Battery pack 60V

[Albertosca]

Hello everyone, I'm aitalian so if I cannot explain properly that is the reason
Anyway let's introduce a bit my self and my little fantasy here.
I want to build a big battery pack in voltage and powerful enough to give the maximum power to my 1500w rear hub of my bicycle.
I bought everything last year, bike, battery and a conversion kit to ebike.
The little problem is I did not really know much about the world of ebikes so naively I had a quick look and bought everything relaying on what some people said. So I have bought a battery which is 15 Amp 48v, By calculating some "ebike math" this battery gives only 700 watt to my motor.
If that theory is wrong and according to the theory which is calculated by the voltage of the battery times the amps of the battery.
So this is my clue, What do you guys think about it? Also i want to add a little question, I have 13 battery 186050 which they are still ok got them from 2 of 2 battery power tools, If i connect all those 13 cells in Series, they will give 48v let's just say, to recharge can i still use my normal charger which is 48v 2 Amp? Or Is best to charge singulary? Because I want to have a small back up In Case my battery runs down and I'm far away or I forgot to recharge and etc.

 

[amberwolf]

So I have bought a battery which is 15 Amp 48v, By calculating some "ebike math" this battery gives only 700 watt to my motor.

the batteyr doesn't give any watts to the motor.

the controller does that.

what controller do you have? what is it's current limit? that is what determines the power to the motor.

if you have a 48v 10a controller, then the motor only gets 480w max. (it may peak higher for a moment at startup, but the ocntroller will quickly start limiting and reduce to this).

if its' 48v 20a, then the motor gets 960w max.

keep in mind that the max watts a system is capable of are not usually seen except at startup from a stop or during hill climbing, or faster speeds where the air drag slows you down if you don't use more power.

If that theory is wrong and according to the theory which is calculated by the voltage of the battery times the amps of the battery.

is the battery 48v 15ah? amp-hours ah are completely different from amps.

amp hours are capacity. (so are watt hours wh)

amps are current delivery capability.

watts are power delivery capability.

if you have a battery that is rated 48v 15ah, then it has 700wh capacity, meaning if it takes you around 10wh/mile you could ride for 70 miles before it empties if it was full. if it takes 20wh/mile you could ride for 35 miles.

how many wh/mile it takes to ride depends on how fast you go, how hard you like to accelerate, how often you have to stop and start, what kind of hills you have to climb and how heavy you and the bike are, and what kind of winds you have to ride against, among other things.

if you have a battery that is 48v, and is rated to output 15a maximum then that means at most it can handle 15a, but it doesnt' limit that itself--your controller has to do the limiting. it means that at most it could handle 700w output before it starts having problems, too much voltage sag, too much heat generated, too hard on the cells so they age faster than they should and die sooner.

if the 15a is a peak maximum, then using it that hard all the time will age it pretty quickly, and it wont' last very long. if the 15a is a continuous maximum, then using it that way should be normal for it.



if the controler and motor you have is a 1500w system, then the controller current limit shoudl be about 32a. if it is, and that's a 15ah battery, then that's only 2c (two times the capacity, or c-rate) for that battery, and many batteries can handle that ok. not all of them, some sag in voltage a lot so you don't really get as many watts but it's still close.




so...if you can give the complete specs for your whole system, battery, motor, controller, etc., then we may be able to help you find the actual limit that's holding you back from doing what you want to do.

we also must know exactly what it is you want to do. how fast you want to go, what conditions you ride under, are the roads flat, hills, how long how high, your weight plus the bike and any cargo/etc you carry, weather (winds), road conditions (paved, gravel, sand, grass, etc), do you like to ride hard, accelerating as hard as possible from every stop, or gradually, do you like to pedal and how much, etc. every detail you can think of may help us help you.

 

[Albertosca]

I'm sorry I haven't said it but the controller is 1500w.
I bought the kit which includes everything to convert a bicycle to ebike and both motor and controller are 1500w
So or I make a battery which is 2 series of 13 cells, 16 in total which each cell contains 2500 mA, and the Total voltage of the battery is going to be 48v 65A with a 3000w for my motor.
Otherwise I make a battery with 2 Series of 16 cells, 32 in total which again each cells is 2500 mA and the battery pack will be 60v 80A 4800W .
My controller is 1500 w 48V but I saw someone opened it to check how much the maximum voltage it can get from a battery and it was 63V, so the reason why i want to make a 60v battery is because the motor can handle amore than 48v, and it'll be more powerful then a regular 48V. What do you guys think?

 

[Albertosca]

Btw the conversion kit is a Voilamart 1500W rear hub and the controller which came with the kit i do not know because there are no description ls about it, if there is a way to check i will, but I'm assuming has to handle a bit motor ....!
On the website where I've bought the kit there are the descriptions which says this

1.The system requires a 48 Volt electrokinetic cell battery with a nominal capacity not less than 14.5Ah.

SPECIFICATIONS
Wheel type: Rear Wheel
Motor: Brushless Gearless
Tire: Nylon
Rim: Alloy double wall
Power: 1500W / 48V or 250W / 48V
Torque: 45 N.M
Spokes: Steel, 12G×2.6mm
Max speed: 34 mph or 16 mph
Wheel Size: 26"
Max load capacity: 250kg
Net weight: 11.16kg
Wheel Axle: 210 x 10mm

Hopefully it'll help understand



And the battery i have is 48V 15A

 

[zeccato]

.........
So or I make a battery which is 2 series of 13 cells, 16 in total which each cell contains 2500 mA, and the Total voltage of the battery is going to be 48v 65A with a 3000w for my motor.
Otherwise I make a battery with 2 Series of 16 cells, 32 in total which again each cells is 2500 mA and the battery pack will be 60v 80A 4800W .

questi calcoli non li capisco.

