[RE-wrenches] Lithium battery charge rate

Dave Angelini Offgrid Solar offgridsolar at sti.net
Wed Jun 28 09:55:53 PDT 2023 

Steve, you folks still sell the Discover 6650 ? that I use alot. It is 
faster than C2, they claim. Not that one would want that offgrid where 
long life is required. Pretty amazing battery for winter genset use.

ROLLS S24-2800LFP & S48-6650LFP ESS OPERATING MANUAL

ENHANCED RUNTIME

  	* Double the high-current runtime of lead-acid battery
  	* Up to 100% usable capacity
  	* Up to 100% depth of discharge

EXTENDED SERVICE LIFE

  	* 10x the life of lead-acid battery (BCI-06)
  	* Unlimited Partial State of Charge cycles
  	* 10-year energy throughput warranty (Requires Registration)

FAST CHARGING

  	* Up to 5x faster than new lead-acid batteries
  	* Up to 10x faster than aged lead-acid batteries
  	* 2X faster charging than C/2 Rated lithium batteries
  	* 1C continuous charge rate, regardless of SoC

SURGE POWER

  	* Power for off-grid inverter surge demands
  	* Up to 3C peak power discharge rate
  	* 1C continuous discharge ra

Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
e-mail  offgridsolar at sti.net
text 209 813 0060

On 2023-06-28 8:50 am, Steve Higgins via RE-wrenches wrote:

> Yes, thanks, Darryl...   I did mean the C/2 or C/3 rate...
> 
> [1]
> Steve Higgins ⋅ Technical Services Manager
> t +1.902.597.4020  m +1.206.790.5840
> f +1.902.597.8447  e steve at surrette.com
> [2] [3] [4] [5]
> 
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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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Links:
------
[1] http://www.rollsbattery.com
[2] http://www.facebook.com/RollsBattery
[3] https://www.youtube.com/RollsBatteryEngineering
[4] https://www.linkedin.com/company/rolls-battery-engineering
[5] http://www.instagram.com/RollsBattery
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