Do you use these in your builds

EGOksy

EGOksy

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Jan 20, 2018
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I have a bunch of these 18650 from replaceable batteries "No brand".

image_hlssti.jpg


Almost all of them have quite nice mAh .. like 2100 - 2300.
Some of them are marked as made in Canada .. some from Taiwan the res i guess China.

Have anyone used them .. and how they performed ?

Thanks
 
If they pass testing phase I use them. I dont care of brands nor color as long as they work. If 1A discharge and charge test works fine and capacity is fine I know they work in my powerwall where max load is 200mA...
 
daromer said:
If they pass testing phase I use them. I dont care of brands nor color as long as they work. If 1A discharge and charge test works fine and capacity is fine I know they work in my powerwall where max load is 200mA...
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max load of 200mA is low for my use :) plan to use all with 1 A but up to 1.5-2A loads. ok will need to test later :)
 
I got many thousands of cell and max load is like 20kW out.. But on all my cells thats not much :p
 
daromer said:
I got many thousands of cell and max load is like 20kW out.. But on all my cells thats not much :p
Click to expand...

my plan is to build 13s and for starters 80-100p its limited space and i can max out to 2350 cells that i will do i think.
48V so 13s ~180p max.. maybe with some ingenuity i could get up to 200p will see :)
850 cells so far... 2000+
 
1) why 13s and not 14s? (maybe it's in your other thread)
2) with 100p your cells will still see 1A each? What kind of load are putting these through, launching an electric hovercraft?
 
I also suggest 14s
 
Korishan said:
1) why 13s and not 14s? (maybe it's in your other thread)
2) with 100p your cells will still see 1A each? What kind of load are putting these through, launching an electric hovercraft?
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1) Not decided yet on 13s or 14s it all depends on what dc/dc (48V to 240+V) boost converter i will be building :).
Higher input to converter is better. Don't know how these Voltage fluctuations are influential on converter output.
2) it's for my Prius Upgrade project... ;)
From 1 up to 2 or 2.5A Peak short <10s
 
LOL I wasn't far off then :p You puttin that much work into it, it better fly ;)

I think 14s would work better for the booster than 13s. The higher the input voltage, the easier the booster can work.

However, with that said, for electric vehicle, personally, I think you should build system voltage packs and forgo the converter. Not only does it give you small wiring to work with, but you won't be loosing a bunch to conversion. Even 90% efficient conversion rate is still loosing 10%, which can be big deal in electric vehicle.

but that's my take on it.
 
Korishan said:
LOL I wasn't far off then :p You puttin that much work into it, it better fly ;)

I think 14s would work better for the booster than 13s. The higher the input voltage, the easier the booster can work.

However, with that said, for electric vehicle, personally, I think you should build system voltage packs and forgo the converter. Not only does it give you small wiring to work with, but you won't be loosing a bunch to conversion. Even 90% efficient conversion rate is still loosing 10%, which can be big deal in electric vehicle.

but that's my take on it.
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Yes it would be great, and it is possible, ~67s35p. But i still need constant 240V output and charging ... regenerative charging, BMS . There are more solutions for 48V in EV community then higher voltages..
Not decided yet :) will see, still gathering info
 
You could probably combine BMS systems to fill out the higher string.

240V / 48V Strings = 5 BMS strings

So you could use 5 BMS systems and tie them all to their own section and they'll keep their section balanced. If you charged to max each time, you shouldn't get any drift from the sections. Set each BMS to 4.1V (example) max, charge to ~270V total, and the BMS should keep the cells balanced. I would test on a small scale first, of course, to verify.

Just a thought
 
Korishan said:
You could probably combine BMS systems to fill out the higher string.

240V / 48V Strings = 5 BMS strings

So you could use 5 BMS systems and tie them all to their own section and they'll keep their section balanced. If you charged to max each time, you shouldn't get any drift from the sections. Set each BMS to 4.1V (example) max, charge to ~270V total, and the BMS should keep the cells balanced. I would test on a small scale first, of course, to verify.

Just a thought
Click to expand...

min 3V max 4V ~80% capacity will be used thx :) will see
 
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