Case Studies

Off Grid Solar Power System

There are many remote areas that power line can not reachable such as desert, polar region, mountain and island etc. At where the well-design solar stand-alone system will provide stable electricity power for observation stations, repeaters, research lab and so on. According to various loads and local weather conditions, the power station will have different capacity of solar panel and battery. The solar-generated power storages into the battery bank during the daytime and provide the load as required.

For the importance, the system must be designed conscientiously. Two main principals are: The generated power must larger than the load on long time average. And the capacity of battery must overcome any bad weather condition. At high latitude areas, the length of sunshine is very asymmetric between different seasons. For getting stable energy, the system always joins wind generators or diesel generators.

Thus, a inverter with power management function such for power switch, generator starter, green power is necessary for the kinds of systems. Xantrex manufactured SW and SW plus series inverters are very ideal and with reasonable price for the kind of application.

Planning Concepts
To design a stand-alone system, the scale of PV array must be decided first. This system must provide enough power for loads all the year no matter winter, summer, and sunny or cloudy days. Therefore the system design should consider the worse weather condition but not the average condition. This is the main difference from grid-tie system design.

Grid-Battery Interactive Solar System

At remote areas the grid is often broken by disasters. A Grid-Battery interactive solar system will provide essential power for lighting, communication and nursing etc. during the disaster periods.

A Grid-Battery interactive solar system has both functions of stand-alone and grid-connection. On ordinary days, the system-generated power connects to the grid line as a grid-tie system. During the disaster period, the system switch to stand-alone mode and output the power from the battery to a specified panel for important loads. The PV generators will still charge the battery to replenish the capacity.

Planning Concepts
Grid-battery interactive solar power system works like grid-tie system as utility normal, but can provide emergent power as utility failed. It was often installed at where the utilities untable areas and some important locations. It can reach two targets of emergent power providing and energy saving. When utility failed, the system breaks away grid-tie mode and switch to stand-alone mode. In stand-alone mode, the inverter transfers the energy storged in batteries for specified loads. These specified loads are commonly lighting, medical and communication equipments, these circuits are collected in an urgent sub-panel.

Wind Power System

A resource of wind energy power is free and renewable. The output of a wind energy power depends on the wind's speed through the rotor. To estimate a good wind site for wind generator is extremely important to the performance of the machine.

Wind power supplies affordable, inexhaustible energy to the economy. Best of all, wind powers the economy without causing pollution, generating hazardous wastes, or depleting natural resources.A small amount of noise is generated by the mechanical components of the turbine. Before installation do need to survey the environment.

A resource of wind energy power is free and renewable. The output of a wind energy power depends on the wind's speed through the rotor. To estimate a good wind site for wind generator is extremely important to the performance of the machine.

Wind power supplies affordable, inexhaustible energy to the economy. Best of all, wind powers the economy without causing pollution, generating hazardous wastes, or depleting natural resources.A small amount of noise is generated by the mechanical components of the turbine. Before installation do need to survey the environment.

Small Wind power Application
Large scale wind power generators (>600kW) manufactured by professional company, we don’t introduce on this article. Our web site provides no more than 10KW wind power generators.The wind power energy can be used by farm, home and small factory. A few models can connect to the grid or storage the power in battery.

1.There are a number of models available for wind electric water pumping systems and don’t need battery.
2.Use both small wind and photovoltaics panels to provide power for platform lighting.
3.Use small wind generators for providing power on their offshore platforms and for monitoring sites.
4.Find a site with ideal wind speed and avoid vegetation and buildings.
5.Wind speed can increase dramatically with height, the higher the better.
6.The tower of wind turbine must be safe. Adherence to recommended instruction from the manufacturer is preferable. Individual design must be under the supervision of a professio- nal technician.

There is always vibration noise of wind turbines, it is not recommended to install at where acoustic noise could cause problems; alternatively, small wind turbines are less noisy with a low whirring.

BIPV System

One of the most promising renewable energy technologies is photovoltaics. Photovoltaics (PV) is a truly elegant means of producing electricity on site, directly from the sun, without concern for energy supply or environmental harm. These solid-state devices simply make electricity out of sunlight, silently with no maintenance, no pollution, and no depletion of materials.

