Recommendation for adding solar
I have a 2018 3120rl that we bought new back in 2018. I still have the two original factory batteries and am ready to upgrade. I am very interested in upgrading the batteries and installing a solar system. We typically boondock for only a couple days at a time, but want the freedom to boondock longer and not have to operate on portable lights and heavy blankets! I don't want to go crazy, but we are looking to be able to enjoy the RV while boondocking. We don't need to run the microwave, coffee maker or hairdryer, but would like the ability to turn on the lights and perhaps use the AC and TV on a limited basis. Our fridge is a dual mode fridge (propane/electric). I plan to install softstart this spring as well.
I'm looking for advice on how best to approach this and a rough idea of how much I can expect to spend on this upgrade. Generally, I am pretty handy after working 30+ years as an engineer in the aerospace industry, but I am not an electrical expert by any means.
Also, I have a portable 4500W generator that I can use as a backup, but really want a system that will allow me to boondock for several days without having to worry about running out of power.
Thanks in advance for the insights and advice,