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LiFePO4 Fuel Gauge for higher capacity 20Ahr-40Ahr, multi-cell batteries ??
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dazz1:
Hi
I need a fuel gauge for  4S (4 cell series ~ 12V) LiFePO4 batterys with capacities in the range 20Ahr to 40Ahr.  The batteries are off-the-shelf traction type designed for deep discharge.

I have been looking at fuel gauge ICs.  Most are for single cell applications.  Some don't do LiFePO4 chemistry.  I can't find one that will do higher capacity batteries.

Any suggestions ??

MadScientist:
The best way is a micro controller programmed up , an attiny would be ideal. You really need to factor in Pukerts law , even if it’s close to 1 for Li chemistry .  You need to decide if you want just battery level monitoring or cell level monitoring as well
aldi:
I've some experience with the BQ40Z60 from TI (http://www.ti.com/product/BQ40Z60). It supports up to 4S / 25V, so it think it fits the bill. It takes some time to understand and tweak all the parameters, but when you've tweaked all the parameters to perfection it can be a nice, accurate IC.
dazz1:

--- Quote from: aldi on March 23, 2019, 09:27:19 am ---I've some experience with the BQ40Z60 from TI (http://www.ti.com/product/BQ40Z60). It supports up to 4S / 25V, so it think it fits the bill. It takes some time to understand and tweak all the parameters, but when you've tweaked all the parameters to perfection it can be a nice, accurate IC.

--- End quote ---

Thanks.
It took a lot of digging but this device will work to 32A.Hr battery capacity. Good enough for my application.
It also includes a lot more features that I will ever use.
ttyridal:
You also have BQ34110 and BQ34Z100-G1 which looks very nice and quite simple to use.
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