People how to improve the economic benefits of rooftop solar
People spend hard-earned money in the roof of our house construction of photovoltaic power plants, that day in bed can stabilize get subsidies, electricity sold to take profits. In actual fact, there are many things you need.
Regardless of which economic sectors are in the final comprehensive index to measure all economic activity. People in their own roof to build power plants, is a brave attempt, but also a risk investment, many people do not know how their economic power plant considerations. In fact, nothing more than very simple from the cost, power quality, power generation to be considered.
To the people through photovoltaic power plants, access to sustainable income, to have his heart steelyard, there is a measure, we first need to control the cost of building power plants, modules, inverters followed by power stations and other quality sufficient to meet 20--25 years of life , there is stable power generation.
That is simple, but really do not so easy to go to practice, how to do it? Today we have the main equipment selection, system configuration, operation and maintenance and so on four aspects to analyze and see how to improve the economic benefits of photovoltaic power plants.
First, the selection of equipment
For PV modules:
1, to improve the conversion efficiency: it helps to reduce the area, bracket, DC cable, construction, installation and other investments, but efficient components more expensive. The present situation is to make ends meet.
2, to reduce the attenuation: the current 25 years to 20%. As reduced to 15%, 25-year average generating capacity increase of 2.5%.
3, to improve consistency: consistency module strings affect approximately 2% -10%, usually take 3-4%, there is no actual test data.
1, to improve the conversion efficiency: currently about 96% -98%, 97% of the general requirements, space-optimized 1% -2%
2, application of new technologies: Distributed inverter and 1500V inverter, in addition to efficiency, the DC line losses can be reduced 1% -2%.
Second, the system configuration
1, the DC voltage generating unit and lift capacity increases:
Enhance the DC voltage: DC can reduce line losses and DC cables, combiner box investment, in order to increase the capacity of power generation units to provide favorable conditions.
Increasing the power generation unit capacity: Inverter booster station can reduce investment, inverters, AC cable box changes and costs.
2, the power generation unit of PV modules over with:
Investment increase: increase photovoltaic modules, covering, bracket, DC cable and other investment, accounting for approximately 60% of the investment unit.
Incremental Generation: In overweight 10%, for example, from about 8% to 9% increase in power generation
Incremental cost-effective power generation: about 2% -3%
Third, the layout of PV modules
1, manually adjustable bracket system
Increased investment: Bracket cost increase of about 0.2 yuan / w, about 2.5% of the investment unit.
Incremental generation: increase of about 5%
Incremental cost-effective power generation: about 2.5%
2, flat single-axis tracking system:
Investment increases: 4.7 per cent of the total investment.
Incremental generation: increase 15% -20%
Incremental cost-effective power generation: about 7.5% -12.5%
3, oblique single-axis tracking system:
Increased investment: the cost of the bracket, covering 10% of the cable, about the total investment.
Incremental generation: increase 20% -26%
Incremental cost-effective power generation: about 9% -15%
Fourth, the operation and maintenance optimization
1, cleaning and maintenance: the module surface fouling affect approximately 2% -10%, and generally 3% -4%, but wash the local water conditions on large, space-optimized from about 1% to 3%
2, intelligent control and management: intelligent control system enables the performance itself into full play, and efficient management can promptly identify problems and timely treatment, to ensure the system is efficient and stable operation.
Summary: The space-optimized article mentioned, we stand idealistic point of view, in fact, some parts of the optimization space can not be reached, the power plant in order to obtain a large economic benefits, taking into account all aspects, nor is it clear a few hundred words can be analyzed .