Your RV systems are 12v
Your two 12v batteries are wired "PARALLEL" , positive to positive, neg to neg,
Series is inline together to make 24v
You could have ten batteries in parallel, it is still 12v
Any solar will be for charging 12v
You cannot attach 24v or 36v to a 12v battery
Solar panels come in many sizes and voltages
It's the job of the solar Controller, to create the proper voltage 13~14 to charge the 12v battery bank
Either of your inverters is big enough to power the tv and minor device chargers
But if your want to run the toaster, microwave you will be better off with a portable generator, which can also be used to power the converter and charge batteries, when the sun and weather won't comply to your needs