Which Victron SmartShunt should I get for my van battery?

Q&A and troubleshooting
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1

I have a 80Ah AGM 800CCA battery that I want to monitor, I’ve noticed that the SmartShunt comes with different options like 300 A / 500 A / 1000 A / 2000 A. Which one should I get to accurately monitor this battery?

2

You could almost answer that yourself :
What is the maximum current the battery can deliver according to the data sheet?

PS: It´s only a 80Ah AGM …

3

What is the max current you are going to use. Normally a shunt is not used for monitoring starting current. An 80Ah battery should be OK with a 300A shunt.