> Quick answer: Cloud cover reduces but doesn’t eliminate photovoltaic (PV) power generation; shading can cause significant losses or damage; south-facing panels maximize annual output [12][6][7].
In Romania, where sunlight availability varies significantly throughout the year, understanding how factors like cloud cover, shading, and panel orientation affect solar lamp performance is crucial. This article will delve into these elements to help you optimize your solar lamps for better energy yield.
Cloud Cover: Diminishing but Not Eliminating Power Generation
Cloud cover reduces the amount of solar irradiance reaching PV panels, thereby diminishing power output [12]. However, even under partially cloudy conditions, solar panels continue to generate electricity at a reduced rate. In experimental settings, translucent paper sheets were used to simulate cloud cover, revealing that thicker clouds result in lower peak power output [6].
Despite these reductions, systems equipped with sufficient battery storage can still meet lighting needs over multiple cloudy days. This is evident from the operation of solar-powered street lights through extended overcast periods, including in January [10]. However, the sources do not specify how much storage is required or how efficiency degrades under prolonged cloud cover.
Shading: Complex and Disproportionate Impact
Shading has a more complex impact on PV performance than cloud cover. Unlike uniform reduction caused by clouds, shading—especially partial shading—can cause significant electrical imbalances within a PV module [7]. When some cells are shaded while others remain exposed, the unshaded cells become forward-biased and shaded cells reverse-biased. If the reverse voltage exceeds the cell’s breakdown voltage, a „hot-spot” phenomenon occurs, potentially causing irreversible damage [7].
To mitigate partial shading effects, bypass diodes allow current to flow around shaded cells, reducing the risk of hot spots [8]. Soft shading (e.g., air pollution) primarily reduces current while keeping voltage stable. Hard shading (e.g., dust or solid obstructions), however, can block all light from affected cells and cause substantial drops in output even if some cells remain exposed [8].
Panel Orientation: Maximizing Solar Exposure
Panel orientation is critical for annual energy yield. In Romania, orienting panels to face south maximizes solar exposure due to the sun’s path across the sky [13][14]. This principle applies both to rooftop installations and ground-mounted arrays [15]. The optimal tilt angle generally increases with latitude; higher latitudes require steeper panel angles to capture more direct sunlight [13][14].
However, orientation also affects performance during peak demand periods. Solar radiation peaks around noon, but electricity demand often peaks in the afternoon or early evening [13][14]. A slightly eastward tilt might improve late-day output, though the trade-off is not quantified in practice.
Innovative Design and Performance
Innovative design, such as integrating solar panels into lampshades, can compensate for suboptimal placement. This dual-purpose design increases the effective area exposed to sunlight, improving energy yield even when lamps are placed less than ideally [20][23]. Rain can help clean panels, removing dust that reduces efficiency [12].
One patent explicitly states that PV used in solar lamps achieves a „relatively good yield” even under non-optimal exposure conditions [20]. This demonstrates that design innovation can make solar lamps more resilient to user error.
Key Takeaways
- Cloud cover reduces but does not eliminate photovoltaic energy generation.
- Shading can cause significant electrical imbalances and potential damage, but bypass diodes can mitigate these effects.
- Panel orientation is crucial for maximizing annual output; innovative designs can compensate for suboptimal placement.
