Welcome to irv2.
Look at
the end of this link will explain your solar panel and its function to keep your chassis battery charged also other info for reference only.
Here is a link for your battery system.
You may or may not have the
BIRD SYSTEM for charging all your batteries both house & chassis.
Here is a
Owners Guide &
Brochure for you.
In my signature below you will see three links that will give you more info on your coach.
Congratulations on your Newmar many safe miles for you.