I added a 2A inline fuse between the battery and "VIN".
As another forum discovered that "VIN" lead should be the final connection.
Guilty as charged - the bolts on the main connections can short onto the PCB if you connect the VIN first. Had to do some PCB repairs to get mine working again!
I think Neville meant the other earth - the one to the terminal block on the shunt. The shunt box only needs VIN. It gets the return path from the shunt itself.
Run your earth off the van-side connection on the shunt (ie, not the terminal that connects to the battery). As previously mentioned this means all gear that doesn’t have a direct negative connection to the shunt will still get counted.
2017 Swift Kudos 630FB (aka Swift Sprite Quattro FB) | 800W Solar | 200Ah LiFePO4
2012 Hyundai Santa Fe 2.2 CRDi Elite