Hi Michael,

Fortunately in the U.K. it never gets that hot!!!

I've got 25 160Ah Thundersky in series. I believe they're 3.3 nominal and 
online it says not to charge over 4V. But I'm never certain about that. 

Thanks,
Matthew

Sent from my iPhone

> On 7 Aug 2017, at 12:59, Michael Ross <michael.e.r...@gmail.com> wrote:
> 
> The surest way to destroy a pack of LFP cells is to fully charge them and let 
> then get hot as in over 100F. 
> 
> Can you tell us the number of cells and their parallel series configuration? 
> Then specific recs can be made.
> 
> You may want to consider cutting of charging before fully charged state is 
> reached and never let them sit in a hot place if you have charged them to a 
> high SOC.
> 
> The problem is the positive electrode becomes very reactive with the 
> electrolyte when fully charged and temperature sets off a destructive process.
> 
> I speak from experience, but also researching it. There is a long and 
> interesting video on YouTube of professor Jeff Dahn a long time battery's 
> researcher, discussing his. Try searching Jeff Dahn Waterloo lithium or 
> similar. It was a lecture he gave at Waterloo University. Dahn is an 
> electrochemistry at Dalhousie University in Novelty Scotia.
> 
>> On Aug 7, 2017 3:00 AM, "Matthew Quitter via EV" <ev@lists.evdl.org> wrote:
>> Thanks guys... but if the charger is turning off at a fixed voltage how do I 
>> get more power into the pack?
>> 
>> 
>> > On 7 Aug 2017, at 05:02, Bill Dube via EV <ev@lists.evdl.org> wrote:
>> >
>> > 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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