Cells can be amorphous, polycrystalline or mono-crystalline. Amorphous are the least expensive and the least efficient. Polycrystalline and mono-crystalline cells are more efficient and more expensive. These differences in efficiency ratings should be considered when deciding on a system. Select panels that will produce more energy than you are consuming to ensure you have enough to meet your needs. To have the ability to increase the capacity of the system, choose panels that can be added to another.
On-grid is the most beneficial category to maintain constant power and to sell excess electricity back to the electric company. This should be done by a qualified professional to ensure that the system grid point that enters the house is correct and so that you do not lose current power. Off-grid is less common because you are not tied into the power line and will be completely on your own for electrical power.
Deciding where to put the solar panels is an important consideration. Although roof mounting is the best option, some roofs will not support the weight of the system. Determine the roof's load-bearing capabilities before you decide. If the roof is not strong enough, elevate the panels on poles and face them south. Panels receive the most sunlight between 9 a.m. and 3 p.m.
The solar system will not operate efficiently if there are obstructions such as tree branches or other objects casting a shadow over the panels. To improve the panel's capacity to capture sunlight, add a solar tracker to follow the sun during the day and move the panels accordingly. Since trackers need electricity, confirm that the panels will cover the tracker's energy needs.