In addition, think about where you want to put the unit. My Monitor panel is in the bedroom and my first idea was to put it there. Turns out it was much easier to put it right by the entrance, above where the disconnect switch is located. In retrospect, that is a much better place since I can see it from the cockpit and it does indicate things that you want to see in real time, like, engine is running...is the alternator charging the house and how far to I have to go to get back to 100%?
Trust me, you will become a SOC miser, always wanting to see that 100% number again!!!!