I am designing my system for RV. I have 2-100W panels and I will be getting an MPPT controller, so I can add Li batteries later. I also want to put in a battery monitor. The monitor that I am looking at is a 500 amp Renogy Battery Monitor. It has a screen that tells me power going in and power going out and total charge and other stuff. Questions is....since it tells me all this information, it seems that it is telling me also what my solar panels would be putting in, or shore power. If that is correct, then I would not need a Charge Controller that had any type of readout, or am I wrong. Thanks.