I'm about to purchase a SmartShunt -- love the concept!. I see in this forum there are some folks experiencing Bluetooth connectivity issues. As with any radio, it can be interfered with by EMI and metal structure obstruction. I plan to use the SmartShunt in my 5th wheel. The front compartment has the batteries, charge controllers, etc. and all electrical wiring. I suspect quite a bit of EMI in this compartment. Since all current goes through the negative side of the shunt, near-to-battery placement makes sense to reduce current loss... in other words, the Bluetooth transmitter is located next to the worst EMI.
Where is the best placement for the SmartShunt?