Solar Energy Systems,Solar Home System

Solar Energy Systems,solar home system,Solar Energy System,Portable Solar

energy System,solar power system,solar,Solar Energy
description:
The small type solar grid tie power inverter can obtain the solar energy from solar

panel, and can tie to the grid through its output cable with no extra equipment. The

installation is very convenient and reliable.
We call the system combining with small solar grid tie power inverter and solar

panels as ‘SGPV’. The system includes solar panels and small type grid tie power

inverter. Solar panels can be mono silicon, polygon silicon, non-crystal film or any

other material that can transform solar energy to electric energy. The power of grid

tie inverter should be matched to the power of solar panels connected. So the power

of SGPV is defined by its solar panels, it can be standardization according to the

actual using.
The inverter can be connected to any outlet at home, when this line run by the

conventional electric network. The small grid tie monitors the volume, frequency and

phase of the home grid, then produce a pure sine wave that the frequency and phase

are as same as the grid's, and the volume is a bit higher than the grid's, then

according to the current controlled PWM, to control the output power to the grid. The

small grid tie inverter just puts out power when the home grid is on.
When the sun shines, the PV panel will produces DC voltage, and the grid tie

inverter will change the DC voltage to AC voltage and puts out power to the home

grid. When the total power of electric apparatus that are using in the house is

larger than the output power of the inverters, these power from the inverters will be

consumed in the house, this will slow down the power meter, otherwise, the difference

of the output power of the inverter between the total used power of the apparatus

will go out from the house to the out grid, this will make the power meter backwards.

BACKGROUND:

Today's society, oil, coal and other fossil fuels become increasingly strained and

eventually will be completely exhausted, so solar energy, wind energy and other

renewable energy sources are inevitable directions in the future development of the

energy field. So promoting large-scale solar photovoltaic power is an important way

to solve the problem of the world's energy and environmental crisis.
PV power systems need a supporting body (installation place). One is using of open

ground, such as desertification of semi-desert region, beach, farms to build large-

scale PV power station. As same as traditional power plants, this kind power station

need to construct long-distance transmission grid, the investment costs are high, and

it will cause wear and tear during transmission.
The other is the promotion of photovoltaic building integration (BIPV). In this way,

to build in the PV power system with all types of buildings of the cities, make full

use of the building walls, windows, sunshade and other resources to expand the area

of a solar energy generating electricity system.
"SOLAR ROOFS", it indicates to gather the solar energy from every home’s roof. This

initiates a new mode of clean renewable energy - "near production, local

consumption". Both environmental protection and energy saving are realized, the land

is conserved and the cost is reduced. It has now become a competition to encourage

governments around the world to promote the new energy production methods.
How to tie the “million solar roofs” to the grid is a great obstacle, and it is a

key to promote the “Solar Roofs”. The SGPV is a powerful method to solve this

obstacle.

ADVANTAGE:

There are many advantages of SGPV compare with the traditional grid tie system.
1. Low cost and easy installation - SGPV can make full use of all types of buildings

’ surface that face to the sun in the city as well as fast and easy installation of

solar modules and grid tie inverter. It's very low maintenance costs.
2. Free combination - SGPV can be used as a separate grid tie system and can be setup

as a large solar array with many of them. The quantity of SGPV in the array is just

according to your desire. If you are planning to install a grid-tie PV system, in a

general way, the solar array and inverter need to be carefully matched to ensure that

the inverter’s voltage and power limits are not exceeded. When you want to increase

more solar panels, and if the total power of the solar panels exceeds the allocation

grid inverter, it is necessary to increase the cost of a grid inverter.
3. Combination of SGPV does not interact - The traditional solar grid tie system,

they offer units ranging in high power output and these units are modular so you can

have multiple units operating in parallel for large solar arrays. Although, the

traditional grid inverter has MPPT feature (Maximum Power Point Tracking), but the

maximum power point is according to the entire series in terms of solar panels array,

if the performance of a piece of solar panels in the system, for some reason, such as

leaves, bird droppings, dust, shadow, etc., degrades, the performance of the entire

solar power system will decrease.
SGPV has no such disadvantage. If the performance of a piece of solar panels in the

system degrades, this just effects this piece itself, will not affect other SGPV in

the system.
4. Improving the efficiency of the entire solar power system – In traditional grid

tie system, the solar panels are connected in series, so the MPPT of the inverter is

according to the total panels in series, not to every panel, but there is difference

between every panel, so not every panel is working at the maximum power, this will

reduce the total power of these panel in series.
But SGPV has no such disadvantage. Because every inverter of SGPV has MPPT function,

so every panel is working at the maximum power, this will increase the efficiency of

the entire system.
5. Low power consumption – Most of the parts in the small grid-tie inverter are

digital ICs and low power MCU, so the power consumption of it is low, though the

quantity of grid tie inverters is increased, but this will not increase the power

consumption of the entire system.