1000w battery 2000w motor

[dukodos]

Hi
I’m just wondering if anyone can offer advice.
I have a 2000w motor and 50amp 2000w controller both 48v.
I didn’t realise that batteries were also rated in watts (the battery I have is rated 1000w lithium)
Will I be limiting the system power with this battery?

It’s for a gokart by the way , I’ve built a few custom e bikes using the same battery 48v 1000w 20ah but with 1000w motors and controllers.

Do I need a new battery or will it cope

Cheers

I couldn’t find a similar question anywhere

 

[flymeaway]

W=V*A
What's more important is the C rating, which defines how quickly a battery can delivery power. Here's a very good explanation of battery terms:

http://web.mit.edu/evt/summary_battery_specifications.pdf

 

[dukodos]

Thanks for that. The manufacturers all say it’s compatible and I’m sure it will run fine I’m just curious if anyone has run a similar setup where the battery is not rated as high in relation to the controller : motor

So
48v x 20 amp = 1000w (which is what battery I have)

But the controller and motor are rated
48x 40 amp = 2000w

 

[indianajo]

Thanks for that. The manufacturers all say it’s compatible and I’m sure it will run fine I’m just curious if anyone has run a similar setup where the battery is not rated as high in relation to the controller : motor

So
48v x 20 amp = 1000w (which is what battery I have)

But the controller and motor are rated
48x 40 amp = 2000w

Usually the quoted rating on the battery is AH amp hours, as a 21 AH battery. Thus the watthour rating, which is a bigger number set to impress the inexperienced, is 48x21 or 1008 wh.
wh is an energy rating which correlates to miles produced or gas tank size. w is a power rating which correlates to ability to lift how much weight up how steep a grade.
bike motors are advertised in watts, which is how much electricity they will consume. However they actually produce less watts, which is force exerted on the road times distance. So my 1200 watt hub motor will consume 24 amps at 50 v, but actually will lift 330 lb up a 15% grade @ 6 mph, or 340 watts.
I measured the weight with a couple of bathroom scales, and the 15% grade with a 6" long level and a machinist's ruler.

 

[dukodos]

Thanks for that, yes it's a little confusing . I've only just started looking into the amp / watt rating of the battery (not amp hours)


if you look here you can see this 48v battery is rated 1000w

83.81US $ |48v Lithium Ion Battery 48v 28ah 1000w 13s3p Lithium Ion Battery Pack For 54.6v E-bike Electric Bicycle Scooter With Bms+charger - Battery Packs - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

but for a 2000w 48v battery (similar ah capacity) it's a lot more expensive nearly 10x the price for 2000w

397.8US $ 15% OFF|48 Volt Lithium Battery 48V 1000W 1500W 2000W Battery48V 30Ah 35Ah 40Ah 45Ah 50Ah eBike Battery 48V 50Ah Electric Scooter Battey|Electric Bicycle Battery| - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

I was mainly curious what the performance difference would be with a 2000w motor .
I don't fancy shelling out £500 to test either

 

[harryS]

if you look here you can see this 48v battery is rated 1000w

83.81US $ |48v Lithium Ion Battery 48v 28ah 1000w 13s3p Lithium Ion Battery Pack For 54.6v E-bike Electric Bicycle Scooter With Bms+charger - Battery Packs - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

The first listing is a scammer telling you a big lie. The details say it's a 13S-3P battery, 13 series groups with each group having three cells in parallel . The AH rating of a battery will be the total AH rating of those three parallel cells. 20AH? Divide 20 by 3. That would require cells with a 9.1AH rating. The best cells in the world are about 3.5AH. It's fake. It's awful. Don't waste your money.

Further down in the details, they say it can do 13A continuous. That would be about 4.3A per cells, which is probably what you get out of laptop cells. This battery is pretty weak at 13A. Most 500W motors will want 20A when you pull the throttle.

The second listing is more factual. Look how much bigger the pack is. They're putting 8 or more cells in parallel. Still using lower cost cells though, but not as low cost as the first one.