I'm not sure if you're fully set on how you plan to add solar but I just finishedy 350w solar panel project and I am very pleased with it. My thread is on here also and I pretty much just copied Titos work and recommendations. There's a few tweaks I'm going to do to breaker sizes but overall did it in a day and was very simple with the preexisting wiring etc.
Here is his video link
https://youtu.be/uJIEXhnF8MU
Here is his video link
https://youtu.be/uJIEXhnF8MU