sizing battery for ebike

[pedronomix]

Hi

I have a 48v 1000w front hub kit that draws a max 25Amps. What capacity Ah battery is required to run this?

Thanks for any info

P

 

[Voltron]

That is going to depend a lot on what chemistry batteries you're using... but prob 12ah to 15ah for some good useable range.

 

[pedronomix]

http://zjzhenlong.company.weiku.com/item/lithium-polymer-battery-for-electric-bicycle-48V-10Ah-15559008.html I have one of these but was told that it would drop out if a 25amp load was imposed, perhaps that is not correct?

Thanks

Peter

 

[LockH]

"some good useable range". Yah. Still waiting re distances and terrains and environment to travel... per charge. (Time taken to recharge or pack swapped.)

 

[pedronomix]

It is just for faffing about locally, 5-10 miles but some quite steep hills.

 

[LockH]

Sigh. Gotta tease stuff out maybe. Just how deep IS that snow???

 

[pedronomix]

I dont use snow and it is not common in this neighbourhood!!

 

[LockH]

Hehe. Sorry (Canadian here.) So.
http://www.worldweatheronline.com/Dalkey-weather-averages/Dublin/IE.aspx

Pack kept toasty warm/inside when not in use?

(Also, enough power to hit U2 guys like Bono?)

 

[dogman dan]

In general, for your type of bike motor kit, a 10 ah battery would be the absolute minimum.

Your bike won't pull all 25 amps all the time. At fast cruise, likely it's pulling about 18 amps. Half throttle till 10 mph will take some of the sting out of the 25 amps pull at starts.

But you would expect up to an extra year out of a 15 ah, because each cell would be asked to provide 30% less current. So next time you buy one, look for a larger one.

With the battery, look for the best vendor, not the cheapest. Good cells, 10 ah will be plenty. Typical cheaper cells in the battery, get a 15 ah. Meanwhile, just feather the throttle till you get rolling.

There is a function in the forum, if you want to never see what a particular member posts.

 

[arkmundi]

http://zjzhenlong.company.weiku.com/item/lithium-polymer-battery-for-electric-bicycle-48V-10Ah-15559008.html I have one of these but was told that it would drop out if a 25amp load was imposed, perhaps that is not correct?

That web site does not list max discharge rate, a really big no-no, as it is a critical spec for batteries. I'd not buy a battery from any company that does not provide full specs, a guarantee and warranty. Its also lipo and there are safer chemistries available like LiFePO4. There are reputable companies providing batteries to our community and recommend you use them. See my post at Buyin a battery pack.

 

[pedronomix]

Thanks guys, I bought it eBay auction from a vendor in Germany. I now know I probably bought the wrong pack, so I will try it out and only use pedalassist to level 4 (1000w Kit). It does seem that I have a predeliction for expesive education, post event!! But if nothing is wrong, ya learn nothing much!! Research and then buy would be smarter than my doing it the wrong way about!!

 

[d8veh]

Many of us learnt the hard way too.