My dad made us 2 bat boxes a few years back and we were having a problem finding the best location for them.  This summer while working in his shop, Barry had a bat flying around and he realized they were living in the rafters.  This is on the south facing wall above the bay door.  It gets full sun all day and they have plenty of room to get in.  I was surprised they were living there, the “rules” say they want to be near water.  The small creeks down there tend to dry up each summer.  We will see if they find it and move in, hope so!