References
- [6] Activity_Characteristics_of_Photovoltaic_Solar_Cells_-_ADALM1000__b213070d — authority
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you determine the relationship between the peak power output of the solar panel and thickness of experimental “clouds”? Additional Materials: a few sheets of 8“ X 11” white translucent paper ( wax paper may be a good choice ) , radiation lamp with 150W bulb, meter stick, ring stand with clamps. This part of the lab will simulate how the solar panel is affected by varying amounts of cloud cover using sheets of somewhat transparent or translucent paper to simulate cloud thickness. You will be looking to see if there is a mathematical relationship between cloud thickness and voltage x current output of the panel. The voltage produced is not the true measure of energy being collected in this situation, current and peak power will better show the relationship we are looking for. Determine if changing the angle of your panel over time to follow the Sun would add up to substantial savings in your energy bill? You will need a protractor or clinometer to measure the angle of the panel to the incident sunlight. Much is made of the amount of energy lost by fixed Photovoltaic systems because they don't always point with the optimal angle of the sun. In this lab you should investigate how changing the angle of your panel varies the amount of current produced by the panel, and how that would relate to a typical energy bill. You will need to perform this lab at a time when sky cover is very consistent. It is preferable to have sunny skies, but a uniform cloud cover will work. For Further Re
- [7] US20150188415A1_-_Photovoltaic_systems_with_maximum_power__0defa108 — patent
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Sixth IEEE Photovoltaic Specialists Conference—1997, 1997, pp. 1129-1132—incorporated herein by reference), Kawamura et al., (“Simulation of I-V characteristics of a PV module with shaded PV cells,” Solar Energy Materials and Solar Cells, vol. 75, no. 3-4, pp. 613-621, February 2003—incorporated herein by reference), Patel et al., (“MATLAB-Based Modeling to Study the Effects of Partial Shading on PV Array Characteristics,” IEEE Transactions on Energy Conversion, vol. 23, no. 1, pp. 302-310, March 2008—incorporated herein by reference), and Patel et al., (“Maximum Power Point Tracking Scheme for PV Systems Operating Under Partially Shaded Conditions,” IEEE Transactions on Industrial Electronics, vol. 55, no. 4, pp. 1689-1698, April 2008—incorporated herein by reference). This situation may happen due to passing clouds, dust or snow covering the PV panel, shadows of trees or birds litters. In partial shading state the un-shaded cells of the PV panel become more forward biased and the shaded cells become reverse bias. When the reverse voltage increases beyond the breakdown voltage of the cell the “hot-spot” phenomenon take place and causes irreparable damage to the cell. This problem is solved by using by-pass diodes as described in Herrmann et al., (“Hot spot investigations on PV modules-new concepts for a test standard and consequences for module design with respect to bypass diodes,” in Conference Record of the Twenty Sixth IEEE Photovoltaic Specialists Conference—1997, 1997,
- [8] WO2019207599A1_-_An_automated_mechanism_for_cleaning_solar__dcc98456 — patent
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panel(s) can potentially produce more than enough energy to meet world needs. The efficiency of the solar cells depends upon the ratio of the amount of light it receives to the amount of power it generates. The power output delivered from a solar photovoltaic (PV) module highly depends on the amount of irradiance, which reaches the solar cells. Many factors determine the ideal output or optimum yield in a photovoltaic module. However, the environment is one of the contributing parameters which directly affect the photovoltaic performance. Electrical characteristics of PV (Voltage and current) are varied with respect to shading due to soiling. Shading due to soiling is divided in two categories, namely, soft shading such as air pollution, and hard shading which occurs when a solid such as accumulated dust blocks the sunlight. Soft shading affects the current of the PV module, but the voltage remains the same. For soft shading the voltage of the PV module will remain constant, and only the lower irradiance being absorbed by the solar cells leads to a decrease in current from the PV module. In the case of hard shading, all of the cells of a PV module are shaded, and no power will be delivered by the PV module. Hard shading on some cells of a PV module will cause a decrease in voltage of the PV module, but because the unshaded cells still receive solar irradiance, the current will remain constant. The shaded cell acts as a resistance to current generated from the other cells. Thi
- [10] US20120020060A1_-_Energy-efficient_solar-powered_-_Google_Patents__619c8cff — patent
