New build Carrera Kracken conversion.

[Deleted member 4366]

Hi Steve, just looking at the motor and battery on your bike and was hoping to pick your brain, as I've just ordered a similar setup.

I was wondering how you secured the battery and if possible have any pics?
Is your motor 48 or 36v, same question to the battery?

Lastly have you tested it off road yet?

Many thanks and apologies for the thread hi-jack

If you look at post #3 in this thread on page 1, you'll see a picture.
Go down to your local sports shop to find football boot bags. The best ones have a double zip around the top.
You then cut a piece of 3 or 5mm plywood exactly the same size as the inside of the bag. We made a custom rack for this one out of aluminium tube from Wickes. You smash the ends flat, drill the holes and then file the ends to a nice shape to make the struts. You can use a ready-made rack, which will be a bit heavier, or use a seatpost mounting type if you have rear suspension. Next, you bolt everything together to get the plywood central, then unbolt it and put the plywood in the bag and bolt through the bag and the plywood to the rack. You should use coach bolts with thin flat heads so that they don't dig into the battery. Lay some insulation foam over the plywood just to make sure.
The bag will then be fixed securely ready for the battery.
There should be room for the controller in there too, which makes it very neat. You can make holes for the wires near the bottom with a soldering iron to melt the bag. Don't worry about waterproofing the wires because no water will go in. If there's spacer around the battery, pack it out with foam.
That's it: light neat and secure. You can either unzip to charge and connect or mount a charging socket in a panel on the side. I've never had anyone try and tamper with mine. Maybe someone has unzipped the bag, but all they see is a load of wires. They don't even know there's a battery underneath.

We often take our bikes along pot-holed cycle tracks, some of which are unsurfaced. I can't see any problem with off-road except if it were bumpy, I'd make sure there's sufficient packing over the battery to stop it jumping inside the bag.

The motor, battery and controller are all 36v.

 

[iain85]

Thanks for that. Sounds achievable to me. I have a few ideas of mounting it in the frame triangle depending on dimensions of the battery. I like the idea of keeping the c.o.g low for handling purposes, however if this doesn't fit I will most likely use your method.

I still haven't heard back from Bms rethe the reason for the 36v controller not working which is a bit worrying! You think I just just ask them to put the 36v motor in instead? Would hate for a 48v controller to arrive rendering the whole kit unusable.

Cheers ,

Happy new year to all!

 

[Old_Dave]

Would hate for a 48v controller to arrive rendering the whole kit unusable.

Don't worry to much, the reason for the 36v controller would seem to be to save modifying the 48v one.

The choice of the 48v motor is just a cunning plan to get the required speed when run on 36v (although I don't see the logic.. I'm sure that the gurus know what their doing, lol)