72-year old newbie to solar

I've found that the best way to wrap your head around all this is to think of it in terms of...water.

Your solar panels are the water pipe coming into the house.  The charge controller is the valve that controls the flow of water.  Your batteries are the buckets that hold the water.  And your devices (Nutri-Bullet, lights, fans, cell phone, tablet, and computer) take water from the bucket.

We really can't tell you "how big your bucket should be" (AKA how many batteries and what size) because there are too many variables to consider that we don't know about.  For example: How much water are you getting per day from your pipe (AKA How much sun are you getting at your location typically)? How big is your current bucket (AKA What's the storage capacity of your battery)? How much and how quickly do you drain water from that bucket (AKA What are the current demands of all your devices combined)?

But the "formula" is simple: You must have sufficient power coming in to completely fill the storage capacity of your battery faster than your devices can drain it.

We would recommend our easy to use Renogy Smart System Sizer:

www.renogy.com/smart-system-sizer/

Simply drag and drop your desired electronics into the middle page and if you can't find your electronic, search for it. Give an estimate for how much time (in hours) a day you plan on using each electronic and it will give you a recommended system size. On the right hand side you can modify the watts of each appliance if you know it, otherwise a general value is given. In regards to the inverter, 5000W will work, but it seems rather large for your application.

-Renogy Team