Tapping power off E-bike battery

[Rider-Jack]

Hi all,
I’m looking to try and take power from my Bosch e bike battery to power a tracker and some lights on my e-bike. I want to have power even when the bike is off so that tracker will last as long as possible if it’s stolen.

The bike has a Bosch performance CX 85nm Motor with 750wh battery.

It has a 12v output on the motor however it seems to be switched off

Has anyone done this before?

 

[Anders]

I haven't done what you are trying to do, but I have connected my front light to the Bosch battery through the 12V "light" connector on the motor. That is quite stright-forward when using an Bosch cable with the correct connector. However, all 12V connectors has to be enabled by your LBS. In any case, I believe all of them will be turned off when the bike is turned off.

For a tracker, I use bikefinder. It has its own battery, I have to charge it every one to two weeks.

I have seen ads on line for a Bosch wiring harness giving you access to the 36V battery voltage, but I don't really know if the power is available when the bike is turned off. You could of course tap into the OEM harness, but I guess you'd need some electronics knowledge to regulate the 36V down to whatever voltage the tracker needs.

 

[Rider-Jack]

I haven't done what you are trying to do, but I have connected my front light to the Bosch battery through the 12V "light" connector on the motor. That is quite stright-forward when using an Bosch cable with the correct connector. However, all 12V connectors has to be enabled by your LBS. In any case, I believe all of them will be turned off when the bike is turned off.

For a tracker, I use bikefinder. It has its own battery, I have to charge it every one to two weeks.

I have seen ads on line for a Bosch wiring harness giving you access to the 36V battery voltage, but I don't really know if the power is available when the bike is turned off. You could of course tap into the OEM harness, but I guess you'd need some electronics knowledge to regulate the 36V down to whatever voltage the tracker needs.

Thanks I think I’ll try and tap it off the main battery and use a regulator to step it down.

 

[Darren66]

Hi all,
I’m looking to try and take power from my Bosch e bike battery to power a tracker and some lights on my e-bike. I want to have power even when the bike is off so that tracker will last as long as possible if it’s stolen.

The bike has a Bosch performance CX 85nm Motor with 750wh battery.

It has a 12v output on the motor however it seems to be switched off

Has anyone done this before?

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[TommyC]

I fitted a powunity biketrax to my bike. It has its own 1000mah backup battery that lasts 3 weeks on its own and you can get a twin battery harness for it. I just replaced the battery with a 5000mah and it lasts around 2 months. You will need some soldering skills to do this though.

It’s charged off the motor high power port which needs to be activated.

 

[Mikerb]

I think you will get an error on a Bosch Smart system if you try connecting direct to the battery. The controller needs to be a ble to recognise every device on the CAN.
I use a "Tractive" GPS tracker ( designed for dogs!). It has its own battery which lasts a couple of weeks and its app sends you a warning when it goes down to 30%. If the bike is stored within range of your wifi the tracker goes into battery saving mode so little or no battery use when not riding.