Hardware Requirements
Each Lantern Power Monitor hub is capable of monitoring 15 breakers. If you're buying kits or pre-built hubs, that's really all you need to know, divide the number of breakers by 15 and that's how many kits/hubs to buy.
If you're building your own hubs and acquiring your own parts, there is an option in the mobile app to generate a bill of materials with a complete list of every single component you'll need. At a high level, for each hub you need:
- Raspberry Pi
- Lantern Power Monitor PCB
- Case (Optional)
- Voltage Transformer
- Current Transformers
Raspberry Pi
![](3A.jpg)
The power monitor was designed for a 3A+ but also works with a Zero 2 W, 3B+, or 4B (any amount of memory is fine).
Lantern Power Monitor PCB
![](gerber.png)
![](pcb.jpg)
![](assembled_pcb.jpg)
Pre-assembled PCBs can be purchased via our webstore.
Case
![](case.jpg)
Cases with and without a flange for surface mounting with screws exist for the 3A+, 3B+, 4B, and Zero 2 W. STL files are available here that can be used to 3D print your own case.
Voltage Transformer
![](vt.jpg)
A 12V AC/AC voltage transformer is required to monitor the voltage of your mains so a power factor can be calculated resulting in a very accurate power reading. The Jameco Reliapro 10428 has proven ideal, but a variety of transformers could be used and calibrated for.
Current Transformers
![](cts.jpg)
The Lantern Power Monitor PCB does not have burden resistors built in and therefore is only compatible with current transformers that do contain a burden resistor. Specifically, it works with all YHDC SCT013 CTs that output 0-1V. The approved model numbers are:
- SCT013-005
- SCT013-010
- SCT013-015
- SCT013-020
- SCT013-025
- SCT013-030
- SCT013-050
- SCT013-060
- SCT013-100