Trimetric 2030A DC Amp Hour Battery Meter System Monitor
This is a great system monitor. I don't think a day goes by that i don't refer to it to at least three times a day. It shows me instantly how much power i'm using at night ( i used to have to multiply the amps shown by the battery voltage to get the watts but it comes automatically now) I know that at night before i go to bed the amp draw from my battery bank should be around 5 or 5 x 24= 100w anything higher and i know someone forgot to switch lights off in the house.