Welcome. I'm heavy 18650 and Batrium and would love to have a LifePo4 setup one of these daysHi,
I'm Keni, here is my 48v 100Ah so far.
I'm using a Batrium and 16 longmans... I will eventually plug this into a Victron, my solar and mains... May build another bigger system in the future, depending on how it gets on...
A shunt measures and reports on coulombs (ah) going to/from the battery. From this, you can determine charge and discharge amp-hours and SoC. It typically doesn't perform actions but provides data for something else to take action.