Battery pack evaluation

As you will see, I’ve labeled our battery packs A & B, just to have some easy recognition for those when charging etc. I brought Risa the battery pack B as he agreed to test those battery packs for us. So all his findings below & huge thanks!!

Battery pack A – tested 10/12/2020 – 16/12/2020

Initial setup for Battery pack A
Battery pack B test result

Risa’s comments:

BMS was cutting out at I think ~17.4V
/6 = 2.9V per cell
full charge cut out at 25V
/6 = 4.166V
18.46Ahr / 5 = 3.69Hhr per cell

Battery pack B – tested 25/11/2020 – 30/11/2020

Initial setup for Battery pack B
Battery pack B test result

Risa’s comments:

BMS was cutting out at I think ~17.4V
/6 = 2.9V per cell
full charge cut out at 25V
/6 = 4.166V
17.6Ahr / 5 = 3.52Hhr per cell

Results

Battery pack ABattery pack BSum
Test length27h 1m28h 09mN/A
Ah max18.46Ah17.63Ah36.09Ah
Wh max402.38Wh384.23Wh786.61Wh
Ah per cell3.69Ah3.52Ah
Weight2.487kg2.487kg4.974kg
Results table

Having both batteries ready we should be now handling quite reasonable 36Ah. Provided that I estimate peak consumption to be 40A, we should be able to go up to 50 minutes full speed with our Jet-cart now! Let’s say that we’ll go 1/2 power average, we can probably go for almost 2 hrs.

I think this is a good start and reasonable promise that we’ll be able to put together enough power (with reasonable power/weight ratio) to make it to another stage!

I’ve asked Risa to provide his summary on all this, so take this paragraph as a placeholder for Risa’s epilogue. 😉

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