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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