I got my digital meters from EBAY/CHINA.
Mine are mounted in a LOWES PVC Three Gang specialty switch box..
All wiring goes to the battery switch location using PVC flexible conduit.
Doing alot of camping off the power grid we wanted to be able to monitor the static 12VDC feeding the trailer as well as how many DC AMPS the battery banks were producing. It is neat to watch the smart mode charging voltages changing their charge levels when you are in charge mode.
My meter panel looks like this
Mine is great and by watching the meter panel I know how long we can go without doing harm to our battery back. There are a few commercial battery monitors out there Bogart TRIMETRIC TM-2025-RV being a popular one. This comes with alarms that my homemade panels don't have...
Roy Ken