Category: Solar 101

How Efficient Are Solar Panels?

Are Your Solar Panels Fading? Here’s What You Can Do

How Much Energy Can a Solar Panel Generate?

The short answer is it depends. You see, there are a couple of factors that dictate just how much power you can squeeze out of a solar panel.

 

To find out, just ask yourself five simple questions:

 

Question #1: What is the solar panel’s wattage?

 

Most commercially available solar panels are designed to produce anywhere between 250 and 400 watts of power. The higher the wattage, the more power it can generate.

 

Question #2: What type of solar cell does the panel use?

 

When it comes to silicon solar panels, for example, there are two primary solar cell types to choose from: monocrystalline and polycrystalline. The former typically generates more power than the latter.

 

Regardless of the type you go with, though, silicon solar panels are still the most popular option right now because they strike the perfect balance between cost, efficiency, and lifespan.

 

Question #3: How many cells does the panel have

 

Solar panels typically come with either 60 or 72 cells, and the more cells a panel has, the more power it can generate.

 

This, however, doesn’t mean you should automatically go with 72-cell panels. Your choice would ultimately depend on how much roof space you have because 72-cell panels are bigger than 60-cell ones.

 

Question #4: How much sunlight do you get in your area?

 

More sunlight means more power generated. This is why you can see significant differences in the total power output of the exact same solar panels from one area to the next.

 

A 370W panel, for example, would generate anywhere between 2.2 and 2.7 kWh per day in sunny areas such as California and Arizona but just around 0.93 to 1.5 in places such as Alaska and New Jersey.

 

But even if you live in a place that gets a lot of sunlight, if your panels are covered by things like the shade of a tree or dust and debris, then you would still see a lower overall power output.

 

Question #5: How old is the solar panel?

 

Most modern solar panels are designed to work at 100% capacity for about 25 to 30 years—unless they are poorly maintained or damaged.

 

But even past their “expiry” date, they should still function at about 85% capacity, which should still provide you with sizable energy cost savings.

 

What does all this mean?

 

Choosing the right solar panels for your home is not as straightforward as you might think. There are a lot of factors to consider to ensure your solar power system is able to generate enough power for your needs.

 

So, how about we make the process a little simpler? Just book a no-obligation free consultation with one of our solar panel consultants and we’ll help you find (and install) the perfect solar power system for your home.

 

Can I Use Solar Panels to Completely Power My Home?

The short answer is yes, you can use solar panels to completely power your home. The setup required, however, would ultimately depend on four main factors:

 

#1: Your total energy consumption

 

To be able to power your entire home using only solar energy, you will need to first find out how much power your household consumes—which you can easily do by checking your electric bill—so you know how much power you need.

 

To give you an idea, the average American household consumes around 893 kWH of energy per month, but depending on the size of your property and family, your actual consumption may be higher or lower than that.

 

#2: The wattage of the solar panels you get

 

Different solar panels have different power and efficiency ratings. The higher the wattage of the ones you get, the fewer of them you need.

 

This means that if you don’t have a lot of space on your roof, then you’d have no choice but to invest in higher-wattage, higher-efficiency panels so you can use fewer panels to generate the amount of power you need.

 

In contrast, if you have ample roof space, then you can get away with using lower-wattage, lower-efficiency panels by simply installing more of them.

 

#3: The amount of sun you get in your area

 

The actual performance of your solar power system would ultimately depend on the amount of sun available in your area.

 

As a general rule, people who live in a sunny state can get  more power out of their solar panels than those who live in an area that does not get a lot of sun.

 

What does all this mean?

 

As you can see, while powering your entire home exclusively using solar energy is indeed possible, doing so is not as straightforward as it sounds. In fact, it’s quite easy to get wrong if you don’t know what you’re doing.

 

And even if you manage to get the math right and figure out the exact setup you need, you’ll still need to be able to install everything perfectly to ensure everything works as intended—which is where our team here at LGCY Power comes in.

 

Instead of trying to figure everything out yourself, you can just book a no-obligation free consultation with one of our solar panel consultants so we can guide you every step of the way and make sure everything is in order before you make the investment.

 

How Much Do Solar Panels Cost?

Back in the day, going solar required a massive upfront investment, which made it only accessible to wealthy households.

 

These days, however, pretty much everyone can enjoy the energy savings and many other benefits of making the switch, thanks to the significantly lower cost of acquisition and the availability of different payment plans.

 

But before we get to that, let’s first take a look at how much solar panels cost today—at least on paper:

 

How much do solar panels cost: the short answer

 

If you just want the national average, solar panels cost anywhere between $9,255 and $28,000.

 

But why the massive range? Well, that’s because there are several factors that dictate how much you need to shell out to install solar panels on your roof, including:

 

  • Your power requirements
  • Where you live
  • The availability of federal government incentives such as solar tax credits
  • The deals offered by solar companies in your area
  • The type of solar panels you decide to use

 

Let’s take a closer look at the last item on the list:

 

Type 1: Monocrystalline solar panels

 

Let’s start with the most expensive option. Monocrystalline solar panels typically cost anywhere between $1 and $1.50 per watt. This means that a 10 kW system would cost you anywhere between $10,000 and $15,000.

 

But don’t let the price tag turn you off. There’s a reason—two to be exact—monocrystalline panels are quite expensive: they’re more efficient and durable than other alternatives.

 

Simply put, when you invest in a monocrystalline system, you’ll not only need fewer panels to generate the power you need, you’ll also be able to save money on electricity for a longer time.

 

But what if monocrystalline panels are really out of your budget? Well, this is where the second option comes in:

 

Type 2: Polycrystalline solar panels

 

While slightly less durable and efficient than their monocrystalline counterpart, polycrystalline solar panels are also more affordable, coming in at just $0.70 to $1 per watt. This means a 10kW setup would cost you anywhere between $7,000 and $10,000.

 

Type 3: PERC solar panels                         

                                        

Now, if you want something that’s cheaper per watt than polycrystalline panels but more efficient than monocrystalline ones, then PERC solar panels may be the best option for you.

 

Short for “passivated emitter rear cell”, PERC panels cost just $0.32 to $0.65 per watt and are designed to absorb more sunlight than both monocrystalline and polycrystalline panels.

 

But that’s not all. They’re also designed to handle extreme heat better. Behind the main cell of a PERC panel, you’ll find another layer that prevents excess sunlight from heating up its back sheet, which, in turn, keeps the system operating at peak capacity.

 

But the excess sunlight doesn’t go to waste either. It gets reflected back to the panel’s main cell, increasing the total amount of solar energy the system absorbs.

 

Type 4: Thin-film solar panels

 

The actual per-watt cost of thin-film solar panels ultimately depends on the type you get.

 

Copper indium gallium selenide (CIGS) panels cost $0.60 to $0.70 per watt. Cadmium telluride (CdTe) ones cost $0.50 to $0.60. Finally, Amorphous silicon (a-Si) panels cost anywhere between $0.43 and $0.50.

 

Despite their significantly lower price tag, however, they’re also the least efficient option out of the four—and they’re bigger too. This means you’ll not only need more panels to meet your energy requirements, you’ll also need a massive roof to house all of them.

 

This is why this particular type of solar panel is used more for industrial applications than residential ones.

 

But what about the other factors?

 

Aside from the per-watt cost of the type of solar panel you decide to go with, you also need to consider how many panels you’ll need to generate the power you require—and then subtract any applicable tax credits and rebates to the total cost.

 

In addition to the cost of acquiring the system, however, you’ll also need to take into account the cost of labor, which goes up or down depending on two primary factors:

 

  1. How difficult it is to install and set up the solar energy system you chose
  2. How much renovation work your home needs to accommodate your chosen system

 

This is why it’s important to check whether your home qualifies for a solar upgrade first before doing everything else.

 

As a general rule, you need to have a south-facing roof that’s not in the shade of nearby structures or trees and has a slope between 15 and 40 degrees to ensure your solar panels get the most sunlight throughout the day.

 

In addition, your roof also needs to be big and sturdy enough to accommodate the number of panels you need to meet your power requirements.

 

But don’t worry. You don’t have to do the checking yourself. In fact, it’s better to just have a solar specialist do it for you to ensure everything is in order before you proceed. This way, you can avoid costly issues and redos down the line.

 

Is there a way to bring down the upfront cost of solar panels?

 

Absolutely! You have three options: solar loans, solar lease, and solar PPA. Let’s take a closer look at each one:

 

A solar loan works pretty much like any other type of loan: it allows you to acquire your solar energy system via a payment plan. The only difference is that with solar companies such as LGCY Power, it also gives you access to the following benefits:

 

  • Monthly payments lower than your energy bill
  • System maintenance
  • Product and workmanship warranty
  • Federal solar tax credit and other government incentives

 

Just like a solar loan, a solar lease also eliminates the upfront cost of going solar. The only difference is that you don’t get to own the system. In fact, if you get one from LGCY Power, you’ll also get access to the exact same benefits as with a solar loan.

