Minimum amp

What is the minimum mAh to 'accept' a 18650 in your powerwall

  • 2500 or more

    Votes: 4 12.1%
  • 2000

    Votes: 15 45.5%
  • 1800

    Votes: 7 21.2%
  • 1600

    Votes: 2 6.1%
  • 1400

    Votes: 3 9.1%
  • 1200

    Votes: 2 6.1%
  • 1000

    Votes: 1 3.0%
  • 800

    Votes: 0 0.0%
  • all of them

    Votes: 1 3.0%

  • Total voters
    33

hbpowerwall

Administrator
Staff member
Joined
Oct 7, 2016
Messages
1,912
Do you mean mAh ? 2100 for me .
 

3nergE

Member
Joined
Dec 3, 2016
Messages
101
I base my min off the original capacity of the cell. So if Im using new 1800s (like reclaimed replacment batteries) ill use 1800, but if they are say samsung 30b (3000mAh) then 2100-2200. I find that if its below 70% of the original the cells start to get a bit wiggy.
 

3nergE

Member
Joined
Dec 3, 2016
Messages
101
I have to call back to my original post, dont do arbitrary capacity minimums, have a % of original design capacity as your minimum.
A 2100mAh minimum on first a cell that was 3400mAh compared to a cell that was originally 2400mAh are two entirely different beasts.

By design, manufacturers slate 70% of original as their 'throw away' point. Im inclined to be more optimistic on cells that started at higher capacities.

The long and short is its a good idea to test what different cells do.

Lastly, remember that capacity also affects the C rates for charge and discharge, so as a cell declines you need to account for changes in tolerances to stop the cells 'falling off the edge' quicker.

kind regards
 

daromer

Moderator
Staff member
Joined
Oct 8, 2016
Messages
5,564
My good packs are 2000-2400mAh as i have thousands of them. But im also going to build some smaller packs of 1800+ when they ar done since i have plenty of those 2.

I would say it all depends on what you got and how much time you have to spare for building.
 

Crimp Daddy

Well-known member
Joined
Feb 21, 2018
Messages
964
I voted 2000, but I am trying to keep it 2250 or higher. Most of my cells so far are 2500-2900 mAh but those were the better ones I got from non-laptop sources.
 
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