Help for a newbie

[Froggyribbit]

Hi im James , this is my first electric bike and i went for a lower end cheap ebay kit first to try see if i like them before going up market this is the item i brought .

1 Electric Bicycle Conversion Kit 250W 24V Cycle Bike Kit with Battery UK Seller | eBay

the problem is is not performing to my expetations . So first of all Dam its heavy i know its because of the SLA batteries . Seconds thing is it dont seem that powerful, i know its not a moped and i dont want it to be but on a flat with throttle alone it only takes me at 4 mph is this normal . Is there anyway of making it a bit fast like upping the voltage to 36v or changing the controller to a more powerful one?

The pedalec seems to work ok just the throttle if i take the wheel off the ground and use the throttle the wheel only spins at 9mph again is this normal .

any help would be great i would love a good ebike but if this is all they offer ill go back to my car

 

[Cyclezee]

Hi James. welcome to the Forum.

Sorry to hear that the conversion kit is not performing to your expectations.

If it is a lighter, powerfull and reliable kit you want then I would suggest that you consider an eZee conversion kit. You can more details on our website here Cyclezee Ltd - Home

Regards,

 

[flecc]

No, they are much better than this, yours is definitely faulty since it should run you to around 15 mph. Since they are over two years old your batteries may have been dud at point of delivery since they should be regularly charged to maintain their condition. If you are able to connect a meter across the battery supply, you be able to see if the 24 volts crashes the moment you operate the throttle, which will indicate dud batteries. If that's not the problem, either the motor or controller are faulty.

 

[JuicyBike]

Hi James
Do you have two grey wires coming out of the controller, joined together?

 

[banbury frank]

Hi Definitely Battery old stock Link below for good battery's

PAIR of RITAR 12V 12AH Batteries for ELECTRIC BIKES | eBay

Frank

 

[Froggyribbit]

Hi James
Do you have two grey wires coming out of the controller, joined together?

No i dont there is a looped blue wire which i belive is the limiter but ive unplugged this and it makes no diffrence.

 

[Froggyribbit]

No, they are much better than this, yours is definitely faulty since it should run you to around 15 mph. Since they are over two years old your batteries may have been dud at point of delivery since they should be regularly charged to maintain their condition. If you are able to connect a meter across the battery supply, you be able to see if the 24 volts crashes the moment you operate the throttle, which will indicate dud batteries. If that's not the problem, either the motor or controller are faulty.

arrrr ok ill have to get e new mutimeter since i blew my last one and have a look thanks . I didnt think that even a 250 w motor would only take me 4 mph and im not a fat git either only about 76 kg lol

 

[Froggyribbit]

What voltage would you consider a crash, its going to drop a bit but what range is acceptable

 

[Froggyribbit]

Sorry about all the questions and thanks again but now i know there not ( crap ) im really looking forward to getting on for a wizz about . If i was to buy new batteries im not really looking for that much range to be honest about 5 miles throttle or 10 assisted what size batteries should i go for ?


Again thanks you

 

[flecc]

If the batteries are dud, the voltage will crash very low under load. Freshly charged it should maintain at least 22 volts. I can't be accurate about the range without knowing more about the motor, the battery capacity and the terrain, but with a 24 volt SLA setup I'd expect at least 10 miles if the batteries were sound.

N.B. Crossed with your last post. Two 12 volt 7 Ah should be enough for 10 miles assisted, 12 Ah ones would extend the range but be much heavier.

Ask as many questions as you like, it's what the forum is for.
.

 

[Froggyribbit]

2X 12V 7AH / 7.2AH FRESH STOCK 12 VOLT 7.2AH RECHARGEABLE BATTERY MOBILITY | eBay


Something like this?

 

[flecc]

Yes that's it, if your present batteries are dud these would do the trick. Do make sure your existing ones are dud first though.

 

[Froggyribbit]

Just took it out charged it up and notice when I put the throttle on the lights on the battery meter go from full to half so I think your right thanks for the help

 

[Froggyribbit]

Just got my new multimeter on a full charge the batteries read 24.5 ( which I thinks a bit low ) then when any loads put on it drops to 22. 3/4 so I think there dud

 

[flecc]

Nearly 23 volts under load isn't bad, so I don't think it's the batteries since with that voltage it should easily run you up to the 15 mph region on the flat.

There's something else wrong if it only goes to 4 mph on that load voltage. Either Hall sensor, sensor lead(s) or phase power lead(s) open circuit is possible.

Since you've only just bought it and it's a UK seller, best to return it as faulty.

 

[Froggyribbit]

Nearly 23 volts under load isn't bad, so I don't think it's the batteries since with that voltage it should easily run you up to the 15 mph region on the flat.

There's something else wrong if it only goes to 4 mph on that load voltage. Either Hall sensor, sensor lead(s) or phase power lead(s) open circuit is possible.

Since you've only just bought it and it's a UK seller, best to return it as faulty.

I have sent it back now the seller seems to be nice and genuine and has said I can return it , I can justify spending slot of money on a bike until I've had a good test of one , has any one had experiences with the kits from china are they worth the 200 pound ?

 

[GT3]

I bought my first kit from a Chinese Ebay seller before I became aware of this and other forums. I bought the kit without batteries and sourced SLAs locally. Arrived in good time and all worked. I had a couple of early component failures (throttle) but overall was happy with the deal.

You have to go in with your eyes open, appreciating you have very little comeback once it is received, that you should have to pay VAT and duty and you are unlikely to receive useful instructions. I relied upon usual Ebay rules, good feedback for the product you are buying is critical.

 

[JuicyBike]

Just as with any gamble, if you can afford to loose the money, then you are able to claim the winnings...