This tutorial will help you to build your own Onewheel DIY portable charger. The DIY portable charger is capable of charging the Onewheel on the go.
In about 20min you are good to go for another session 🙂 With a large lipo you can charge the OW up multiple times.
Wanna see the charge in action. Watch our Onewheel movie on our Youtube channel.
This project deals with electrical current and lipo batteries which can be very dangerous. Please read the tutorial completely and proceed cautiously.
1. Requirements and tools you need
- Basic soldering skills
- soldering station
- wire cutter
2. Things you have to buy
2.1. Female XLR plug
You can easily find it everywhere on the internet 😉
2.2. 2-wire power cord
You have probably such a cable laying around, 3 feet / 1m.
2.3. Boost converter module (400 Watt)
- Aliexpress from China (US $ 6.33): link
- eBay (US) from China (US $5.75): link
- eBay (DE) from China (EUR 8,55): link
2.4. Case for the boost converter module
Module dimensions: 67x48x28mm/2.63×1.89×1.1 ”
- You can use any case you want. Please make sure the heat sinks aren’t covered.
- Free custom made 3D printable case on thingiverse: link
Any 6S lipo battery pack with at least 6000 mAh (approximately 130 Wh)
- Hobbyking (US): Multistar High Capacity 6S 8000mAh Multi-Rotor Lipo-Pack (US $77.18): link
- Hobbyking (DE): Multistar High Capacity 6S 8000mAh Multi-Rotor Lipo-Pack (EUR 65.93): link
- Coupling: when you buy one of the recommended battery packs you need a male XT90 jack. When you buy an other battery you may need another coupling.
2.6. Lipo alarm buzzer
2.7 6S lipo balance charger
You can use any 6s lipo balance charger you like. Here is a budget charger (charging takes a bit longer).
2.8. Optional: Voltage display module
- Aliexpress from China (US $0.94): link
- eBay (GER) from China (EUR 1,00): link
- eBay (US) from China (US $1.39): link
3. Onewheel DIY portable charger – How does it work?
- Take the power cord and cut it into two pieces (a short piece and a longer piece). Then strip all single wires at each end and make them nice with some solder.
- Take the XLR plug apart.
- Solder the minus wire (blue wire of the long piece) to pin 1. Use shrinking tube to isolate the pin.
- Solder the plus wire (brown wire of the long piece) to pin 2.
- Take a piece of wire and bridge pin 2 and pin 3 like on the picture.
- Before reassembling the plug make sure everything is soldered properly.
5. Wiring the boost converter module
Put the boost converter module into the case. When you use the 3D printed case the module will fit perfectly and it will stay in place.
- Take the XLR cable and strip the two wires at the other end. Now you can put it through the hole into the case. Make sure to connect the wire at the output terminal. Take also care of the correct polarity (plus: brown wire, red on the picture & minus: blue wire, black on the picture)
- Take the short piece of the power cord and connect the XT90 jack. Put the other end through hole into the case and screw the wo wires into the input terminal. For convenience we use the the same polarity (minus: blue wire, plus: brown wire)
- Optional: Voltage display: Take the red and the black wire of the display module and connect them to the input terminal. The white wire has to be connected to the plus pole of the output terminal.
6. Adjust the output voltage
- Connect the (fully charged) battery pack to the boost converter via the XT90 connector. The voltage display should power up as well.
- Take a multimeter and measure the voltage at the output terminal. Use a small screw driver and adjust the voltage to 58.2V by using the voltage trimmer.
- The voltage display should show roughly the same voltage. You can adjust the display by using the mini trimmer on the back of the display. It should show 58.2V afterwards.
- Messure the voltage directly at the XLR plug and check the polarity once again (minus: pin 1, plus : pin 2 & 3)
7. Adjust the charging current
Caution: The Onewheel DIY portable charger has no over discharge protection. That means we have to disconnect the battery manually when it’s voltage level become low (≈19.2V). Over discharge can be dangerous and it will damage the battery. For this reason it is advisable to use a lipo alarm buzzer. Please connect it to the balance connector of the battery every time you use the charger. After connecting it, it will beep and show the total voltage and the voltages of each cell. With the button please set the cell threshold voltage to 3.2V. If one of the 6 cells fall below 3.2V the lipo alarm starts beeping very loud. Now you must unplug the battery immediately and charge it with your lipo charger. Please note: the beeping is just a signal. The charging process is still continuing. Never leave the charging process unattended!
8. Onewheel DIY portable charger – Usage
Usage: Connect the lipo alarm buzzer with the 6S lipo battery pack. The voltage display should show ≈58V. Now plug the XLR into the Onewheel or Onewheelplus charging port.
Voltage display: When you start the charging process the voltage display shows the voltage level of the Onewheel battery. It will increase gradually to 58V which means that the OneWheel is fully charged and you are ready to ride the next session 😃
We hope you liked our tutorial.