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
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.