I agree. Voltage on LFP cells is useless for determining the SOC.
The voltage is very constant except at near 100% SOC and at 0% SOC.
You really need information about the middle, and voltage doesn't give any clue about that.


You need to count the amp-hours, like with an E-meter or a Cycle-Analyst.

Bill D.

On 8/6/2017 7:00 PM, Willie via EV wrote:


On 08/06/2017 07:38 PM, Matthew Quitter via EV wrote:
Hi Guys,

My 1238-6501 Curtis controller gives very different SOC % for similar
voltages.

For example I've recorded a pack voltage of 82.2 and had the Curtis show
22%, 31%, 43%.

The pack is made up of 25 Thundersky 160Ah batteries.

With LFP cells, you can't accurately infer SOC from voltages in the middle of the range. The voltage/SOC curve is too flat.
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