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energy savings, if dimming of the light is not sufficient to protect the batteries and operability of the system. – FIG. 49 is a plot of photovoltaic cell efficiency vs. time, for many types of PV cells, wherein the preferred PV material is shown to be in the range of 12-16 percent efficiency, and typically 13%. – FIG. 50 is a plot of test data from a solar-powered pole operating without any tie to the grid, wherein the light met lighting needs through many weeks of sky cover (clouds, overcast) in a safe range for the batteries. – FIGS. 51A and B are a plot (split onto two sheets) of operation of six solar-powered poles, without any tie to the grid, operating according to an embodiment of the active control system, wherein the poles successfully met lighting needs through many weeks of low sunshine days, even through January, when the light poles met said lighting needs by being dimmed according to energy-savings modes described later in this document. – Referring to the Figures, there may be seen some, but not the only, embodiments of the invention. FIGS. 1-18 portray some, but not the only, embodiments of solar-powered light poles and lights that may form a “population” of poles for arrays and networks and/or be implemented as single or multiple, non-networked lighting poles.FIGS. 19-33E schematically portray some, but not the only, embodiments of arrays of outdoor lighting and other powered devices that are preferably managed as embodiments of the invented wireless intelli
- [12] 12_Best_Solar_Lamp_Posts_Top_Rated_Lamps_to_Buy__191c85e0 — blog
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higher elevation than surrounding structures. Solar panels will continue to function even if the light is deflected or partially covered by clouds. The rain helps your solar panels run more efficiently by wiping away dust and debris. First, make sure your solar panel is in a sunny location. The brighter it is, the more power it generates and the longer it will keep your lights on. Second, angle your solar lights so that they face south. It will provide them with direct sunlight and allow them to charge more quickly. The brightest solar lights are task lights or spotlights, and the greatest ones may produce brightness comparable to a 40-watt incandescent bulb. That is still not as bright as a standard outdoor spotlight, so in areas where you need powerful, direct light, double or triple up. Solar lights turn off automatically during the day since they convert light into energy to store in batteries. This energy is used to power the light at night. While solar lights require little to no maintenance, they require thorough cleaning to maintain efficacy during their lives. Solar street lights are the sustainable solution for extensive lighting, lowering carbon emissions and environmental impact while increasing community safety and satisfaction. Yes, even on cloudy days, solar lights charge. Although the battery does not charge as quickly, small efficient solar panels can still provide electricity when it is partly cloudy or overcast. In most cases, you do not need to manually tu
- [13] Solar_photovoltaic_output_depends_on_orientation_tilt_and_tracking__de51445c — authority
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# Solar photovoltaic output depends on orientation, tilt, and tracking – U.S. Energy Information Administration (EIA) Source: Blog/Web URL: https://www.eia.gov/TODAYINENERGY/detail.php?id=18871 Author: Date: 2026-06-18 Financial incentives, renewable portfolio standards, cost declines, and system performance improvements have led to more customer-sited solar photovoltaic (PV) installations, especially in states such as California. Because PV panels are able to capture more solar energy when they are pointed directly at the sun, installers may configure systems to optimize output by adjusting the orientation and tilt of a system, or by using mechanisms that track the sun as it traverses the sky. Installers will generally determine the tilt of a system—or the angle between the module and the horizontal—to optimize overall or seasonal performance. Assuming that a system has tilted modules, installers will generally set the orientation—or direction—of that tilt to optimize overall or time-of-day performance. In the Northern Hemisphere, the simplest way to maximize total annual system output of a fixed-tilt system is to tilt the panels south. The tilt angle may increase with latitude: the farther away from the equator, the higher the tilt. However, while solar radiation peaks around noon, electricity demand often peaks in the afternoon or early evening. In these last few hours of daylight, west-facing PV panels have an advantage over south-facing panels, as they're tilted towards
- [14] Solar_photovoltaic_output_depends_on_orientation_tilt_and__993f393b — authority
