The Smart Battery Isolator (SBI) is a device that will sit inline between a vehicle's start battery and its auxiliary battery in order to provide smarter control logic for charging and loads. There are three inputs and three outputs for the starter battery, auxiliary battery, MPPT charger, fridge, freezer and lights.

The unit is efficient, going to sleep in-between polling cycles and utilising components with low current leakage. All connectors are XT-60 in either the relevant male or female variants. The system is powered from the auxiliary battery and runs at a nominal voltage of 12V (+/-4V).

There is a small OLED screen that is capable of displaying voltages and current info, as well as alerts and mode of operation. WiFi for debugging and bluetooth for phone app control.

There is a physical mode set button as well as a BOOT and RST button for programming of the ESP32 using MicroPython.