Thanks for all the comments and ideas.
Yes, I actually have 2 voltmeters. No. I haven't put my tongue on the battery terminals..yet. Ha.
Looks like wifi isn't the way to go.
My solar cell is 100 watts into a 100ah battery, power a few 12 volt LEDs. More than anything, I was looking at this project more as a learning g tool than anything. Great ideas and thoughts.
Thanks!
Doug