I have two SS CC and a SBS BT networked together. Each of the controllers shows they are connected to the SBS and receiving Temp and Voltage. (green check boxes in Settings) When I look at them in Victron Connect I see the Temps are the same but the voltages are different. I assumed that was because I had to connect then disconnect to each, one at a time. So I brought up the VC app on three devices at the same time to compare. The voltages were different on all three at the same time. Not by much. 12.3, 12.21 and 12.41 . All the devices are within 2 meters of each other. Why would they be different?