If you are planning on meeting with a consultant to install a solar panel system, you need to make sure you are prepared. Have a list of all electrical appliances along with their wattage and the number of hours you use them on hand. Any good consultant will need to know this information before a solar panel can be installed.
See how to test your solar panel for open voltage and current reading. Results will vary depending on sun strength, time of day, angle of light and temperature.
Carefully consider the types of solar panels you plan on having installed. Long ago, if you didn't have enough roof space, you'd need very expensive high efficiency mono-crystalline panels. There are now more advanced polycrystalline panels and even thin film panels. If you've got enough roof space, you might wish to look at the size of the panels in relation to their output capacity to avoid having insufficient panels that you need more of later.