Let's look at the first question and come up with some  relevant answers.
Solar 
must power  inverter Energy Defined
So, what is solar energy? Put quite simply, it's radiant  heat and light that comes from the sun, which is something that we as humans  have tried to take advantage of through the centuries via the use of different  technologies.
As far back as the 7th century BC, the ancient Greeks used  glass and mirrors to harness the sun's energy for heat. In the 18th century,  Swiss scientist Horace de Saussure invented the "hot box", which was  the precursor to solar 
fct  terminal energy. In the 19th century, French scientist Edmund Becquerel  that certain materials, such as selenium, reacted with sunlight to generate  small electrical charges. This discovery was named the photovoltaic effect and  lead to the development of what we now know as solar panels and photovoltaic  technology.
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