Small Solar Panels
Small solar panels come in a wide variety of shapes and sizes as well as power output.
If you are going to build a scalable system - start out small and add to it over time - simply decide what appliances, lighting or other powered devices you would like to "go solar" with first; and calculate the power needed for those items.
You can then select the proper small solar panels needed to build just the right array for those items.
If you are going to try to greatly reduce; or even eliminate your need to purchase electricity; then you will need to take a different approach. See if your power company can give you a yearly summary of your electrical usage. You can then find your average monthly power usage throughout all seasons of the year instead of trying to factor in seasonal spikes that are bound to happen. After you have that monthly average; it is a really good idea to add 10% - 15% to that total just to cover any additional needs you may have if you add some new powered appliance or device.
Then, you are going to need to determine the average number of hours of sunlight at your location. You can simply do a web search for an "insolation map".
Insolation maps show a regional breakdown of the U.S. or North America (I'm sure you can find one for your part of the world if outside of North America), assigning each region a zone number. By checking your zone number against a chart, you will see that your particular region will have somewhere between 3.5 and 6 hours of solar insolation (full sun hours) on the average day.
Using that information; you can then determine the total number of small solar panels that you will need in order to produce the amount of electricity required for your particular application.
Another thing to remember when the time comes to buy your small solar panels is that you can often get really great discounts by purchasing panels that have slight chipping on the edges or corners - they will work just fine but they are discounted due to cosmetic-only damage.
Think of buying small solar panels at a "scratch and dent sale!
Click This Link To See A Great Step By Step Plan That You Can Use.