As of 2015, a few good locations that offer off-grid solar power systems online are Wholesale Solar and Mr. Solar. Both companies sell products through their websites, as well as by phone.
Wholesale Solar aids customers in determining the correct size of solar system needed and how much electricity the location will need to generate. Pricing and system information is available on the site.
Mr. Solar is a Better Business Bureau-accredited company that sells off-grid solar systems. Solar technicians are available for design consultations, pricing and installation.
Northern Arizona Wind and Sun is another reliable company that sells off-grid products. Solar calculators, product resources and sale items can be found on the company website.