Good Sam Club Open Roads Forum: Tech Issues: Lithium cost keep dropping!
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 > Lithium cost keep dropping!

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time2roll

Southern California

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Posted: 10/11/21 12:05pm Link  |  Quote  |  Print  |  Notify Moderator

Very little to no difference between 2 hour rate and 20 hour rate with LFP.
Not even close to the issues with lead-acid peukert decline at high rates of discharge.

Most of the prismatic cells I see recommend C/2 (2hr) as the top normal rate and C/1 (1hr) as the maximum discharge or charge rate. Most recommend 2.500 to 3.650 volts per cell. Most of the energy is contained in 3.000 to 3.400 volts per cell. Premade battery cell manufacturer can choose the limits they want to meet the capacity and warranty requirements. All premade battery limits will be different and proprietary. Need to build your own to know your programmed limitations.

I think some of the cylindrical cells may go to 3C or higher.


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mobeewan

Hampton, Va

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Posted: 10/11/21 09:46pm Link  |  Quote  |  Print  |  Notify Moderator

Will Prouse just gave SOK brand LiFePO marine grade a good review.

Has BMS and half the price of BB 100 Amp and twice the capacity 206 Amp but only has 1/2 the discharge rate.

time2roll

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Posted: 10/11/21 10:18pm Link  |  Quote  |  Print  |  Notify Moderator

mobeewan wrote:

Will Prouse just gave SOK brand LiFePO marine grade a good review.

Has BMS and half the price of BB 100 Amp and twice the capacity 206 Amp but only has 1/2 the discharge rate.
At same price get two for same load rating and 4x capacity.

S Davis

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Posted: 10/22/21 06:54pm Link  |  Quote  |  Print  |  Notify Moderator

Just finishing up my first 280ah pack, still need to torque all the connections, trim the all thread and add acorn nuts.

Eve 280ah 12volt cell

otrfun

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Posted: 10/23/21 09:37am Link  |  Quote  |  Print  |  Notify Moderator

S Davis wrote:

Just finishing up my first 280ah pack, still need to torque all the connections, trim the all thread and add acorn nuts.

Eve 280ah 12volt cell
Nice job on those interconnects! We so wanted to go with 280ah cells for our truck camper. We reluctantly went with 200ah cells so we could fit everything in a group 24 battery box.

S Davis

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Posted: 10/23/21 11:17am Link  |  Quote  |  Print  |  Notify Moderator

otrfun wrote:

S Davis wrote:

Just finishing up my first 280ah pack, still need to torque all the connections, trim the all thread and add acorn nuts.

Eve 280ah 12volt cell
Nice job on those interconnects! We so wanted to go with 280ah cells for our truck camper. We reluctantly went with 200ah cells so we could fit everything in a group 24 battery box.



Thanks, I am building three to start with two mounted in my truck where the inverter will be installed and one spare.

3 tons

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Posted: 10/23/21 11:53am Link  |  Quote  |  Print  |  Notify Moderator

Very Nice work!! Could you provide a source for the several components??

jaycocreek

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Posted: 11/02/21 05:36am Link  |  Quote  |  Print  |  Notify Moderator

First I have seen a sub $300 100ah lifepo4 with coupon on Amazon.

$299 for 100 ah lifepo4 on Amazon..Wow

Gjac

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Posted: 11/04/21 12:30pm Link  |  Quote  |  Print  |  Notify Moderator

jaycocreek wrote:

First I have seen a sub $300 100ah lifepo4 with coupon on Amazon.

$299 for 100 ah lifepo4 on Amazon..Wow
Maybe in several years they will be down to $200 that would be on par with 2 6v GC batteries, maybe by then I will need new replacement batteries.

StirCrazy

Kamloops, BC, Canada

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Posted: 11/05/21 06:52am Link  |  Quote  |  Print  |  Notify Moderator

Gjac wrote:

jaycocreek wrote:

First I have seen a sub $300 100ah lifepo4 with coupon on Amazon.

$299 for 100 ah lifepo4 on Amazon..Wow
Maybe in several years they will be down to $200 that would be on par with 2 6v GC batteries, maybe by then I will need new replacement batteries.


man I wish we had your prices on batteries up here. a cheep 6V is 150.00 one worth using with a higher capacity is about 250 each...

Steve


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