(Image: https://www.publicdomainpictures.net/pictures/250000/t2/solar-panels-151541185456U.jpg)To ensure you get the best possible deal, it is wise to compare the dealer fees and interest rates offered by different installers. This way, you can make an informed decision based on the most favorable terms available.external site First, there is a cash purchase, which in most cases provides the best price and long-term savings, but the upfront payment is not always what you can afford.