Customizing a Rockrider E-ST 520

[Monho]

Hello,

So clearly there's very few people knowing this bike model sold by Decathlon mostly in europe.

But maybe there's somebody here that knows it and may be able to give me a tip...

Its a MTB model that doesn't come with any extra electric connection like lights or usb charger.

But you can buy and plug two cables to the motor is order to install front and rear lights, wich I did.

But I really miss the option of powering extra stuff I use, first the security camera, the horn and last the turn lights.

There's not too much technical info, for the lights they say they must be compatible with a brose T aluminum motor and be 6w front and 0,6w rear. So I don't know if these cables and output can handle extra stuff attached to them....

I found the detail sheet I used to install the lights but it seems the motor doesn't have any extra output:

https://cdn.decathlon-share.com/product-user-guide/620280523742b/monter-son-eclairage-e-st-520-900.pdf

If somebody can help...

Thanks in advance!

 

[amberwolf]

If you are willing to put a Y-connection into the cables from the battery to the controller, you can get a DC-DC converter that takes the battery voltage and converts it down to the voltage you need for your accessories. Just make sure to get one that can supply enough current (Amps or milliAmps, A or mA) to run everything at once. If they are all "12v" items, then that is typically really 13.6v "automotive 12v", and there are a lot of options for that, from various battery voltages.

If the battery doesn't have a switch to turn it completely off, then I recommend installing a switch on the Y-connection to turn the DC-DC on / off, so it doesnt drain your battery when you're not using the bike.

To make the Y-connection, you may be able to buy one, depending on the connectors used on your system, or make one from two extension cables for the connectors on your battery/controller.

 

[E-HP]

But I really miss the option of powering extra stuff I use, first the security camera, the horn and last the turn lights.

There's not too much technical info, for the lights they say they must be compatible with a brose T aluminum motor and be 6w front and 0,6w rear. So I don't know if these cables and output can handle extra stuff attached to them....

I found the detail sheet I used to install the lights but it seems the motor doesn't have any extra output:

If you're going to tap into the existing system, then I'd first research how much a new Brose controller will cost if you screw it up, especially if you are intentionally going to exceed the rated output.

The separate buck converter route suggested by Amberwolf creates the least risk by keeping the lighting independent of the motor electronics.

https://www.amazon.com/SUPERNIGHT-Converter-Electronic-Transformer-Waterproof/dp/B07H23J6WG/ref=sr_1_10?keywords=36%2Bvolt%2Bto%2B12%2Bvolt%2Bconverter&qid=1673911604&sr=8-10&th=1

 

[Monho]

Hello,

Deep good answers, thanks very much!
Am afraid I may lack of knowledge, there's some notions that I must catch up...

When speaking of controller are you referring to the screen device that turns on/off the bike? Am afraid not, but have to ask... Since I can't see where else put an Y to get another output...

 

[Elinx]

....
When speaking of controller are you referring to the screen device that turns on/off the bike? ....

No, it is about the internal controller board.
If you burned this board and you can't replace or replair it, the motor won't run anymore.



Amberwolf proposed to connect your devices directly to the battery, without the need of the controller.
Because this is 36V you need to power down this 36V to the Voltage you need for your usb charger, security camera, the horn and the turn lights.
This is possible with a DC-DC step down converter between the battery and these devices.
E-HP has linked to a 36V>12V 10A (120W) converter, which should be enough, but if you want another Voltage or less power you can choose another one.