Solar Panels

 
Solar panels are devices that convert light into electricity. They are called “solar” panels because most of the time, the most powerful source of light available is the Sun, called Sol by astronomers. Some scientists call them photovoltaics which means, basically, “light-electricity.”A solar panel is a collection of solar cells. Lots of small solar cells spread over a large area can work together to provide enough power to be useful. The more light that hits a cell, the more electricity it produces, so spacecraft are usually designed with solar panels that can always be pointed at the Sun even as the rest of the body of the spacecraft moves around, much as a tank turret can be aimed independently of where the tank is going.
 
 
Multi-crystalline (Polycrystalline) Solar Panels
 
A polycrystalline cell contains many crystals. It has similar life span to the monocrystalline cell type, but it has lower efficiency and cost per watt.
 
Mono-crystalline Solar Panels
 
A monocrystalline cell is made of a single crystal. Monocrystalline solar panels are high efficiency solar panels.
 
 
How much watt solar panel we need?
 
Example we want to power up 5 lights of 20 Watt and we need to use these 5 lights for 3 hours every day. Here first we get a total watt usage. Ptotal = 20 * 5 = 100W. Than we multiply 100 with 3 hours. Pdaily = 100 * 3 = 300W. We are going to use 300 watt daily. Let us say we are going to have complete sunshine 6 hours each day. Now we divide 300W with 6 hours, so we will get hourly power charge that we need P-hourly = 300 / 6 = 50W. So we need a 50 watt solar panel. But it is recommended to always choose a panel some bigger then we need. Because when solar panel charge the battery so it is wasting some power on charging too
 
Quality of solar panels
 
We recommend to buy solar panels of good quality. If you is really looking for panels that can be used in 20-25 years without have massive loss so we recommend you to buy quality solar panels. Because normal quality solar panels have a about 1% or less yearly loss of energy each year. So it mean if you use them 20 years so they will have a loss percent of 20%. So a 100 Watt panel will produce 20% less then what it produced when it was new. 100 watt minus 20 it is equal 80 watt. After a 20 years usage in direct sunshine a solar panel will produce 80 watt.
 
If a panel just begin to produce less power just after 1-2 years usage so it is not a good quality. You have just loss your money on bad panels