Perhaps 8 weeks, this year we will be up there. I have stayed as long as 3 mons in the past (with no phone back then). (no running water or electricity, and only a small generator for emergency power).

Before getting the smart phone, I ran our inexpensive Nokia brick type off an Energizer 2 AA travel batt, and also off the Car Charger, which we bought at WalMart.

But the smart phone iPhone 4S is 4G and eats the battery quickly if I come on here to read, answer posts or moderate anything. We did buy a couple of needed large things on Amazon last summer off the phone and had them delivered up there. That was very handy. (it is a full day travel to Sault Ste. Marie US...in order to get anything substantial. The local grocery is adequate but does not have a large selection of food...not even much cat food-- as it is mostly a dog town).
This is only our 2nd summer with the smart phone.

We like the idea of a solar charger. Last year we planned on getting a solar thing and maybe a backup battery, but after reading the reviews on Amazon...I am horrified at how many failures and poor manufacturing quality I am seeing there.
There are even engineers claiming to have tested these items and found the wattages are misrepresented etc.

I was hoping someone here has used solar recharging for electronics, and has a recommendation for us.
So far we are leaning towards this:
http://www.amazon.com/dp/B00FABKX7E/...I1WWLCD5PSHUAZ

Perhaps a storage battery will be done later if at all?
Or nothing at this time, and we will charge in our cars like last year (which is not everyday)? Endure the stinky generator (if it works that is), for some charging at night if we turn on lights instead of our LED lanterns. We both have iPhones 4S...but only I have the higher featured internet gigabytes in my plan.

So last season was only 4 wk stay...since hubby was still working. He is now retired, so we can stay longer, and that makes solar look more helpful.