I am getting ready to install the Vectron Battery monitor and I am debating on whether to have it it inside the cabin or in the galley.
Considerations, I have a Morningstar M1 meter in the galley which tells me battery voltage and voltage from the solar panel going into and coming out of the Morningstar controller. The Vectron monitors all of the current going into and out of the battery with a shunt and will tell you among other things the percent of charge left in the battery, accurately. Monitoring consumption by the refrigerator and whatever else.
Advantages of having it inside, being able to tell when it is time to turn off the TV... disadvantages having to look inside, crawl inside to check functions...