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# Solar photovoltaic output depends on orientation, tilt, and tracking – U.S. Energy Information Administration (EIA) Source: Blog/Web URL: https://www.eia.gov/todayinenergy/detail.php?id=18871 Author: Date: 2026-06-18 Financial incentives, renewable portfolio standards, cost declines, and system performance improvements have led to more customer-sited solar photovoltaic (PV) installations, especially in states such as California. Because PV panels are able to capture more solar energy when they are pointed directly at the sun, installers may configure systems to optimize output by adjusting the orientation and tilt of a system, or by using mechanisms that track the sun as it traverses the sky. Installers will generally determine the tilt of a system—or the angle between the module and the horizontal—to optimize overall or seasonal performance. Assuming that a system has tilted modules, installers will generally set the orientation—or direction—of that tilt to optimize overall or time-of-day performance. In the Northern Hemisphere, the simplest way to maximize total annual system output of a fixed-tilt system is to tilt the panels south. The tilt angle may increase with latitude: the farther away from the equator, the higher the tilt. However, while solar radiation peaks around noon, electricity demand often peaks in the afternoon or early evening. In these last few hours of daylight, west-facing PV panels have an advantage over south-facing panels, as they're tilted towards
- [15] RR-1401_Design_Challenges_of_the_NIST_Net_buildingsciencecom__8a2f2290 — authority
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is to simply incorporate as much unshaded south facing roof surface as possible; Figure 2 shows one such installation in which the entirety of the available roof is used for solar panels. Figure 2: Solar Panel Distribution on a Small North-Facing Lot Passive solar energy can be collected and transferred into the house by placing windows on the southern exposure of the house. However, too much exposed southern glazing can cause overheating in the summer and even in the winter. Therefore, careful sizing and placement of the windows and design of overhangs or other shading methods are needed in order for this solar energy strategy to actually reduce net energy use. For wind power or a ground source heat exchange loop, the location of the renewable equipment depends on other site features such as soil type or predominant wind direction. Thus a general layout of the renewables equipment on the site will inform the options for the placement and orientation of the house. In addition to orienting or placing the new house in a location that is compatible with provision of the renewable energy source, orientation for other energy reduction strategies appropriate for the climate region should be considered. For example, the orientation, layout and form of the house should be arranged to take advantage of daylighting, to support passive solar heating, to avoid unwanted solar heat gain, and to create unconditioned or semi-conditioned living space such as a three-season porch. 2.2.7 Princi
- [20] DE102015015970A1_-_Device_system_of_a_solar_lamp_-_Google_Patents__48d32ece — patent
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1. The PV used here must be exposed at an angle of about 0-30 ° to the sun and to the south to generate good power output. 2. As a result, the PV is limited to the top of a lamp and thus the area size is limited. 3. Solar lamps are usually not optimally positioned by the user to the sun, as their primary purpose is the illumination of a particular area. The PV modules are thus often in partial shade or completely absonnig. The necessary requirements according to Die in diesem Patent verwendet PV hat bei nicht optimaler Exposition einen verhältnismäßig guten Ertrag, das Problem der zufälligen Exposition einer Solarlampe wird damit gelöst. Durch die gleichzeitige Verwendung der Solarfolie als Lampenschirm und Solargenerator steht erheblich mehr Fläche zur Verfügung, was zu einem vergleichsweise deutlich hören Energieertrag führt.The PV used in this patent has a relatively good yield in non-optimal exposure, solving the problem of accidental exposure of a solar lamp. By the simultaneous use of the solar film as a lampshade and solar generator is considerably more area available, resulting in a comparatively clearly hear energy yield. Welchem technischen Problem hat sich der Anmelder gestelltWhat technical problem has the applicant faced? Eine Solarlampe soll hell und lange leuchten können. Dafür benötigt sie einen entsprechend hohen solaren Energieertrag. Die Funktion und Form einer Lampe beschränken jedoch die mögliche Größe einer integrierten PV. Durch die Wahl einer anderen P
- [23] CN102588861A_-_Curved-surface_solar_panel_street_lamp__1306b3dc — patent
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edge around the solar panel lampshade, cover scribbles light reflecting membrane along upper surface, and light reflecting membrane can be transmitted into the sunlight that shines above it on solar panel, to reach the purpose that improves illumination indirectly; (2) the solar panel lampshade leaves osculum with the intersection on cover edge, to reach the effect of the rainwater of in time draining; (3) lower surface on street lamp lampshade and cover edge scribbles reflective material, to strengthen the intensity of illumination of street lamp; (4) adopt microcontroller, the power output and the accumulator cell charging and discharging of solar panel are monitored in real time, utilize the purpose of solar energy to reach maximal efficiency; (5) adopt polymer Li-ion battery as the electric power storage battery, this battery capacity is big, pollution-free, charge and discharge cycles often, and its shape can be changed arbitrarily; (6) fully use the solar energy natural energy resources, both reached the purpose of energy-saving and emission-reduction, environmental protection again. Description of drawings Fig. 1 is a structural representation of the present invention. 1 is that lampshade, 2 is that lighting, 4 is that battery case, 5 is lamp stand for covering edge, 3 among the figure. The specific embodiment Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated. Embodiment A kind of curved solar energy cell panel s
