TL;DR

BatMon has been designed to work with various types of current shunt:

• Onboard PCB shunt designed to cope electrically and thermally with up to continuous 30A loads (suitable for most appliances in a 12/24v off grid system)

• External Shunts designed to cope electrically and thermally with up to continuous 500A loads (suitable for high power appliances in a 12/24v off grid system e.g. power inverters)

Geeky Details if you’re that way inclined…

We chose to measure current via a current shunt. This is because we measure current flow four times a second all the time. Hall-effect sensor measurements tend to drift over time which makes them useless for our application.

We measure the voltage drop over the current shunt using purpose-built battery monitoring silicon. Op-amps and Analogue to Digital Convertors (ADC) get a sample reading every four times a second.

Bearing in mind Ohms law, a more accurate measurement will be obtained by using the lowest rated shunt possible – therefore, we recommend (and provide the capability to do so) to fit the smallest current shunts that your system needs.

Through years of research and working with users we designed our PCB to be modular to accommodate onboard or external current shunts. Simple - yet unique in this industry.