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Your Position: > Knowledge >> Solar system >>> new PV system help you to improve your engery life!

new PV system help you to improve your engery life!

Cindy / 2014-03-01
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There is sunshine, there is energy. WELLSEE- First Choice for PV How PV works PV cells convert sunlight into electricity by an energy conversion process. In most PV cells, photons (light energy) hit the cells, exciting electrons in the atoms of a semi-conducting material. Silicon is the most commonly used semi-conductor. The energised electrons result in the generation of an electrical voltage. In other words, electrons flow, producing direct current (DC) electricity. Where PV is used PV systems can be part of a stand-alone power system,these are not connected to the electrical distribution network. PV panels are also becoming popular in urban environments, where they may be grid-connected. Key components of PV systems PV systems are typically made of these key elements as following: 1.PV modules, cables, and mounting or fixing hardware 2.An inverter and controller 3.Batteries, back-up generators, and other components in off-grid situations 4.Special electricity meters, in the case of grid-connected systems Capacity rating of PV panels Each PV panel (or module) is rated on its peak electrical output under standard test conditions. For example, a module with a 75 Watt peak rating (75 Wp) will have a output of 75 watts under standard test conditions. Modules are available in sizes from 5 Wp to 200 Wp. A typical domestic system is around 1000 Wp to 3000 Wp. To get a total combined capacity of 1000 Wp you will need to buy a number of smaller modules and connect them to form a ‘solar array'. How much electricity do PV panels produce? The amount of electricity a PV system generates depends on the intensity of the sunlight to which it's exposed. PV still produce electricity on cloudy days, but less than with direct sunlight. Obviously PV panels generate no electricity at night, and less in the morning and evening than in the middle of the day. How much electricity you will get from your PV panels per day can be worked out when designing your system. In a whole day, a well-located PV panel will typically generate between 2.5 and 5 times its rated power output. Therefore, a 1kWp (kilowatt peak) PV panel could produce between 2.5kWh (kilowatt hours) and 5kWh per day, or between 880kWh and 1750kWh per year. Is PV right for you? PV panels work well in both rural and urban conditions. The best places to use PV is in places that get a lot of sunshine each year and where the sky is generally clear rather than cloudy. PV works best in north-facing places with year-round sun. Panels are usually installed on roofs but can also be placed on facades, conservatory roofs, sun shades, garages or specially-built stands on the ground. Make sure your site: 1.Faces north (south-facing panels are for the northern hemisphere) 2.Is free from shade and exposed to good sun all year 3.Has enough space - a typical 1kW unit needs an area of around eight square metres. If you are designing a stand alone power system, you will probably need to combine your PV array with other generators - such as a small wind turbine, micro-hydro system, or a petrol, diesel or biodiesel generator. PV Costs The cost of a solar power installation depends a lot on the site. Use this information as a guide only. Typically, solar power costs somewhere between $10 to $13 per watt, so a 1kW system will cost somewhere between $10,000 and $13,000. The cost of generating one unit (kWh) of electricity from a solar panel is calculated to be around 50c/kWh to 70c/kWh, although this can vary considerably. The cost of installation and related equipment, such as an inverter and battery bank, for a 1 kW stand-alone power system can be somewhere between $20,000 to $35,000. But the cost of solar power systems is expected to fall as production expands and technologies improve. At the same time, the price for grid electricity is expected to rise, so the cost-effectiveness of solar power should continue to improve.

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