you determine the relationship between the peak power output of the solar panel and thickness of experimental “clouds”? Additional Materials: a few sheets of 8“ X 11” white translucent paper ( wax paper may be a good choice ) , radiation lamp with 150W bulb, meter stick, ring stand with clamps. This part of the lab will simulate how the solar panel is affected by varying amounts of cloud cover using sheets of somewhat transparent or translucent paper to simulate cloud thickness. You will be looking to see if there is a mathematical relationship between cloud thickness and voltage x current output of the panel. The voltage produced is not the true measure of energy being collected in this situation, current and peak power will better show the relationship we are looking for. Determine if changing the angle of your panel over time to follow the Sun would add up to substantial savings in your energy bill? You will need a protractor or clinometer to measure the angle of the panel to the incident sunlight. Much is made of the amount of energy lost by fixed Photovoltaic systems because they don't always point with the optimal angle of the sun. In this lab you should investigate how changing the angle of your panel varies the amount of current produced by the panel, and how that would relate to a typical energy bill. You will need to perform this lab at a time when sky cover is very consistent. It is preferable to have sunny skies, but a uniform cloud cover will work. For Further Re
Sixth IEEE Photovoltaic Specialists Conference—1997, 1997, pp. 1129-1132—incorporated herein by reference), Kawamura et al., (“Simulation of I-V characteristics of a PV module with shaded PV cells,” Solar Energy Materials and Solar Cells, vol. 75, no. 3-4, pp. 613-621, February 2003—incorporated herein by reference), Patel et al., (“MATLAB-Based Modeling to Study the Effects of Partial Shading on PV Array Characteristics,” IEEE Transactions on Energy Conversion, vol. 23, no. 1, pp. 302-310, March 2008—incorporated herein by reference), and Patel et al., (“Maximum Power Point Tracking Scheme for PV Systems Operating Under Partially Shaded Conditions,” IEEE Transactions on Industrial Electronics, vol. 55, no. 4, pp. 1689-1698, April 2008—incorporated herein by reference). This situation may happen due to passing clouds, dust or snow covering the PV panel, shadows of trees or birds litters. In partial shading state the un-shaded cells of the PV panel become more forward biased and the shaded cells become reverse bias. When the reverse voltage increases beyond the breakdown voltage of the cell the “hot-spot” phenomenon take place and causes irreparable damage to the cell. This problem is solved by using by-pass diodes as described in Herrmann et al., (“Hot spot investigations on PV modules-new concepts for a test standard and consequences for module design with respect to bypass diodes,” in Conference Record of the Twenty Sixth IEEE Photovoltaic Specialists Conference—1997, 1997,
panel(s) can potentially produce more than enough energy to meet world needs. The efficiency of the solar cells depends upon the ratio of the amount of light it receives to the amount of power it generates. The power output delivered from a solar photovoltaic (PV) module highly depends on the amount of irradiance, which reaches the solar cells. Many factors determine the ideal output or optimum yield in a photovoltaic module. However, the environment is one of the contributing parameters which directly affect the photovoltaic performance. Electrical characteristics of PV (Voltage and current) are varied with respect to shading due to soiling. Shading due to soiling is divided in two categories, namely, soft shading such as air pollution, and hard shading which occurs when a solid such as accumulated dust blocks the sunlight. Soft shading affects the current of the PV module, but the voltage remains the same. For soft shading the voltage of the PV module will remain constant, and only the lower irradiance being absorbed by the solar cells leads to a decrease in current from the PV module. In the case of hard shading, all of the cells of a PV module are shaded, and no power will be delivered by the PV module. Hard shading on some cells of a PV module will cause a decrease in voltage of the PV module, but because the unshaded cells still receive solar irradiance, the current will remain constant. The shaded cell acts as a resistance to current generated from the other cells. Thi
