I delved a bit deeper and I can see the total PV only updated in realtime and not the individual devices in a system with e.g. 2 x 250/100 or similar. In a system with one it works realtime as well as for 450/xxx where all trackers are transmitted in realtime. If I need to see the individual mppts in realtime I can use rconsole, but suspect with large systems and multiple mppts things will simply get far to busy.