Battery Motor interface

[JVB]

Hi, I've been pointed here from the CTC forum website.
I'd appreciate some advice from members who understand the workings of an electric bike. I have added 3 kits to various bikes I own - 2 are rear hub motors with big downtube batteries supplied by the excellent Woosh; the other is the Cytronex C1 kit fitted to a lightweight bike and is also excellent for its intended purpose, which is a bit of help now and again. I have thought about using the rear wheel off one of the MTBs with a smaller (lighter) battery but don't really understand the details of how the motor and battery are connected. I know that there is some sort of controller which "sorts" the voltage/wattage/amperage but what exactly does it do and, given the motor wheel's configuration, what should I be looking for in a battery and controller. I'm asking this because the bikes I would play around with are in Europe and, post-Brexit, I think I would have to source the components from outside the UK. The motor wheel has an Aikema 85 hub, which I like a lot but which Woosh no longer supply. It is 36v, rated at 250w and has the controller built into the battery holder (looking at the Aikema website I'm guessing that it is the KZQW22-HL1 model) but the only item I can understand is that it has a 16A "limit current", already far outside my knowledge.
If I wanted to use the wheel what should I look for in a battery, controller and display? I'll be grateful for any help.
Thanks
JVB

 

[saneagle]

All motors and batteries work the same. If you want to replace any of the batteries with a smaller one, you can choose any you want that has the same voltage, and you can fit it wherever and however you want. There are just two wires that connect the battery to the controller that are black and red. You just have to join red to red and black to black. Most people can manage that; however, you might need to solder on new connectors or solder the wires together if you can't find a battery with the same connector.

Most of the Woosh kits have the controller in the battery receiver/base thing, which makes things a bit more complicated. rather than replace everything, you can leave that in place so that you always have the option of using the bigger battery. All you need then is the connector that fits that base, which you can solder to the wires on your new battery and plug it in to the receiver as long as you make sure you get the wires the right way round. There are two types of connector. This is the one shown in the Woosh photos, but check that it's the one you have:

Hailong Ebike Battery Power Discharge Connector Plug 4pins Male & Female | eBay

1 Hailong1/2 4pins Male Female connecto Ebike Battery Power Plug. Ebike Battery Power plug. Feture: 4pins Male Female connector. Color: Black. Specification：.

www.ebay.co.uk

The last consideration is how much current your new battery can provide. Regardless of the size of the battery, it needs to provide a minimum of 20 amps, so check the specification.

If you want to fit a small bottle battery and you want it to look neat, you'll have to chuck everything from the Woosh kit except the motor. Some batteriers have the controller and other stuff included, otherwise, you'll need to buy a controller, LCD, pedal sensor, throttle, etc as a set and stick the controller in an under-seat tool bag or something like that. If you want the same power, you have to see what amps are written on the controller you have. You also have the option of upgrading everything to 48v, which gives more power and speed unless you already have 48v.

If you want more specific advice, you need to give more details of what you have.

 

[Woosh]

I have thought about using the rear wheel off one of the MTBs with a smaller (lighter) battery but don't really understand the details of how the motor and battery are connected.

You can replace the battery + controller (at the base of the battery) with a 36V 10AH bag battery and controller that goes inside a saddle bag like this:

The 36V 10AH is good for about 30-35 miles from a full charge.
If you want to proceed with this idea, please email support@wooshbikes.co.uk

 

[Woosh]

it needs to provide a minimum of 20 amps, so check the specification.

the maximum for the lightweight 85SX is 16A. We still use the 85SX in the Woosh Faro but stopped selling the motor in kits.

All you need then is the connector that fits that base, which you can solder to the wires on your new battery and plug it in to the receiver as long as you make sure you get the wires the right way round.

it's fairly straightforward to open the controller (4 screws) and make an extension lead beween the controller and the battery using Anderson or XT connectors.