Installing the most efficient solar panels possible can make a big difference in the actual savings you realize when you install solar panels. A more efficient solar panel will generate more electricity at a lower cost and lower amount of space taken up on your roof. This efficiency is based on how much sunlight the panel can directly convert into electricity using its silicon cells. With the sun shining on a solar panel it produces electrical output. A more efficient panel will produce more amps at a higher voltage than a less efficient panel. This has significant effects on your real-world cost savings.
Some manufacturers claim to produce more efficient solar panels than others. These claims are generally true under laboratory tested conditions, which try to simulate real world conditions but can’t match all situations.