The Raspberry Pi is an amazing device that can be everything from a server to a game machine, but have you ever wanted to have a self-contained, portable unit? Or maybe a server NUC with a built-in uninterruptible Power Supply?
On this episode of Know How, Patrick and Padre take you through the steps of creating a "LiPi" which can give you up to 12 hours of power for your RasPi while also acting as an auto-switching UPS that can run on 6-26 volts!
We've done several RasPi projects this year that could bennefit from an independent power source. (The TorPi, the Pi-Hole, The RetroPi) -- We want to create a power system that can act BOTH as a power system AND an uninterruptible power system.
- Must have a way to power the RasPi WITHOUT using the USB connector
- Must have a way to switch from line power to battery power AND BACK without disrupting operation.
- Must have a way to turn OFF power completely (to prevent draining the battery pack)
- Must operate or more than 3 hours
- NUC sized
- Should have a way to gracefully power-down the Pi
- Must have a way to swap the SD card without dissasembly
- Raspberry Pi 3 ~$35
- 5V UBEC (Hobbywing - Accepts 5.5 - 26V) ~$3
- 3 x 18650 LiPo Cells (3800mAh) ~$8
- 5.5MM x 2.1mm DC Power Jack ~$1
- Rocker Switch ~$12
- Momentary Switch ~$5.59
- Lithium Ion Battery Charger w/Protection ~$1
- JST Connectors ~$0.60
- Walkera Connectors (x 3) ~$0.40
- ~5 Watt/Hours
- Each Cell can provide (3800 x 3.7 = ) ~14 Watt/Hours
- We have ~42 Watt/Hours of capacity
- But we don't run down all the way... 30% is when the protection circuit will kick in.
- So we should count on 29 Watt hours of USABLE power
- 29 / 5 = Just under 6 hours AT FULL POWER
- Shutting down WiFi/Bluetooth and not pegging 100% power should give us close to 8 hours.
The 3D design can be found at the following link:
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