Ever touch both terminals of a car battery? Glad to hear you like my animation and appreciate your watching the video.
where do I find the device you used to detect the low voltage and programed to 3.2 volts to turn off the relay?
Amazon or eBay
Do you have a parts list for the relays?
A 40 amp automotive relay will work.
What about the lead acid batteries?
You do not bottom balance lead acid batteries.
Hi EV4U, nice session about BB!
With 16pcs EVE 280K cells on their way to my home, I want to connect them in series and discharge them with my Victron Multiplus 5K until the cells are almost empty.
I have a BMS connected in order to stop discharging when one of the cells take a nose dive below 2,5V.
I lso have the luxury of a 200W Siglent Electronic load that can discharge with 30 Amps to a specific setpoint before shutting down and stop discharging.
After having discharged all the 16 cells separately to about 2,5V, I want to connect them parallel to do the last discharge dive into 2,5V before connecting them in series and charge them up to 55V.
My only question is: how long will a brand new 280Ah cell "survive" a zero S.O.C?
I will need at least two weeks for draining each cell untl 2,5 V is reaced, will this be a problem?
What do you think of my approach?
Keep up the good works, I like your builds!
Please note that we bottom balance to 2.75 volts not 2.5 volts.
@@ev4u good to know, but how long can you leave a cell at this low voltage?
No sure what the time limit might be. We bottom balance, install, and charge within a couple of weeks.
@@ev4u thank you, that will do the trick 👍
I see that your setting is 2,5 V, then the discharge stops and the voltage crawls up to 2,8V-ish in order to trigger the discharge again until the voltages stops reaching the 2,8 Volts.
Did I overlook someting ore IS there a second hysteresis setpoint at 2,8 I didn't notice?
Loooked your video again and found the answer, very neat way of simply prepping your batteries for a project.
Woll investigate if my 200 Watt siglent DC load has tricks on it's sleeve to do the same 😃