if you want a genny get one, personally for years i caravanned with my daughters without genny or solar on c&mc and c&cc meets/rallies/ temp holiday sites,
120amp battery, leds in all light fittings some warm some white, low amp tv (the tv was only ever used periodically bad weather etc), radio /cd player with its own batteries, everything else from the gas supply, cooking, making toast, boiling a kettle, also percalating coffee with one of those italian percalators (that can be used on gas or elec rings), water heating, gas heating system.
We used to caravan/camp for well over a week with just that 1 battery, hitch up drive somewhere else and do it again
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets