Q:cheapest price for a 20 watt solar panel sold on line

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Q:What is the most powerful solar panel made?

There are various solar farms that run turbine generators that have some rather large arrays. I suspect they'd be in the southwest but i've seen pictures of them covering a few acres. You won't find very large panels because its best to keep the panels small and just have a lot of them. This is because its much easier to have a thousand 0m^3 panels then huge 0000m^3 panel because you achieve best performance when you can align the solar panels to always face the sun. With a huge panel, you would need it to be high off the ground so it can manuver around. Small ones can all be menuvered on a small scale only a few feet off the ground so they can all be pointing towards the sun to gather the most light.

Q:Can solar panels be used on boats or marine applications?

Yes, solar panels can be used on boats or marine applications. In fact, they are becoming increasingly popular for providing renewable energy on board boats, yachts, and other marine vessels. Solar panels can generate electricity to power various onboard systems, including navigation equipment, lighting, refrigeration, and charging batteries. They are a sustainable and efficient way to harness solar energy while minimizing reliance on traditional fuel sources.

Q:Could anybody give some review about Homemade Solar Panel.

If you want to make hot water then they are easy to make. Search the web.

Q:I want to install solar panels in my roof and most installers don't recommend any particular brand. Do you have experience with any particular brand that has worked for you or anybody you know? Does the brand of the panel make a difference?

I didn't research this. I do know that you must install them on the side or area of the roof that receives the most Sun all day. You can get information at stores like Lowes or HomeDepot.

Q:So I want to go completely solar. Do I need the connected solar panels alone for after sundown hours; Do I need something else in order to have energy to run my entire house throughout the night?In other words do solar panels store the energy for after sun-down or do I need other devices to store the energy?

solar panels don't store energy, they only generate it. If you want to store energy you need a battery bank of some kind to get you through the night and anytime the sun isn't shining. If you have a little extra in the budget you might look at a geothermal system for your home's heating and cooling needs. They're highly efficient systems and you can supplement however you like. Whatever you do, though I hope you have a good building envelope in place already. Solar panels are cool, but if you have a leaky house, you're still not getting the best out of your panels. Do the more mundane stuff first. Insulation, windows, and weather-tight doors.

Q:can solar panels have glass between the panels and the sun?

PV panels do not have to be in direct sunlight. If they are behind glass they need to be well ventilated to remove excess heat. If PV cells connected in series are not uniformly illuminated the series will produce an amount of power that is based on the light on the least illuminated cell. Thus moving a panel back from a window will mean that for large parts of the day it will produce almost no power as parts of the panel are shaded. This applies only when the cells are connected in series. In parallel they suffer no special degradation of production, but just the sum of illuminated cells. This makes a difference when you decide to use a higher voltage panel... high voltage panels are more susceptible to partial shading. But connecting low voltage panels in series gives that same degradation. Stay away from placing a panel back away from the window, or close to the edges of the window, under roof overhangs, trees and surrounding building shade, where possible.

Q:Do solar panels require permits for installation?

Yes, solar panels generally require permits for installation. The specific requirements and regulations for obtaining permits may vary depending on the location and local building codes. However, in most cases, permits are necessary to ensure compliance with safety standards, electrical codes, and zoning regulations. It is advisable to consult with local authorities or a professional solar installer to determine the exact permitting process in a specific area.

Q:Can solar panels work in cloudy weather?

Yes, solar panels can still work in cloudy weather, although their energy production may be reduced. Cloud cover reduces the amount of sunlight reaching the panels, resulting in a lower output. However, modern solar panels are designed to generate electricity even in low-light conditions, making them still effective in producing energy during cloudy days.

Q:For those solar panels that you install on your rooftops, do they generate electricity when it's cloudy? And if yes, how much electricity does it generate compared to sunny days? For example...like only 25% electricity generated compared to sunny days?

From my understanding they generate electricity when the suns out and when its out and there aren't too many clouds around covering up. They store some electricity for the winter and cloudier times but I'm not really an expert!