energy savings, if dimming of the light is not sufficient to protect the batteries and operability of the system. – FIG. 49 is a plot of photovoltaic cell efficiency vs. time, for many types of PV cells, wherein the preferred PV material is shown to be in the range of 12-16 percent efficiency, and typically 13%. – FIG. 50 is a plot of test data from a solar-powered pole operating without any tie to the grid, wherein the light met lighting needs through many weeks of sky cover (clouds, overcast) in a safe range for the batteries. – FIGS. 51A and B are a plot (split onto two sheets) of operation of six solar-powered poles, without any tie to the grid, operating according to an embodiment of the active control system, wherein the poles successfully met lighting needs through many weeks of low sunshine days, even through January, when the light poles met said lighting needs by being dimmed according to energy-savings modes described later in this document. – Referring to the Figures, there may be seen some, but not the only, embodiments of the invention. FIGS. 1-18 portray some, but not the only, embodiments of solar-powered light poles and lights that may form a “population” of poles for arrays and networks and/or be implemented as single or multiple, non-networked lighting poles.FIGS. 19-33E schematically portray some, but not the only, embodiments of arrays of outdoor lighting and other powered devices that are preferably managed as embodiments of the invented wireless intelli
higher elevation than surrounding structures. Solar panels will continue to function even if the light is deflected or partially covered by clouds. The rain helps your solar panels run more efficiently by wiping away dust and debris. First, make sure your solar panel is in a sunny location. The brighter it is, the more power it generates and the longer it will keep your lights on. Second, angle your solar lights so that they face south. It will provide them with direct sunlight and allow them to charge more quickly. The brightest solar lights are task lights or spotlights, and the greatest ones may produce brightness comparable to a 40-watt incandescent bulb. That is still not as bright as a standard outdoor spotlight, so in areas where you need powerful, direct light, double or triple up. Solar lights turn off automatically during the day since they convert light into energy to store in batteries. This energy is used to power the light at night. While solar lights require little to no maintenance, they require thorough cleaning to maintain efficacy during their lives. Solar street lights are the sustainable solution for extensive lighting, lowering carbon emissions and environmental impact while increasing community safety and satisfaction. Yes, even on cloudy days, solar lights charge. Although the battery does not charge as quickly, small efficient solar panels can still provide electricity when it is partly cloudy or overcast. In most cases, you do not need to manually tu
# Solar photovoltaic output depends on orientation, tilt, and tracking – U.S. Energy Information Administration (EIA) Source: Blog/Web URL: https://www.eia.gov/TODAYINENERGY/detail.php?id=18871 Author: Date: 2026-06-18 Financial incentives, renewable portfolio standards, cost declines, and system performance improvements have led to more customer-sited solar photovoltaic (PV) installations, especially in states such as California. Because PV panels are able to capture more solar energy when they are pointed directly at the sun, installers may configure systems to optimize output by adjusting the orientation and tilt of a system, or by using mechanisms that track the sun as it traverses the sky. Installers will generally determine the tilt of a system—or the angle between the module and the horizontal—to optimize overall or seasonal performance. Assuming that a system has tilted modules, installers will generally set the orientation—or direction—of that tilt to optimize overall or time-of-day performance. In the Northern Hemisphere, the simplest way to maximize total annual system output of a fixed-tilt system is to tilt the panels south. The tilt angle may increase with latitude: the farther away from the equator, the higher the tilt. However, while solar radiation peaks around noon, electricity demand often peaks in the afternoon or early evening. In these last few hours of daylight, west-facing PV panels have an advantage over south-facing panels, as they're tilted towards
# Solar photovoltaic output depends on orientation, tilt, and tracking – U.S. Energy Information Administration (EIA) Source: Blog/Web URL: https://www.eia.gov/todayinenergy/detail.php?id=18871 Author: Date: 2026-06-18 Financial incentives, renewable portfolio standards, cost declines, and system performance improvements have led to more customer-sited solar photovoltaic (PV) installations, especially in states such as California. Because PV panels are able to capture more solar energy when they are pointed directly at the sun, installers may configure systems to optimize output by adjusting the orientation and tilt of a system, or by using mechanisms that track the sun as it traverses the sky. Installers will generally