If you're interested in a particular solar panel model, determine when this panel was created. There are very efficient modern solar technologies; however, iffy solar energy salespeople sometimes sell old technology. This older technology is more affordable but you will get much better results with a more recent product.
If you cannot afford a full-scale solar energy system, consider investing in a smaller one. Some vendors offer small systems designed to power a water heater or a generator. This small investment should help you save money within the next few years and you can easily expand your solar energy system by powering more appliances with solar panels.
Most Efficient Solar Panel.
When it comes to solar water heaters, be realistic. They're typically only 30% more efficient than any other form of water heater. Second, don't think that just because you shower in the dark means you'll have to deal with cold water. Water heated by solar power should stay warm for 24 hours.