can you give us some details on those battery's mike? they look like a great way to go
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
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
Is a 1C discharge rate a problem for a motor bicycle?
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
So you're going to need 20 of them? 64v ?
Are you concerned about the 1C discharge rate. That seems like a slow rate. Won't there be a lot of voltage sag at wfo?
Keep in mind I only barely know what I'm talking about here.
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.
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.
To get near 100A it's gonna need 75 of those 3.2V cells at ~30V...
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?To get near 100A it's gonna need 75 of those 3.2V cells at ~30V...