How many amp/hours battery?

[screechefi]

What battery do I need for 1 hour of continuous use?


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MY CONTROLLER
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Model KT24ZWP Max Current 16+-1A
Input Voltage DC24V Speet set 1-4.2V
Min.Voltage DC20+-0.5V Brake Input: Low-Level

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THE HUB MOTOR
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YouE Motor about 5 inches in diameter

Purpose is for a school girl to ride to school and back home. 8 km trip per day.

I bought a whole 24volt kit minus a battery.
The kit is supposed to be a street legal 200 watt systerm, but no documents to prove it.

Why does the controller say max current of 16 amps?
If it sends 16 amps to the motor then its sending out 380watts?
"doesn't 200w/24v=8.33amps?"
What is going on here?
Is this a 200watt system or 380 watt system?
Do I need a least 16 amp hour battery or a 9 amp hours battery.
What battery do I need for 1 hour of continuous use?

Just waiting on your expert advice so I can order the battery.
photos are on there way.
Thanks

 

[dogman dan]

Depending on your pov, it's a 200w or a 400w. What will happen in practice, is you pull 400w only briefly, and likely cruise at about 200w. 200w gets you about 15 mph, so its a "200w kit".

Other kits, perhaps intended for sale in a stricter place, might actually have a 200w max amps, and a tiny 8 amps controller.

Both kits would go about the same speed, since that's primarily limited by the voltage. So don't sweat the extra amps. It just helps you get up hills, and up to speed quicker with no harm done.

Either battery should work ok, but of course you get more range from a 16 ah battery. The 9 ah battery is likely to be capable of providing 16 amps of current. Amps and amp hours are not the same thing.

 

[screechefi]

If I have the throttle on max, will it give me the 16 amps all the time or just for a brief period?

Whats is "pov?"

 

[shorza]

POV = Point of view

That would be classed as a 200w kit. It is normal for the controller to pull 16a for a couple of seconds while taking off, but as Dogman said, it will level out to 200w.

Not sure where you are from (you should edit your location) but if you are an Australian, it is street legal.

 

[screechefi]

cool, thanks.

I've just ordered a Li.Fe.Po4 10 amp/hr water bottle battery.
Will look sweet!

 

[jateureka]

Just make sure the battery is rated for a peak discharge current of 17A (16A +1A), for the 10Ahr battery that would be 1.7C peak/max.

 

[screechefi]

Just make sure the battery is rated for a peak discharge current of 17A (16A +1A), for the 10Ahr battery that would be 1.7C peak/max.

yes, the battery specs say
Normal working current:15A
and Maximum discharge current:40A

thanks

 

[d8veh]

The throttle controls the speed, not the current. The faster you go, the less current will go into the motor. You'll only get 16 amps at very low speed when you're hill-climbing and starting from a stop.