Off grid solar power system also called independent photovoltaic power generation system, it means don’t depend on the power grid to operate soly pv power system. Except for the solar panels, inverter, it must equip with charge controller and big capacity battery. The principle of solar power system is to storage the electricity in battery when panels generate. And it will output from the battery when needed.
According to the different function, solar electric power system also can be divided into pure DC- power system and DC-AC power system. Pure DC power system is only suitable for driving DC overload, such as DC light, water pump, fans and TV ect… generally speaking, usually solar street lamp, garden lamp and small DC lighting system as like 5W, 10w, 30w. These are pure dc-power system; while DC-AC power system have 220V AC output voltage, that is to say, these are suitable for different kinds home electric appliance, usually above 500W system can output 220V output electricity.
On-grid solar power system means the system connected to the public supply, coordinate power generation system to household with the electric supply. In our country, it already have been connected to the public supply system for free, except for their own electricity, the remaining electricity can also sold to the state. Besides , on grid also divided into energy storage system and without energy storage device power system. When the weather is good and have enough generating capacity, it is no matter whether there is energy storage or not. But if you encounter rainy days, when the electricity supply have been broken down, energy storage system can be used for a part of the electrical use, but without energy storage system can not be powered up.
In a word, it will be much convenient if there is a small energy storage system --- portable solar generator when outage. More information, you could try http://www.poweroak.solar/
Written by Sarah Hwong, Jan 25,2016
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