Solar Lights....?

I have had solar lights. They do have a battery in them. But the battery does not give the light by itself. The lights are suppose to take in the sunlight for approx 24 through 48 hours before turning them on. If you use lights on the side with out sun light you may want to use a different method of light for that side.

1. If solar prices will be dropping in the future, doesn't it make sense to not subsidize solar now?

The costs of global warming will not be dropping. They will increase faster than any decrease in technology - up until the point where demand/need for the technology will drive those costs up also

2. How can i caculate when a total solar and lunar eclipse will occur at my location?

There are many astronomical softwares which can be used to calculate Lunar &Solar eclipse. Nasa/eclipse page will give you the details of eclipse in different years. Jean Meeus has written books how to computer for astronomical calculations. Also astronomy with your computer.Both explains calculations. Free software named mooncalc is available on internet to download and can be used to find eclipses.

3. Is the "solar wind" an actual wind? ?

The solar wind if a stream of particles from the Sun. And it does not blow away the probes because it's just not strong enough!

4. solar energy question!?

haha, you would pay about 10,000 just to get that stuff, but it may be a good investment if you are not in a consistently cloudy area. Do not worry about "going green," its all a money-making scam and a fad, it will wear off eventually.

5. Amount of solar panels needed to run a/c and pool pump?

Solar panels are not going to be able to run a pool pump 24/7. They will only produce their rated electricity for 4 to 8 hours a day. For the balance you will need a grid connection or a battery backup. Running the AC would require different power levels depending upon humidity, outside temperature levels, solar gain for the house, and insulation levels. An underground house in Maine will be much easier to AC than a Glass house in Arizona. First find the power requirements. If you had the existing equipment they will have a label with the power requirements or the minimum breaker required if nothing else. For example the pool pump may require a 10 amp 240 breaker while the AC may require a 30 amp 240 breaker. That would be 2400 watts for the pump and (30 x 240) 7200 watts for the AC or a total of 9.6kW each hour of operation. (max) You will next need to find the rated capacity of the solar panels. If each panel were rated at 300 watts then you would need 32 panels for the daytime use and perhaps more to fill in a battery backup. All the numbers are very rough estimates.

6. anyone else found solar power companies that lease panels for your roof a little flaky?

I've found lots of companies everywhere of all kinds to be flaky. And you could probably have an interrupt circuit installed to your solar system, depending on the local laws where you live. Some places do not even allow them because of the risks, but that even applies to generators.

7. solar powered home is US?

You might check the website below - I did not look around, but it is a good website

8. solar panels and electrocution?

solar panels are usually 12 or 24 volts for the smaller ones, and those voltages are pretty safe. larger arrays can be connected in series or parallel, depending on the battery configuration. It's likely for a large installation to produce 48 volts or even higher, and those voltages can be dangerous. Higher voltages are used on large installations to cut down on the cost of the wiring. But, any solar array has an inverter somewhere, running off a battery, and that will output 120 or 240 VAC, and that is definitely dangerous. So this raises an interesting point. Should all solar panel installations include a cutoff switch accessible to fire fighters? It looks like they should. The switch has to cutoff the voltage from the array, and also turn off the inverter. edit: but switching off the voltage from the array is not enough, as the array is still putting out power (assuming the sun is shining). One possibility is to use a multiple pole relay located very near the array to open both and - leads from the array. Thus there is no path for the current to get to ground. If water got everything wet, the array would short across itself but still be isolated from ground. But what if the relay fails? Max, you seem to have the idea that it takes a lot of current to be dangerous. No, 20mA can shock you, 50mA can kill you, and there are a lot of arrays that can put out 48 volts at many amps. edit2: "edit: you could place a normal off switch on the solar array and hook it up to the fire alarm for industrial systems, the switch should open even when power fails. And you are correct in saying that it is the current that kills, but you still have to have enough volts to get a decent current trough a human (no mater what the max current output is). The real question is then do solar panels have a fixed current output (then its dangerous) or a fixed voltage (then with max 50 volts is even wet not a problem)" sorry, 50 volts IS a problem, lots of people have been killed from 50 volts. I admit it is not as likely as with 100 or 200 volts, but it is still possible, specially with a lot of water around. I do not remember the UL spec offhand, but I think it is somewhere around 20 volts. solar panels have a variable voltage, dependent on the amount of light on them. You have to plan on the highest possible voltage. The current output is usually in the tens of amps or higher, more than enough to kill, so it is the voltage that will determine the current through your body. edit3: dividing up the world into constant voltage sources and constant current sources is meaningless, as neither exists in real life. All voltage sources are a imperfect voltage source or an imperfect current source or something in between. .

