Charging check

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Oct 21, 2017
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Hi everyone!

Back again!! so new quick question for you!!

Charging a 14s60p pack what would you consider a safe charge? I think I should be charging to 58.8v so each series is charged to 4.2v but when deciding on Amps what would you guys recommend?

:D
 

daromer

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Max amps is the amps you tested the cells at. If you tested at 1A max charge is 60A.

If you decide to go to 4.2V do have a proper BMS monitoring it! Otherwise you cant guarantee that all cells are equal.
 

DarkRaven

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Safe charge is either what is specified by the manufacturer if the cells are new or what your test results were if they are used cells.
A 60p battery with new cells can easily be charged with a couple of hundred amps. If it is used and tested at 1A then you can charge at 60A.
58.8V is correct for 14s but is only safe if the cells and packs are matched. If they aren't it isn't safe because you can't guarantee that the 58.8V are divided equally across the 14 packs. You need to use a BMS, balance charging, control it manually or use a lower voltage and observe the charging process and the result.
 

wim

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Chargingto a bitlower thenthe specified voltage ( i.e. 4.10V instead of 4.20V ) is not only safer but you also gain in cycles.

And not much power to gain up there... ;)
 
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daromer said:
Max amps is the amps you tested the cells at. If you tested at 1A max charge is 60A.

If you decide to go to 4.2V do have a proper BMS monitoring it! Otherwise you cant guarantee that all cells are equal.

Hey Daromer

I was wondering if my expectation of 1A (60A in total) would be seen as acceptable!

I am charging all cells to 4.2v pre-install and will probably maintain the charge to around 57v at 45A until Batrium has been brought and installed! Again I am all about the planning at the moment!

Cheers Dude
 

Korishan

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It's like taking a vehicle engine and having 5500RPM vs6000RPM. Those 500rpms at that speed aren't going to give you a whole lotta HP.
I'd recommend the 4.1V, or even 4.15V, but not go higher than that. That also gives you a little floating room to let the BMS do it's job without shortening the life of the cells in the meantime





If you are storing the cells, then 3.7-3.9V for storage. If you are talking about future build and just asking questions if it's doable and right, then yes, you can charge 60A. The question comes in at if you tested those cells at 1A/cell. If you have a 60p pack, and they were all tested at 1A/cell, then you can safely charge at 60A (as long as the cells all performed well under the 1A charge)
 
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wim said:
Chargingto a bitlower thenthe specified voltage ( i.e. 4.10V instead of 4.20V ) is not only safer but you also gain in cycles.

And not much power to gain up there... ;)

Noted dude! Will probably do that in that case!

Need to stop watching a film whilst replying! Two of you guys squeezed in replies whilst I was taking ages to reply!


Korishan said:
It's like taking a vehicle engine and having 5500RPM vs6000RPM. Those 500rpms at that speed aren't going to give you a whole lotta HP.
I'd recommend the 4.1V, or even 4.15V, but not go higher than that. That also gives you a little floating room to let the BMS do it's job without shortening the life of the cells in the meantime

My god you guys are tooooooo quick hahahhaa :D

Yep 100% get it! taken onboard and will stick to charging to 4.1 @60A :)

See this is why I ask!

And all Cells are being tested at 1A, 4 at a time......... Its taking ages dam it!!!!
 

Korishan

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IAMJAMESMANNION said:
And all Cells are being tested at 1A, 4 at a time......... Its taking ages dam it!!!!

I hope you mean you have 1 charger that holds 4 cells at a time and each cell is charging at 1A; and not 1 slot that has 4 in parallel charging at 1A, because this would be 250mA per cell.
I'm gonna guess you mean the former ;)
 
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