BFL13 wrote:
Meanwhile you just bought a washer and dryer for the trailer so that means you intend to have shore power when you camp after you retire next year...
Or that means they don't know their future RV style - how, where and for how long they will camp. They only know that mostly it will be shore power.
Agreed with the rest of BFL13 post - for those odd 3-4 days when not on shore power, just get another pair of batts and inverter powerful enough to run what you have to run. For TV and small electronics 150W inverter for $30 will do. Microwave and other 120V kitchen items will take you immediately to 1800-2000W inverter range, and will require much stricter control over energy spending, but still possible with 4 GC batts for 3 days. All is fine as long as you don't need airconditioner.
Be careful with Loads section of that N8GS spreadsheet. Some items are repeated in different lines, like fan or lights - depending on what fan and what lights. Properly used, it will give you a good idea of your energy needs.