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Best Quality 60W Solar Street Light in Pakistan
Rated 5.00 out of 5 based on 3 customer ratings Rated 5.00 out of 5 based on 3 customer ratings With growing concerns on electricity shortages and keeping in view high fares, Ultronics has introduced Solar Street Lights with 60 Watts power. This solar street light is a complete solution for people choosing to move on alternate energy solutions. This solar light is built with high quality ABS Material that stands tall under tough conditions. An ideal selection for housing societies, parks, factories, mines and open warehouses this light is IP65 certified which means it is completely water proof. Back up Time: 6-8 hours (on full mode) when charged under bright sunlight1. how can i made a circuit for solar street light?You could be using leds or a compact fluoro for this. These will be for use with a 12V battery. It may be you want to reconsider using 40W, as less power is much more feasible. About 10W of CFL or LED supply will be the same as a 40W incandescant lamp, and last much longer. If using leds you will need an efficient switch mode current regulated source to drive them. You can expect similar efficiency to a compact fluorescent lamp. The leds will need heatsinks. The size of the battery and the panel are critical parts of the design. The power supply would be a 12V battery. The light runs at night only. WIth some care the solar panel itself can be used as a sensor to switch on the lights by measuring the battery voltage. When under charge it will be around 13.85V, using a float charger. The current is inherently limited by the panel. A simple but effective charger is to connect the solar panel by a switch (P channel mosfet as a high side switch or relay) when the voltage is below 13 volts and disconnect it when the voltage approaches 14V (lead acid battery). Use a reverse blocking diode with the panel. Note that gel type batteries are not very suitable for operation in sunlight in the tropics at least. When the battery is below 12.6V consider it as night time. Otherwise use a separate sensor for sunlight. Thus you have three voltage comparators for these 3 voltages. These can be a schmidt trigger with the correct hysteresis. You need a reference supply. A small 5V regulator is simple. This uses a solar panel designed for charging a 12V battery, meaning it has 36 cells. The OC voltage at standard conditions is 22V. Look up data sheets specs for panels. If the lamp runs 12h per day, and the power is 10W, then it uses 120Wh per day. With a 12V system this is 10Ah. The battery needs to be at least 10Ah, especially considering overcast days, and the need to not discharge it below 50% of capacity. This looks like a 40Ah battery therefore. The maximum charge rate should not exceed 4A (10h rate). The solar panels must provide 10Ah per day too, but... The battery takes 140% of its discharge to recharge, so now 14Ah per day. Allow extra to catch up after a period of overcast weather, at least 20Ah per day. The rated current occurs with full sun. There is an equivalent of full sun hours for your region, likely 2-5h a day. In the tropics 5h per day. Thus we need 20Ah in 5 hours, so a current of 4A. This agrees nicely with a 40Ah battery. So for a 10W lamp operating 12h a day in the tropics we need something like a 40Ah battery, and a 4 amp x 36 cell panel. This will be rated around 15V * 4A = 60W. A bigger panel is ok within reason, but should have a bigger battery so it does not charge too quickly. A bigger battery may be needed to increase the lifetime, and allow a reasonable number of days without sun if overcast weather lasts more than a day or too. The electronics should all be designed for outdoor use, vermin proof, including rats to ants, weather-proof and able to operate at 60C ambient temperature. The link below has an example of a P channel mosfet high side switch driven by a voltage comparator. Use a 10A or more rated switch and the comparator needs a reference so it turns on at 14V and off at 13V.2. All in One Solar Street Light Manufacturer with Best Price in IndiaAll In One Solar Street Lights All In One solar street light is a new-age form of lighting solution integrating solar panels, charge controller, LED light and battery. These lights are available in two varieties, with infrared motion sensors and without, as part of the unit. All In One solar street lights are becoming popular due to their compact design and multiple other advantages. Motion sensors help to adjust the LED brightness intelligently in All In One street lights. Infrared (IR) and passive infrared (PIR) motion sensors are used for motion sensed detection of emitted/reflected infrared energy. The All In One solar street lights with motion sensor switch on in the evening and after a time delay of 30 seconds, the lights automatically reduce their brightness to 20%. Motion sensor is capable of detecting infrared waves that radiate from moving objects, thereby electronically increasing the brightness of the lights. Once motion is detected, there is 100% brightness and if there is no motion detected in the area after the time delay, the light gets automatically adjusted to a dim mode of 20%. The biggest advantage of solar street lights with motion sensors is that they add a sense of security and safety to your property while providing better battery