determine the tilt of a system—or the angle between the module and the horizontal—to optimize overall or seasonal performance. Assuming that a system has tilted modules, installers will generally set the orientation—or direction—of that tilt to optimize overall or time-of-day performance. In the Northern Hemisphere, the simplest way to maximize total annual system output of a fixed-tilt system is to tilt the panels south. The tilt angle may increase with latitude: the farther away from the equator, the higher the tilt. However, while solar radiation peaks around noon, electricity demand often peaks in the afternoon or early evening. In these last few hours of daylight, west-facing PV panels have an advantage over south-facing panels, as they're tilted towards
is to simply incorporate as much unshaded south facing roof surface as possible; Figure 2 shows one such installation in which the entirety of the available roof is used for solar panels. Figure 2: Solar Panel Distribution on a Small North-Facing Lot Passive solar energy can be collected and transferred into the house by placing windows on the southern exposure of the house. However, too much exposed southern glazing can cause overheating in the summer and even in the winter. Therefore, careful sizing and placement of the windows and design of overhangs or other shading methods are needed in order for this solar energy strategy to actually reduce net energy use. For wind power or a ground source heat exchange loop, the location of the renewable equipment depends on other site features such as soil type or predominant wind direction. Thus a general layout of the renewables equipment on the site will inform the options for the placement and orientation of the house. In addition to orienting or placing the new house in a location that is compatible with provision of the renewable energy source, orientation for other energy reduction strategies appropriate for the climate region should be considered. For example, the orientation, layout and form of the house should be arranged to take advantage of daylighting, to support passive solar heating, to avoid unwanted solar heat gain, and to create unconditioned or semi-conditioned living space such as a three-season porch. 2.2.7 Princi
1. The PV used here must be exposed at an angle of about 0-30 ° to the sun and to the south to generate good power output. 2. As a result, the PV is limited to the top of a lamp and thus the area size is limited. 3. Solar lamps are usually not optimally positioned by the user to the sun, as their primary purpose is the illumination of a particular area. The PV modules are thus often in partial shade or completely absonnig. The necessary requirements according to Die in diesem Patent verwendet PV hat bei nicht optimaler Exposition einen verhältnismäßig guten Ertrag, das Problem der zufälligen Exposition einer Solarlampe wird damit gelöst. Durch die gleichzeitige Verwendung der Solarfolie als Lampenschirm und Solargenerator steht erheblich mehr Fläche zur Verfügung, was zu einem vergleichsweise deutlich hören Energieertrag führt.The PV used in this patent has a relatively good yield in non-optimal exposure, solving the problem of accidental exposure of a solar lamp. By the simultaneous use of the solar film as a lampshade and solar generator is considerably more area available, resulting in a comparatively clearly hear energy yield. Welchem technischen Problem hat sich der Anmelder gestelltWhat technical problem has the applicant faced? Eine Solarlampe soll hell und lange leuchten können. Dafür benötigt sie einen entsprechend hohen solaren Energieertrag. Die Funktion und Form einer Lampe beschränken jedoch die mögliche Größe einer integrierten PV. Durch die Wahl einer anderen P
edge around the solar panel lampshade, cover scribbles light reflecting membrane along upper surface, and light reflecting membrane can be transmitted into the sunlight that shines above it on solar panel, to reach the purpose that improves illumination indirectly; (2) the solar panel lampshade leaves osculum with the intersection on cover edge, to reach the effect of the rainwater of in time draining; (3) lower surface on street lamp lampshade and cover edge scribbles reflective material, to strengthen the intensity of illumination of street lamp; (4) adopt microcontroller, the power output and the accumulator cell charging and discharging of solar panel are monitored in real time, utilize the purpose of solar energy to reach maximal efficiency; (5) adopt polymer Li-ion battery as the electric power storage battery, this battery capacity is big, pollution-free, charge and discharge cycles often, and its shape can be changed arbitrarily; (6) fully use the solar energy natural energy resources, both reached the purpose of energy-saving and emission-reduction, environmental protection again. Description of drawings Fig. 1 is a structural representation of the present invention. 1 is that lampshade, 2 is that lighting, 4 is that battery case, 5 is lamp stand for covering edge, 3 among the figure. The specific embodiment Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated. Embodiment A kind of curved solar energy cell panel s