[RE-wrenches] .5 C charge rate for LiFePO4

[Steve Higgins]

For Rolls/Surrette LFPs, .5 is the suggested max, but on a 130ah bank, 13
to 65 amps is acceptable. We'd like to see it around 20-40a.      Remember,
if you go with lower charge rates, this increases charge time, and if you
have batteries in parallel, having a bit higher rate gives you more time
for the absorb cycle to balance the bank, especially if it's an open-loop
comms system.   If open-loop and you have 2, 3, or 4 parallel strings, the
longer 30-60 mins absorb timers allow for better balancing between the
parallel strings.


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On Fri, Aug 25, 2023 at 6:33 AM Mac Lewis via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Hi Jeremy,
>
> I think LiFePO can handle these high charge rates, but you don't have to
> provide them for battery health.  They are happy at lower C rates too.
>
> On Fri, Aug 25, 2023 at 6:41 AM Jeremy Rodriguez via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Is it correct to size an PV array to provide .5C for a Lithium Iron bank?
>> 130Ah x .5 = 65
>> 65A = ~ 3.5kw PV DC
>> Seems overkill for one battery.
>> Any advice is appreciated.
>>
>>
>> Jeremy Rodriguez
>> Solar Installation / Design
>> All Solar, Inc.
>> 1453 M St.
>> Penrose Colorado 81240
>>
>> Sent by Jeremy's iPhone. Sorry for typos and shorthand.
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> --
>
>
>
> Mac Lewis
>
> *"Yo solo sé que no sé nada." -Sócrates*
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