I use a Bogart TM-2025-RV
to monitor my solar panel and battery state of charge. At a glance I can tell the state of charge of my batteries. It also displays my Engine battery voltage.
I had Phoenix mount it along with the inverter & tank monitor on the side of the cabinet by the left side of the door.
I had them mount my Charge Controller and Progressive EMS Display
on the right side of the door. This way when I connect my power I can glance in the door to see what the voltage is or any error signal. I spend my winter in RV parks that have frequent voltage problems so the system saves me ruining my microwave or refrigerator controls.