I have a Smart Solar 250/60 connected to a Multiplus 800/24/16 and a 24V LiFePo battery using a bus bar.
While charging there is a ~0.3V difference between the voltage reported by the Smart Solar and the voltage reported by the Multiplus. As an example, at the moment the SmartSolar is reading 27.16V and the Multiplus is reading 26.86V.
I know there will be a slight voltage difference, I'm just not sure if 0.3V is expected or if it points to wiring losses. The system is remote (set up for my parents) so don't want to trouble Dad with redoing the wiring if there's not an obvious problem.
Edit: Forgot to mention, the Multiplus is in an ESS system and the load is fluctuating between 100 and 300W while it's charging.