Before you call - on my website http://www.solarsteve1950.com
on the home page there is a solar power calculator to download free - It will help calculate your system and useage ...
Just check your power adapter for the laptop it will have an output current rating as will all the other electrical items you want to power .. Just transfer these and the estimated hours you will use them on a daily basis - Put in a battery size ( ie 58aH or whatever) then see how many days you can stay without 240v mains power - At the bottom you can also add in Solar Panels and again it will show you how long you can stay without mains .. both sunny and cloudy days are shown -- This is obviously not foolproof as the variables are many but it can be a very good guide to budgeting and your use -
You may find for example that the battery might last 3 days under your normal useage and that might be enough for your style of camping ...
Try it out and if you get into difficulties send me the spreadsheet by email and I'll explain it for you ..firstname.lastname@example.org