72 volt battery

[Jonah007]

Hi,
I am planning my next build, 3000 watt hub motor, 150 amp controller ,
Do I need to find high discharge rate batteries with a 150 amp BMS, ???

My current bike has a 3000 watt hub motor, 72 volt system, 80 amp controller and I am topping out at ONLY 70 KPH, On 26" wheels.

My batteries are generic with no info. ( 6x 36V) each pack with it's own BMS.)
I had to put in a battery cut-of switch as I was losing 1.5 volts a day when switched off, Now it works fine with minimal discharge.

So I am looking for a higher top speed, A 150 amp controller will help, I am not sure on the batteries,?? This time I want to go with a pre-built pack, Rather than wiring my own packs, So are there battery packs with a 150 amp BMS OR am I out to lunch with my thinking,??

 

[john61ct]

The two factors are

total Ah capacity, determined by how many cells in parallel, and

peak current required, short bursts

vs continuous max, say 5-min at a time

The max amps of the BMS has little to do with the actual power needed by your motor / controller and use case factors.

Say the pack is only 10Ah, but you need 100A peak and 50A continuous.

That is 10C and 5C respectively

probably better to expand the size of the pack if possible.

 

[999zip999]

How many turn is your motor ? Who made the motor ? Is it 45mm stator ?

 

[ZeroEm]

Something to think about. My 72V battery has a switch to drop it down to 36V, this is used when plugging and unplugging to keep the arch down.

 

[Jonah007]

Hi,
I am new to this forum and thank you for the replies !!

No, The battery does not have a step-down switch.

The motor is a C & N manufacturer, Bought as a complete kit, with display,controller,wiring,wheel, etc.

And as usual on Aliexpress, There was no instructions on how to set up/use the display etc. Nor actual technical info.
on the motor, Except general sales info.