LifePO4 12v, 20 ah gauge via I2C or similar

Components & Accessories Power
1

Hi,

Using an LifePO4 12v, 20 ah and a SparkFun Buck-Boost Converter I am powering an arduino with a Lorawan connected sensor in a rural hard to reach area.

My question is: How can I measure the battery status and capacity so I can be able to read it from home? sending the status and measurement through Lorawan is not an issue.

Earlier I used a Li-Po battery with a baby sitter and using the battery gauge chip on the babysitter and I2C I would be able to check the status of the battery but no longer as now I am using a bigger LifePO4 12v, 20 ah battery.

2

You might be able to use one of these https://www.sparkfun.com/products/12052 to test how much power it draws from a full battery to empty, then implement that into your design (count the power drawn, and use the Arduino to sample the amount and send it back over LoRaWAN

3

Hi,

Great idea. However, the circuit from sparkfun is max 8 v while the battery I am using is 12 v.

4

Use a buck boost converter / step down converter