![]() ![]() For my Electric Longboard, there is no easy way to fit a display so I went with a Step-Up module without one. If not? Install a fan or heatsink to improve heat dissipation. Make sure to get one with at least 50 % margin to your need. My Step-Up module for my Electric Longboard outputs about 3 amps (when the power adapter is maxed out) and it gets warm to the touch, even tough its rated at 10 amps. If you don't have adjustable current, you don't have a CCCV charger. The cheapest ones do not have it so make sure you get the correct one. There is a huge difference here!īe sure to get a Step-Up or Step-Down module with adjustable current. A typical 15 volt power adapter outputs 5 A, resulting in a power output of 75 W. This may fry your computer or other powering device!Ī typical output of a 5 volt power adapter is 1 A, resulting in a power output of 5 W. Just be careful here to not set your Step-Up module at a higher current than what can be delivered by the USB-port. The second option can have a input of 5 volts which is the voltage that all devices output from USB. The first option will probably charge your battery faster because it is easier to find a power adapter with more power output at a higher voltage than one at a lower voltage. For example: A 5 volt power adapter combined with a DC-DC CCCV Step-Up module.īoth options will charge your battery but they come with different benefits. One could use a lower voltage power supply. I would go for some voltage higher than 15 volts to make sure that the Step-Down module gets the difference in voltage between the input and output that it requires (read the specs of the Step-Down module).Ģ. You could use a power supply of a higher voltage and use a DC-DC CCCV Step-Down module. There are (among other alternatives) two different ways to charge this battery:ġ. The voltage at full charge is 12,6 volts. To charge in a moderate rate, the input current would be large, and things will get hot and heat is bad! If you have a high voltage battery (for say +30V) you really dont want a power supply of like 5 V. However, the Step-Up/Down module will need some difference between the output and the input to function properly. The voltage of the power adapter you choose should be near the voltage of your battery. For the Boombox, a DC-DC CCCV Step-Down module is used to lower the voltage from 19,5 V to 12,6 V (or whatever voltage I choose). For the longboard a DC-DC CCCV Step-Up module is used to boost the voltage from 19,5 V to 39,15 V (or whatever voltage i choose). This adapter is 19,5 V and are capable of delivering 7,2 amps. The Boombox has a 3s16p Lithium ION battery (18650), charging up to 4,2 * 3 = 12,6 V.īoth builds are using the same laptop power adapter. ![]() The Electric Longboard have a 9s1p LiHV Battery (high voltage lithium polymer), charging up to 4,3 * 9 = 39,15 V.ī. Get a female plug for your application for a nice clean build!Ī. Most power adapters comes with a male plug. The DC-DC converter will adjust so that the output voltage and current remains unchanged. For example, my wall power supply gives 19,5 V but I can also charge from my car at 12 V. Using this setup, it is possible to use different input voltages without changing the output. Never charge a battery faster than it is designed for. I should mention though, that all lithium cells benefit from slow charging and will last longer doing so. A more powerful step up/down converter (or better heat dissipation) may be required. Charging fast results in high currents which will result in more heat. If you want to be able to charge fast, buy a more potent power supply or use a bench power supply or a stationairy computer power supply. The rated power output is 120 W and it is maxed out during charging. In my setups, the power AC-DC Power adapter is the bottleneck when it comes to charging fast. Optional : Relay with signal input voltage close to your power adapter's output voltage. ![]() Battery Monitoring System (BMS) (One for 3s, one for 6s) 5. (The ones I'm using: Step-Up, Step-Down) 4. Step-Up or Step-Down DC-DC converter with adjustable current. ![]() AC-DC Power adapter ( Here is a great one) 2. ![]()
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