DIY 80ah 18650 battery cell test EBC-A20 for power supply

Using our EBC-A20 battery tester to see if the new DIY 18650 battery dell build meets specifications
EBC-A20 Battery Tester - amzn.to/3S8Kzop
Software download - off-grid-garag...
The link above is for the software, it's from "off grid garage". Which I have learned so much from over the last two years regarding batteries.
Thanks again and happy battery building
KJ

[@vinniec5286]

Hello. I found your channel last night and have watched all the videos up to this point. I may be missing something but how did you calculate the 5amp draw? Do you have a specific load? I have the same 800watt 24V inverter. If I am doing the math right, 800watts divided by 25 volts is 32amps max draw. What am I missing? I am also enjoying this series.

[@TheosDragon]

He mentioned he has 7 of these giant battery pack cells connected in series. So he has a 7s40p configuration. Where each giant cell has 40 in parallel. So you need to divide the load by the 7 cells in series. So 32/7 =~ 4.57amps which he rounds up to 5.

[@vinniec5286]

@@TheosDragonI just watched the first minute again. I missed it the first time, where he was using a ZKE to test discharge and had it set at 5amps draw.

[@TheosDragon]

Hey there thanks for the video. I have a question for you. So I’m making a 14s4p battery for my ebike. The motor draws 25amps at the peak. So does that mean each of the cells sees a load of 25/4 = 6.25 amps ? When I use this same tester on my batteries. I tried testing one cell with 7amps discharge rate and the test ends? Is that due to the battery not being able to take the load and stay above 3.7v? I’m starting the test at 4.2v.
Also do I need to test 20 amp draw on 4 cells connected in parallel?

[@stepbystepbacktobasics2731]

That can vary a lot depending on which cells you are using. Are you using 18650 cell? and again that can vary based off how many amps that particular cell can produce if the cells are producing, say, 1.55 amps. Yes, you would be correct.
So you're trying to make a 48 volt battery with 20 amps. A 20 amps draw is possible with this setup. If you have the right cells and the right at minimum 30 amp BMS and use 10 awg wire and again this all depends on your cells capability. I would need to see the spec sheet.
Because if you're drawing directly off the battery pack without a BMS and these are one amp cells or 1.5 amp cells. Once you hit 6 to 7 amps it's going to max out. Because remember you only have 4 cells in parallel and if they're 1.5 amps each, that's 1.5x4 that 6amps.