I have solar panels which were connected to my previous modem but the modem that I have with Comcast (just installed 3/5/2018) only has 2 ethernet ports which are full. What is the remedy for acquiring a modem with more than 2 ethernet ports?
What is the exact make and model number of the "modem" that you now have ?
You'll want to add a network switch to your Comcast gateway device to get more ethernet ports.
Once again I prefer to not assume.....