72V 100A 60Ah 4.3kWh 10s24p 200lbs.....
- Thread starter miked826
- Start date
Yep. They're LiFePo4 cells used for EV buses, trucks, cars and trains. They are even somewhat affordable as far as batteries go.
CALB 40 Ah CA Series Lithium Iron Phosphate Battery
[CALB-CA40]
http://www.evwest.com/catalog/product_info.php?products_id=177
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That 1C is for a single cell (3.2v), which will be multiplied by 20 cells in my case. You can't kill this battery in multiples with any normal controller. These batteries are made for massive city transit bus controllers. They don't have the ability to burst into a ball of flames if abused like LiPo do and will if you simply give them a wrong look. LOL
My motor is good from 24-72 volts. My ammo cans combined can hold 18 of those batteries. My controller will be set to 100A. Those batts are fully charged at 3.6v. So I'll have 64.8V, 40Ah, and 6480 Watts. That should do me for now. I got room for more batteries between the 2 cans if needed.
Only concerned if I was only gonna be using 1 of these batteries. I'll have 18 of these batteries and their continuous combined "C" rating will easily exceed 100A . 1C on this single battery is probably 40A. 40 X 9 batteries in parallel is 360A. Those 9 batteries, can at minimum, safely dump, momentarily, 360A into a motor. They are LiFePo4. I have no worries about them, unlike the LiPo Firestarters I was looking at. LOL
The sheer size of this battery and the fact that it only puts out 3.6V and weighs over 3lbs tells me only 1 thing. That it is designed to release massive amounts of amps. It is the exact same size as the 36V LiPo pack but only puts out 1/10 the voltage. It's amp rating has to be 10X the size of the 36V 4A LiPo pack. If it's gonna power trains and city buses then it makes perfect sense that it be constructed that way.
9 of those batteries in series will get you 28.8V, 80 Amps max discharge, 40Ah, max cycles to 80% capacity at .3C, which is 12 Amps for that particular pack.
You need to go off the specs, not what they look like, especially at the cost involved.
You need to go off the specs, not what they look like, especially at the cost involved.
You are giving nominal specs. 3.6V x 9 = 32.4V per the specs. Maximum discharge current is "2C" per cell x 9 cells = 18C per specs. C=40Ah. Maximum momentary discharge is 720A. It is good to go by the exact specs. LOL
http://www.evsource.com/datasheets/BatteryData/CA%20Series%20Catalog%20-%20Available%20%281%29.pdf
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If you look at the curve, the batteries will spend most of their time at about 3.3V, which 9 of them in series will make about 30V.
If you want to get your money's worth (2000 cycles @ 12A) then 30V x 12A = 360W, which isn't enough for an electric bike to take off from a stop without pedaling, and won't go more than 15mph.
Sorry to break the news to you, electrics are all about carefully reading the spec sheet (with a skeptical eye, made in China after all) and doing the math. If you discharge the batteries at 2C constantly they might last 20-50 cycles.
If you want to get your money's worth (2000 cycles @ 12A) then 30V x 12A = 360W, which isn't enough for an electric bike to take off from a stop without pedaling, and won't go more than 15mph.
Sorry to break the news to you, electrics are all about carefully reading the spec sheet (with a skeptical eye, made in China after all) and doing the math. If you discharge the batteries at 2C constantly they might last 20-50 cycles.
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I just want to see how many miles you'll get per charge. From what I've read on the spec sheets, I think you'll be reaching 60+ miles on a charge. If anything Mike, you could probably put a 6 more cells in front of your motor. That would make your bike more balanced and improve the handling. Are you going to add a BMS?
As for China made batteries, I have 3 and I've haven't had any issues with them. In fact I'm being conservative when I say at least 80% of the batteries are made in China or Tawain.
As for China made batteries, I have 3 and I've haven't had any issues with them. In fact I'm being conservative when I say at least 80% of the batteries are made in China or Tawain.
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I never said constantly which is why I specifically typed "momentary". LOL 1C nominal discharge = 40A. .3 of that is 12A per cell. 9 cells = 108A nominal. And I didn't even need a calculator to figure that out.
The specs are given for a single 3.2V 40Ah cell and 9 of those cells will give you 108A. What kind of calculator are you using? LOL
I've been looking at the spec sheets and what part are you looking at to come up with your conclusion? Maybe I'm not fully understanding the sheet but are you getting the info off the normal capacity discharge at .3C?
Thanks
Here ladies and gentlemen we have a 10 cell 37V 4Ah LiPo battery pack. 10x times the voltage and 1/10 the Ah of the CALB single cell 3.6V 40Ah battery and the weight is exactly the same. What a coincidence ay? The wattage output is nearly identical. LOL
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