I like to build my own projects whenever I can...
My battery bank has two zones and I made up this three meter panel to monitor the battery banks using a three-gang panel electrical specialty switch box and cover from LOWES.... I glued the meter panels behind the specialty switch panel openings. All cabling to/fm the battery switch connection are protected with 3/4 PVC flexible PVC tubing. Each leg is protected using a 1 AMP 12VDC fuse.
I use a 12VDC METER (ebay Sure Electronics) to monitor each BATTERY zone (Two meters)..
I use a +/- 0-70 DC AMP meter (ebay Sure Electronics - no longer avail) to monitor the selected battery bank. This current meter monitors how much power is be demanded from the battery bank when being charged and also shows how much current is being pulled from the selected battery banks when being used camping off the power grid.
The smart monitors like the Trimetric TM-2025-RV has an alarm feature built-in which is a nice thing I wish I had but cost more.
I use my meter panel when camping off the power grid to give me an idea when my batteries are approaching their 50% charge state. Most helpful...
Roy Ken