How much you will earn and save from installing a solar PV system will be dictated by a number of aspects relating to your property and the type of solar PV panels used. These aspects are broken down into logical steps below to help you make preliminary decisions about whether solar PV is for you.
1. How many solar panels you have space for on your roof or in your garden? – The more room you have, the more panels you can potentially fit hence a bigger sized system which will generate more electricity and money.
2. Which direction are the solar panels to be facing and at what angle will they be fitted? – The orientation and the angle will dictate the amount of light falling on the PV cells, this measurement is known as a SAP figure and it is vitally important that the correct figure is used otherwise the predicted output will not match the installed systems output.
3. What output wattage are the panels? – are the panels 180/220/230/240w panels? The bigger the output wattage means a bigger overall system BUT check the output tolerances and also what performance warranties the manufacturers give – See the choosing solar PV panels section here