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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