[RE-wrenches] Lithium battery charge rate

[Starlight]

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 <mailto: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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