That probably depends on your definition of "everything". But if they are entirely solar and the sun keeps shining they should power it for quite a lot longer than a weekend. If you're talking about a battery with a solar charger, you can easily work out if the battery will suffice for a weekend (Ah capacity x battery voltage = Watt.hours e.g. a 12v 70Ah battery will supply 840 Watt.hours), and Wikipaedia (http://en.wikipedia.org/wiki/Photovoltaics, under 'Advantages and disadvantages') gives global average insolation as 170W/sq.m, so you can work out how much to expect from the pv array in terms of charging current (more if you live where it's normally sunny!).
Here in the UK we don't have enough sun to consider solar power for anything other than very low power, or else permanent, installations. And permanent installations only seem to available through cowboy "government approved" installers.