There is a growing consensus that distributed photovoltaic systems that provide electricity at the point of use will be the first to reach widespread commercialization. Chief among these distributed applications are PV power systems for individual buildings.

Interest in the building integration of photovoltaics, where the PV elements actually become an integral part of the building, often serving as the exterior weather skin, is growing worldwide. PV specialists and innovative designers in Europe, Japan, and the U.S. are now exploring creative ways of incorporating solar electricity into their work. A whole new vernacular of Solar Electric Architecture is beginning to emerge.

A Building Integrated Photovoltaics (BIPV) system consists of integrating photovoltaics modules into the building envelope, such as the roof or the façade. By simultaneously serving as building envelope material and power generator, BIPV systems can provide savings in materials and electricity costs, reduce use of fossil fuels and emission of ozone depleting gases, and add architectural interest to the building.

While the majority of BIPV systems are interfaced with the available utility grid, BIPV may also be used in stand-alone, off-grid systems. One of the benefits of grid-tied BIPV systems is that, with a cooperative utility policy, the storage system is essentially free. It is also 100% efficient and unlimited in capacity. Both the building owner and the utility benefit with grid-tied BIPV. The on-site production of solar electricity is typically greatest at or near the time of a building's and the utility's peak loads. The solar contribution reduces energy costs for the building owner while the exported solar electricity helps support the utility grid during the time of its greatest demand.

Solar Lighting System

Home lighting System are powered by solar energy using solar cells that convert solar energy (sunlight) directly to electricity. The electricity is stored in batteries and used for the purpose of lighting whenever required. These systems are useful in non-electrified rural areas and as reliable emergency lighting system for important domestic, commercial and industrial applications. The SPV systems have found important application in the dairy industry for lighting milk collection/ chilling centres mostly located in rural areas.

The Solar Home Lighting system is a fixed installation designed for domestic application. The system comprises of Solar PV Module (Solar Cells), charge controller, battery and lighting system (lamps & fans). The schematic of the HLS is given below. The solar module is installed in the open on roof/terrace - exposed to sunlight and the charge controller and battery are kept inside a protected place in the house. The solar module requires periodic dusting for effective performance.

Solar streetlamp use for somewhere no electricity or for indicator, the strength is not restricted on electricity line. It is convenient and also build landscape for place that need arrangement.? The solar street lamp is stand-along system , focus on the battery service life, the battery life is generally about three years, and can be increase or reduce the service life. Please contact local distributer or technical staff of our company for details.

Other System

Generally, the solar energy generating equipment can only connect with a specific computer. The computer has collected the solar equipment to work a round of the date. It is process must to be using that can be complete. The date will be limited by area while observing and collecting measurements.

If the experiment date will be transmission to the other computers. The research can be everywhere and share the date to pay attention to the world for someone interest. The system is “internet surveillance System” and “internet multicast system”.Hengs provide for that demand and design to symbolize in touch the proprietor is different common system. It is functional and aesthetic.

1.DC/AC、electric current、electrical production capacity.
2. Customer introduction.
3. Mean of LL and HL.
4. Temperature of module.
5. Alternating current capacity.
6. Today electrical production degrees.
7. Accumulate of electrical production capacity.
8. Reduce carbon and time.

Building a wind generator from scratch is not THAT difficult of a project. You will need a shop with basic power and hand tools, and some degree of dedication. Large wind generators of 2000 Watts and up are a major project needing very strong construction, but smaller ones in the 700-1000 Watt, 8-11 foot range can be built fairly easily! In fact, we highly recommend that you tackle a smaller wind turbine before even thinking about building a large one. You'll need to be able to cut and weld steel, and a metal lathe can be handy (though you could hire a machine shop that turns brake rotors do do some small steps for you).

In most locations, GENTLE winds (5-15 mph) are the most common, and strong winds are much more rare. As you'll see by examining our latest machines, our philosophy about designing wind turbines is to make large, sturdy machines that produce good power in low wind speeds, and are able to survive high wind events while still producing maximum power. The power available in the wind goes up by a factor of 8 as the windspeed doubles.


Other critical factors are rotor size and tower height. The power a wind turbine can harvest goes up by at least a factor of 4 as you double the rotor size. And making a tower higher gets you above turbulence for better performance and substially increased power output. Putting a wind turbine on a short tower is like mounting solar panels in the shade!