Monitoring the voltage of my 2S2P (12v) battery bank... using CellMeter 8 ???

[Scoob-SanDiego]

Using 4x 12V 100Ah LiTime LifePo4 batteries to build a 2S2P 24v batteries I am now looking for something to monitor
that the batteries are string nicely balanced.

I got a pack of cheap volt meters:
https://www.amazon.com/Battery-Indicator-Voltage-Capacity-Lithium/dp/B09JSJDY8N/
But it turns out that they are only precise to decimal point and even at that level they are not very precise...

I was thinking of using a CellMeter 8 for the task.
It is clearly designed to work with CELLS so typically < 4v per cell but I could not find any documentation where they specify
any maximum input voltage.... i.e. each one of MY cells would be a 12V lifePo4 battery.
https://www.amazon.com/gp/product/B073W4MDHC

Does anybody have experience with the CellMeter 8 and knows if it will take the 12V cell input?

And if not the CellMeter 8, do you have any suggestion for a cheap always-on volt meter cell I could use to monitor the state of balance of my 2s2p battery?
Either cheap (but accurate) voltmeters OR something like the CellMeter 8 which monitors all cells and even shows you the maximum delta drift between the highest and the lowest cell?

Thanks!
- Christian

 

[sunshine_eggo]

highly doubt the cellmeter 8 will tolerate 12V. most devices of that nature have a 5V limit. It's also only useful on a string of cells. You have two parallel strings.

If you have a separate multimeter, you can confirm the voltmeters at least correlate to each other, and honestly, while .X feels inaccurate, it's actually eliminating a lot of noise. First, Below about 13.8V, deviations in the 12V batteries should be < 0.1V. Above 13.8V, 0.1V is accurate enough to confirm the batteries are "balanced enough."

If you just want balancing:

https://www.amazon.com/MAZAVA-Equalizer-Regulator-Batteries-Connected/dp/B09GLS1DVR

If you want balancing AND monitoring:

https://www.amazon.com/Display-Battery-Equalizer-Voltage-Balancer/dp/B09GLMCNXK