Se vuoi più potenza devi dare più ampere,
o Watt (che sono V x A), e non è necessario avere 60 volt.

Se la tua batteria è 1c, ti servirebbe minimo un'altra.
e vedere se puoi modificare il controller,
dipende dal tipo.

I don't understand these calculations.
If you want more power, you have to give more amps,
or Watts (which are V x A), and you don't need to have 60 volts.
If your battery is 1c, you would need at least one more.
and see if you can modify the controller,
depends on the type.

 

[Albertosca]

What do you think is best, 60V 80A or 48v 65A for my motor? Because if i get the cells from Samsung which are 2500 mA, they should be good isn't it?

 

[markz]

What do you think is best, 60V 80A or 48v 65A for my motor? Because if i get the cells from Samsung which are 2500 mA, they should be good isn't it?

You choose battery voltage/amperes from the controller voltage/amps, you buy the controller to the speed you want hence voltage. Also dont forget you will need a charger to charge the battery. Costs involved in that too.
Samsung has many different models of 18650's but yes they are a good manufacturer. Better then the no-name stuff like

Acebeam BG (1) EagleTac (2) EagleTac (2) Heter (3) K-tech (1) Keeppower (12) Molicel (1) Nitecore (11) Olight (6) Xtar (3)

 

[Albertosca]

I said I don't know the Amp of my controller, is there any way to check it? On the description of the controller on the website where I got it from doesn't say at all, only says it needs a battery no less than 14.5 Am .
Anyway for the battery are good those ones I'm going to buy? How come when there are so many battery packs usually are so big and they don't contain many Amp, and with the cells I'm going to buy if i make a battery pack with them is going to be small? Menas they use bad or low quality cells? Ths cells I'm going to buy are those ones, here are the specs

18650 battery for Samsung Original INR18650 25R 20A discharge lithium batteries, 2500mAh electronic cigarette Power Battery

 

[SlowCo]

I said I don't know the Amp of my controller, is there any way to check it? On the description of the controller on the website where I got it from doesn't say at all, only says it needs a battery no less than 14.5 Am .
Anyway for the battery are good those ones I'm going to buy? How come when there are so many battery packs usually are so big and they don't contain many Amp, and with the cells I'm going to buy if i make a battery pack with them is going to be small? Menas they use bad or low quality cells? Ths cells I'm going to buy are those ones, here are the specs

18650 battery for Samsung Original INR18650 25R 20A discharge lithium batteries, 2500mAh electronic cigarette Power Battery

Before trying to build a battery please learn the difference between V, A, Ah, W, Wh, etc... :wink:
Because you don't seem to understand much of it.

 

[Albertosca]

I don't seem to understand much of it that's why please someone can tell me please? I've been asking same question, please someone helps? I said all the information now

 

[markz]

I don't seem to understand much of it that's why please someone can tell me please? I've been asking same question, please someone helps? I said all the information now

Its basic info, but we are all lazy and I've been in the same boat as you.
Volts (V)
Amps (A)
Watt (W)
Amp-Hour (Ah)
Watt-Hour (Wh)

VxA=W
VxAh=Wh
Wh/Distance

https://www.ebikes.ca/learn.html
Look at the Learn section.

 

[john61ct]

The key to getting good info, is asking precise enough questions, and providing enough relevant background info.

 

[Albertosca]

How to know what kind of controller I have? I just know my motor with came with the kit is 1500w. I tried to look but it doesn't say anything on the controller

 

[zeccato]

(if there's more voltage, shouldn't the engine go faster?
Then what do you mean by that 1 next to the battery?

Yes + volt= + speed.
1c= it was about the continuous discharge c. of your battery, and I don't know how many are, continuous c and peak c (just a few seconds).

Send a message where you bought the kit to know the technical info,
or see serial numbers letters etc.

60A or 80A battery has hundreds of cells,
do the right calculations.
48v can have 13-16 series.
and parallels 13-16, and if 1 cell is 2.5A to have 60A you have to put 24 in 1 parallel, x 16 series = 384 cells.

I think you only need 20 or 30A at most, depends on how many miles of autonomy you want.

Si + volt= + velocità.
1c= riguardava i c. di scarico continui della tua batteria, e non so quanti siano, c continui e c di picco (solo alcuni secondi).

Manda un messaggio dove l'ha comprato il kit per sapere i dati,
o vedi i numeri di serie lettere ecc.

una batteria di 60A o 80A ha centinaia di celle,
fai i conti giusti.
un 48v può avere 13-16 serie.
e i paralleli 13-16, e se una cella è di 2,5A per avere 60A ne devi mettere 24 in un parallelo, x 16 serie = 384 celle.

penso che ti bastino 20 o 30A al massimo,
dipende da quanti km vuoi di autonomia.

 

[Albertosca]

Sorry I thought battery packs are calculated by reaching 48 V which it includes 13 Cells in series and to get more Amp needs only to put more cells in parallel, and if a normal math is : 2.5 A per each cell and if we do times 13 cells it'll reach 32.5 A. doesn't it work like that for the battery packs?

 

[zeccato]

Sorry I thought battery packs are calculated by reaching 48 V which it includes 13 Cells in series and to get more Amp needs only to put more cells in parallel, and if a normal math is : 2.5 A per each cell and if we do times 13 cells it'll reach 32.5 A. doesn't it work like that for the battery packs?

your 15A has 6 cells in p., to have 32.5A you should add 7 cells x 13 = another 91 cells

la tua di 15A ha 6 celle in p., per avere 32,5A dovresti aggiungere 7 celle x 13 = altre 91