Wow, sorry to horrify you. There's lots of concern and caution on the internet and forums around parallel connections. I've got plenty of time to come up with something. Thanks for the feedback snoobler.
Haven't set anything up yet. Amazon has most of the gear out for delivery today (3 100w renogy panels) and the controller (Rich Solar 40amp MPPT). I purchased two Duracell GC2 6v golf cart batteries that will be running in series for 12v.
Question 1: How concerned should I be about off...