life. Features of All In One Solar Street Lights Controllers used in All In One solar street lights PWM or MPPT charge controllers are used in All In One solar street lights. PWM controller acts as a switch between the battery and solar panel. The battery is charged with constant 3-stage charging, i.e., bulk, float and absorb. Pulse width modulation or PWM is the technique to modulate the pulse width to change the voltage and frequency of energy from solar panel to charge the battery. One of the greatest pros of PWM controllers is that it helps to prevent overcharging while charging the battery. As for the cost, PWM controllers are less expensive compared to MPPT controllers. MPPT (maximum power point) controller offers an indirect connection between the battery and the solar panel. The DC/DC converter takes extra photovoltaic voltage and transforms this into additional current at lower voltage. MPPT controllers adjust the voltage to maintain the most efficient level of power. In cooler conditions, MPPT controllers are observed to be more effective than PWM controllers due to their ability to capture extra PV voltage. Solar panels used in All In One solar street lights Though both monocrystalline and polycrystalline solar panels are used in solar street lights, polycrystalline solar panels are most commonly used in All In One solar street lights due to their cost effectiveness. Since most of the All In One solar street lights use motion sensors, they do not require solar panels with more wattage. Batteries used in All In One solar street lights Lithium ion phosphate (LiFePO4) batteries are widely used in All In One solar street lights due to their multiple advantages. LiFePO4 batteries offer upper and lower voltage protection and longer lifespan. These batteries can operate in different temperature range and are maintenance free. LiFePo4 batteries are the perfect choice for All In One solar street lights due to their relatively small and light feature. Lithium-ion as well as lead acid batteries are also used in some All In One solar street lights. Light source used in All In One solar street light LED light source is used in as it consumes less energy and gives higher luminosity. Installation of All In One solar street lights Compared to integrated solar street lights, the installation of All In One solar street lights can be carried out easily. The All In One solar street light can be effortlessly mounted due to its compact size and also due to the fact that there are no wires or cables to connect. They can be installed either on a pole or on a wall. The pole should be fixed to a flat ground without inclination. The light fixture should be installed to the pole before erecting the pole. The pole should go at least 3 feet deep inside the ground. The basic cage must be secured to the ground using concrete. It is essential to place the poles at even widths to provide uniform brightness to the entire area. The poles must be placed in the right position and angle so that the panels get sufficient direct sunlight throughout the day. Since All In One solar street lights have dusk to dawn feature, they need very minimal maintenance once installed. Rain water washes away most of the dust and dirt off the solar panels; however, routine cleaning of the panels helps the efficiency of All In One solar street lights. The solar panels can be cleaned by wiping them with a soft cloth or spraying water with a jet spray. Occasionally, you may inspect the installation bracket and the mounting arm to look for any damage. The All In One solar street lights are automatic in its function. They are operated with infrared motion sensor which helps to detect movement in its field and illuminate the lights, thereby ensuring security. Also, the controller can be set to operate in a timer-based manner where in the lights operate in full brightness for the first four hours and then later, in lower light for rest of the time. With the motion sensor and dimming options, the All In One solar street lights tend to save energy, thereby guaranteeing longer life to the lighting fixture. No cable work or electric equipment is needed, so the installation/construction cost is lesser. No need of manual intervention after installation, so the management cost is lesser. The lights are powered solely by using solar energy and no conventional energy is used, so the operation cost is lesser. Installation is easier and faster and maintenance is very minimal. Compared to integrated solar street lights, All In One street lights are less expensive. Since All In One solar street light requires direct sunlight to give its full potential at night, it may not be able to meet requirement of the areas with insufficient sunlight. Since having shadows may obstruct the sunlight to fall onto the solar panels to charge them efficiently, installation sites may be limited. Initial investment to purchase All In One solar street light is high compared to traditional lighting system. However, the benefit of advantages is far beyond the shortcomings of disadvantages. With the technological advancement, All In One solar street lights will be more and more used in the coming future.3. Recycling light from solar street lights.?No,the theroy for solar street light work in night is get the electrcity from the battery,the power in batter can last 1-2 days
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