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Moped Battery Build
#11
Wow I love that website. Thanks man.
I got the motor and controller yesterday and was looking at the power chart and the length of cable it I will most likely only draw around 96 amps. I can limit it with the software the controller comes with. The data table is linked here.  72v motor PDF if I can use 10 gauge high temp wire I think I’ll do that.
Would this wire work? Amazon link

Thank you!
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#12
Hey everyone, what charger would you suggest for my 2 batteries that I built with 36v-10ah battery packs with an Anderson connector? I am not running a BMS.
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#13
(09-26-2018, 07:25 PM)knightgreider Wrote: Hey everyone, what charger would you suggest for my 2 batteries that I built with 36v-10ah battery packs with an Anderson connector? I am not running a BMS.

The iCharger 1010B+ is capable of charging up to 10s. There are clones out there that may be a little cheaper. But if you shop around you should be able to get the iCharger at a reasonable price. I bought a Charsoon Antimatter charger, because it was almost half the price of the iCharger. I have no complaints so far.

My chargers are only 6s, but I have 3 of them. If I need to charge more than 6s, I just use two chargers.

Most larger chargers require an external power supply. I prefer to go this way, as secondhand server power supplies are often cheap. However, if you want to charge at the full 300w you will need more than the 12v most server supplies have. You will be limited to about 250w. This would not matter if you were charging at 0.5c, as 5a @ 36v is only 180w.

(08-17-2018, 05:52 PM)knightgreider Wrote: Wow I love that website. Thanks man.
I got the motor and controller yesterday and was looking at the power chart and the length of cable it I will most likely only draw around 96 amps. I can limit it with the software the controller comes with. The data table is linked here.  72v motor PDF if I can use 10 gauge high temp wire I think I’ll do that.
Would this wire work? Amazon link

Thank you!

Amazon link is broken.
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#14
Thanks I am looking at that charger when I build my new pack.

So... I am starting from scratch with another pack, I just bought 80 of these https://www.imrbatteries.com/samsung-33g...p-battery/ for a 72v - 25.2ah battery pack. I am a bit scared because I might be drawing too many amps per cell. When I bought them last Friday (they didn't ship yet) I thought 6.5a draw would be ok for each cell because I thought the amps were drawn from each battery. So little more 1amp per cell max. But now I think (I could be wrong). Would I be drawing from amps each of the series of batteries in the pack of my 8s10p pack, which would be 11.75amps a piece. Is this right?

According to this data sheet from my motor and controller (also the same as 48v vs 72v motor), it's drawing around 94 amps max (I hope) linked below.
https://www.goldenmotor.com/hubmotors/hu...20Data.pdf

Thanks!
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#15
(04-29-2019, 03:43 PM)knightgreider Wrote: Thanks I am looking at that charger when I build my new pack.

So... I am starting from scratch with another pack, I just bought 80 of these https://www.imrbatteries.com/samsung-33g...p-battery/ for a 72v - 25.2ah battery pack. I am a bit scared because I might be drawing too many amps per cell. When I bought them last Friday (they didn't ship yet) I thought 6.5a draw would be ok for each cell because I thought the amps were drawn from each battery. So little more 1amp per cell max. But now I think (I could be wrong). Would I be drawing from amps each of the series of batteries in the pack of my 8s10p pack, which would be 11.75amps a piece. Is this right?

According to this data sheet from my motor and controller (also the same as 48v vs 72v motor), it's drawing around 94 amps max (I hope) linked below.
https://www.goldenmotor.com/hubmotors/hu...20Data.pdf

Thanks!

This is from Your link :
 
6,5 A Max per cell.
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
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#16
What math should I do for max discharge?

Yeah, but what would be the max discharge on a 8s10p pack of 94a? I always thought the max discharge was evenly divided by the total number of cells... Now I am wondering if it is 11.75a or 9.4a?
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#17
(04-30-2019, 11:17 AM)knightgreider Wrote: What math should I do for max discharge?

Yeah, but what would be the max discharge on a 8s10p pack of 94a? I always thought the max discharge was evenly divided by the total number of cells... Now I am wondering if it is 11.75a or 9.4a?

Just think of the number of cells in parallel. (not the (total) number of cells)
6p -> 6 times 6.5 Amps ...
10 P -> 10 times 6.5 Amps, so it is 65 Amps max per specification.
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
Reply
#18
I'm not saying I know what I'm talking about, cause I've never built or used an e-bike. I think you're better off using high drain cells like the Samsung 30Q. Even though the ones you bought may be rated for 6.5A, the performance suffers. So you wouldn't want to max out your therotical amps. Without the high drain capabilities, the voltage drop during high loads may be significant causing premature cut-offs. I can see if you try to go full throttle you will find that the bms will cut off due to a low battery condition, then come back on again when the cell voltage recovers. The only way around it is to add more cells in parallel.

I wonder if there's options for dual chemistries, like a supercap or high charge/discharge chemistries where the supercaps are used during bursts of high speed throttles.
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#19
(04-30-2019, 03:10 PM)not2bme Wrote: I'm not saying I know what I'm talking about, cause I've never built or used an e-bike. I think you're better off using high drain cells like the Samsung 30Q. Even though the ones you bought may be rated for 6.5A, the performance suffers. So you wouldn't want to max out your therotical amps. Without the high drain capabilities, the voltage drop during high loads may be significant causing premature cut-offs. I can see if you try to go full throttle you will find that the bms will cut off due to a low battery condition, then come back on again when the cell voltage recovers. The only way around it is to add more cells in parallel.

I wonder if there's options for dual chemistries, like a supercap or high charge/discharge chemistries where the supercaps are used during bursts of high speed throttles.

All what you say may happen.
You mention  a BMS Undervoltage Cutout - as far as i have understood the OP said he doesnt want to use a BMS. Very bad idea, given the case that cells might get temporarily undervoltage just by to high drains, as you describe. This board here has several people doing a powerwall running without BMS - and loosing a bank to under- (over-)voltage (lucky guys, if they only lost a bank).

For my personal taste, the battery is just to small for the task - its weight is (my guessing) even less what the fuel (i assume is a bike project) might have had in comparison.
But, thats not a go-nogo criteria, its just what disadvantages of cell overloading the OP is willing to take.
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
Reply
#20
I will be using a BMS for this new pack actually. I bought the wrong batteries, and they are not returnable. So I will be needing to sell them so I can purchase the 15a max draw now battery now. I also figured out why my pack shorted. I was running 80 of these. https://secondlifestorage.com/t-LG-LGABB...ifications

Before now I didn't understand thoroughly what continuous draw actually matters for the motor. Since I have the moped put together, I rode it twice and probably blew the fuses because I was drawing too much power. That's why out why it was bogging down. I thought it was my brakes rubbing...  Sad Now I'll order these batteries for the 9.4max draw so I won't be bogged down and fully accelerate. 

The link above is the 30Q batteries that not2bme suggested. Does anyone have an active BMS suggestion for an 8s10p pack? I haven't done a BMS yet, I know there are a bunch of videos out there which I will be going through. But I'm interested to see what everyone suggests. 

So now I just need to sell the 80 of these that I bought. Does anyone want them for less than I paid for them? My loss. https://www.imrbatteries.com/samsung-33g...p-battery/

Thanks for your help everyone!
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