Had my IoTaWatt for a few days now and starting to get to grips with it. However I am trying to setup an Output formula which does not work. My house is off-grid and has a solar array. The main house feed from the inverter shows a negative value when the power is coming from the batteries and positive figure when the PV is supplying extra power that is going to the batteries. I need/would like this to be the other way around.
I tried a very simply output formula (Main) x -1 to reverse the signage but this just returns zero (so me thinks a bug), changing it to x 10 or something does work. Basically multiplying by a negative number false.