Hi Diane;
Well, it sounds like one thing or another is currently malfunctioning.
Your brand-new inverter would be my first guess.
larger/more batteries are always nice but they are not your problem.
If your whole system was up and working correctly, changing inverters
should have been as easy as you thought.
I would check each circuit one at a time to see if there is a fault.
If each breaker can come on and all things on that circuit work then I would hook your old inverter back up and see if everything works correctly.
If so, I would call the tech help at Renogy and see what they think.