Firstly, what are your power needs while boondocking?
They call it a "generator" but it generates nothing. The battery already HAS power, it is just storing the power like any battery and no battery is a generator.
Solar panels can "generate" power, then feed it into the battery for storage.
The battery has a limit of how much power it can store, termed in amp hours.
You might have a 100 amp hour lead acid battery already on RV, and you can use half of that or less if you want to take care of your battery.
With li-ion batteries you can use nearly 100% of the amp hours (same as your phone battery where you can deplete it to zero, charge back and everything is fine).
So, a 100 amp hour li-ion battery can give you nearly 100 amp hours of power, all at 12 volts, and the lead acid maybe 45a/h - where also lead acid battery's voltage drops as the battery is depleted.
You will never run your air conditioner on either of these - you need a very big bank of batteries to run a/c and that is crazy. People who full-time do it, but it makes more sense for those who have skills and needs. Run the gas generator for the a/c.
Most everything else can run off a couple of lead acid batteries or the bigger Jackereey type systems.
Boonocking requires you learn how to live off of DC power. Forget the inverter for all your household appliances. It is needed to charge your laptop, but do everything else off of the DC that you can. Cooking off of propane, and 200-330 watts of solar or more.
There is endless ways to go about it, and endless needs, everyone is different and every need can be met slightly differently and with different configurations. We cannot guess on yours.