Battery voltage and current draw monitor

For this project the goal was to keep track of backup batteries during float and active states. This helps to ensure the trickle (solar) charger is still functioning, and when in a power outage, how much current is being drawn from the system and how much capacity is left.  The system can be shut down remotely if is appears the batteries are out. An email alert is also sent when voltage goes below 11 volts.

 

parts:

• voltage divider; 10,000 / 2500 resistors will get us down from 15 to 3 volts - https://www.digikey.ca/en/resources/conversion-calculators/conversion-calculator-voltage-divider
• SCT-013 current sensor - https://www.aliexpress.com/item/32708887594.html?spm=a2g0o.order_list.order_list_main.91.a04c18025FSeB6

https://www.allaboutcircuits.com/tools/voltage-divider-calculator/

• simple display to show current and voltage
• current sensor
• esp32