Full charge=no but enough to turn over your engine.
How long is a piece of string?
It depends on the strength of the sunlight and how many hours of strong light you have.
and depends on how many amps you need to turn over your engine- (not just pressurise the fuel system) check your manual for data.
Depends on the state of your battery
and so on-
Then you need to do some maths!
If you were to leave your bike parked for a long time- a small panel (say 5watts) will trickle charge the battery but then, the chances are, the panel might get pinched..
If this is a huge concern for you- seems to me you may wish to consider buying the '200' model
But it's more money & more kit- always more kit

!!!
or you might want to carry a bike set of jump leads- better/cheaper and gets you to meet the locals too!
And if going in search of empty places..... I would encourage you to learn about your bike as much as possible, think laterally and innovate! too many 'what if' scenarios' !!
and when it comes to bm-wobble -U's... I would not go anywhere without my '911' diagnostic dongle- Takes all the head-scratching out of it-
BTW can you fix a puncture?
video of the '200' in action on a quad
here