[RE-wrenches] Lithium battery charge rate

[Steve Higgins]

Yes, thanks, Darryl...   I did mean the C/2 or C/3 rate...


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On Wed, Jun 28, 2023 at 8:47 AM Starlight via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> That makes more sense, Darryl, thanks for sharing that. Another good
> example, Jay.
>
> We do have batteries that can be charged at 3C but I have only designed
> one mobile medical unit with that capability. It required 2 50A shore power
> connections or could use the onboard 20kW generator. Makes lots of heat
> doing so and heat is battery enemy #1, molten salt batteries excluded.
> Lower operating temperatures is a good reason for using lower C rates.
>
> Larry Crutcher
> Starlight Solar Power Systems
>
>
>
>
> On Jun 27, 2023, at 7:49 PM, Darryl Thayer via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> Hi Jay and all,  I belive Steve meant C/2 or C/3; just a typo. My oldest
> set of LiFe is almost 10 years?  It has a fastest charge rate of C/0.2
> because the 10 kWh is charged by 1.6 kW solar.  These batteries are doing
> fine.  I do not have a way of measuring the current capacity but
>
> On Mon, Jun 26, 2023 at 3:58 PM Jay via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Hi All
>>
>> I’m wondering if minimum charge amps for lithium is common or not?
>>
>> Or does it have to do with the cell shape: cylindrical vs prismatic vs
>> pouch?
>>
>> A client purchased some EG4 batteries and they are getting a bit out of
>> balanced. Tech support didn’t suggest higher volts or longer absorb but did
>> mention they need 30-50 amps charge. It’s not in the manual.
>>
>> Wondering what you all think and know
>>
>> Thx
>> Jay
>>
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