We did four weeks in a Beach and five in a Cali SE and both are fine. Just pack super carefully and think what you really need. The more you do it the more you can refine, trim, be clever with the storage.
If anyone but anyone is thinking I should go solar then do it! Absolute best thing we did for our Cali full stop - I recommend simply shelling out for Roger's set up although if you are a bit DIY minded you can (as I did make my own set-up) save a fair bit.
One 100w panel and fit to the rails, absolutely go for the Victron Bluetooth set up with app so you can monitor it from your phone - it is truly brilliant and you have a wonderful smug feeling of endless peace of mind knowing you never need worry about power again, hook ups (both the hassle and cost!), battery deterioration, etc. Easy to fit and remove too. Go for the larger controller so you can add another 100w if ever needed.
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