PwrTool 500
500A Smart Shunt for Home Assistant
We've recently started using this ESPHome component and thank the author for the work they've done.
24.04.10 - We've been accepted to do a crowdfunding campaign with Crowd Supply. More details coming soon - expect updated docs as we lock in final details.
Overview
A 500 amp smart shunt for DC power systems up to 60v. It is based on our FLIP-C3 mainboard and power center running ESPHome for seamless integration with Home Assistant out of the box.
An on board 45w NPN MOSFET can power fans, LED strips, or control external relays based on automations in Home Assistant. Also keep an eye on the ambient temp/humidity of your control box with the onboard sensor and catch potential issues with the on-die temp sensor of the analog-to-digital converter IC.
PwrTool 500 is fully open, this is your hardware and it is fully hackable. Extend it further with ESPHome, Tasmota or your own custom Arduino or ESP-IDF code. The on-board buck converter provides a total power budget of 10w for all of the activities. Make the PwrTool the brains of your power cabinet.
Features
Hot or Cold Side use
Selectable by twisting jumper position
Polarity and TVS protection
6-60VDC - Compatible with any lithium or lead-acid system
Bi-directional current sensing up to 500A(300A contstant)
INA238 16-bit ADC with on-die temp facing shunt
SHTC3 Temperature & Humidity Sensor for environmental monitoring
RGB LED & Red Status LED
CTRL-Connection for external control via NPN MOSFET
Specifications
FLIP_C3 Mainboard
BLE 5.0 & Wifi b/g/n
5v2A (10w) buck converter
ESP32-C3
Internal temp sensor
GPIO Components
Red "Status" LED - GPIO 10
WS2812 NeoPixel - GPIO 8
Level-shifted output on header as L8
User/Boot Switch - GPIO 9
Reset Switch - EN Pin
i2C Bus
SCL - GPIO 1
SDA - GPIO 0
Addresses
INA238 - 0x40
changeable with on-board DIP switch
SHTC3 - 0x70
Open Hardware
The PwrTool 500 is open source and files are provided under CC4.0-BY-SA
EasyEDA Pro
Schematic, Board, & BOM are originally created in EasyEDA pro. Also see FLIP_C3 files.
3D Models
coming soon - made in Onshape
Open Software
ESPHome
We are building out a modular set of configuration files for our FLIP_C3 platform and the products it powers. They are currently available on github here:
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