 

Finally, a solar PPA—short for power purchase agreement—also completely takes upfront costs out of the equation, but instead of requiring you to pay monthly to own or rent the system, you’ll only pay for the amount of power you generate.

 

The benefits you get, if you decide to work with LGCY Power, are also exactly the same.

 

But is solar worth the investment?

 

Of course, even if it’s now easier than ever on the budget to make the switch to solar, the question is: is it actually worth doing?

 

Well, let’s first take a quick look at its benefits so you can decide for yourself:

 

First, as we’ve seen earlier, going solar gives you access to different government incentives. Depending on the state you live in, this can include things such as tax credits and rebates.

 

Second, in some states, energy companies are also required to either pay you with cash or credit for any excess power your solar energy system generates. In this setup, you’re essentially making money by selling energy back to the grid.

 

Third, aside from the energy savings, fitting your home with a solar energy system also bumps up its value. Depending on where you live, this could translate to an extra several thousand dollars on top of your home’s current price tag.

 

And finally, on top of all the financial incentives, going solar also gives you and your family access to several non-monetary benefits, including:

 

  • A steady supply of clean water
  • Cleaner air
  • A more stable economy

 

Let’s take a closer look at each one:

 

First, with more households using solar energy, the need for hydroelectric power plants—which use massive amounts of water—would naturally decrease. This, in turn, means more readily available clean water for everyone.

 

Second, going solar also minimizes our need to rely on fossil fuels for our energy needs. The result? Cleaner air for everyone, thanks to less harmful fumes and excess carbon dioxide being released into the atmosphere.

 

Finally, as you probably already know, the price of oil in the global market is extremely volatile. There are just too many economic and political factors that can cause it to suddenly skyrocket.

 

With fewer households relying on fossil fuels, the need for our country to pay other countries to import them also decreases, resulting in improved economic security for everyone.

 

So, now that you’ve seen all the benefits of making the switch to solar, it seems like a pretty good investment, right?

 

Your next steps

 

If you wish to know more about fitting your home with a solar energy system, just book a no-obligation free consultation with one of our solar panel consultants. We’ll be happy to answer all your questions and guide you every step of the way in case you decide to proceed with the upgrade.

 

Rooftop Solar Panels — How Do They Work?

What are rooftop solar panels?

A rooftop solar panel is a grid that acts as a “collector” of the sun’s radiant energy, converting it to usable energy that is then stored in batteries and later used to power our homes. The solar cells within the grid are also called photovoltaic cells and are responsible for collecting radiant energy. The panels (modules) are grouped into “arrays” and placed in large outdoor spaces or rooftops. The number of PV cells needed for an array depends on the size of the module, i.e., a 12V module has 36 PV cells, while a 24V module has 72 PV cells.

Solar technology uses crystalline silicon as its semiconducting material. In residential rooftop solar panels, this material is monocrystalline or polycrystalline silicon. The silicon’s purity determines the efficiency of a solar panel. Monocrystalline is purer than polycrystalline silicon, so it generates more power with less space. There are other types of modules available, most of them not suitable for home installation.

How do rooftop solar panels work?

The sun can be compared to a natural nuclear reactor. It is constantly releasing tiny particles of electromagnetic radiation (EMR) energy called photons. Rooftop solar panels collect the photons within the PV cells, converting the EMR into usable electricity. Solar energy is converted to direct current (DC), which is ultimately converted to alternating current (AC) that we use for power.

In this article, we discuss the lighter side of science on how rooftop solar panels work.

PV Cells—turning photons into electrons

As mentioned earlier, PV cells convert energy from the sun into electrical energy. Solar cells are constructed from semiconducting materials, most often silicon (Si), one of the most plentiful materials in the world. During this photovoltaic process, photons are turned into electrons.

One of the most significant benefits of this conversion process is that it does not generate any harmful emissions or waste, thus maintaining a clean, green environment while being extremely effective at generating energy. Photovoltaic cells (solar cells) are semiconductor devices that produce DC electricity when light falls on them.

Rooftop Solar panels—generating current

We discussed how PV cells convert photons into a direct current (DC). Each solar cell is made from crystalline silicon “sandwiched” between a negative and positive conductive layer. The positive layer has extra space, while the negative layer has excess electrons. Keep in mind that electrons move from negative to positive. Electrons travel across the confluence of the two layers, leaving a negative charge on one side and a positive charge on the other.

Because each cell produces about .5V, modules are constructed using several PV cells to generate enough electricity to power a house. It takes 12 PV cells to charge your cell phone—powering a home takes several modules.

If they could utilize an expanded range of convertible wavelengths, rooftop solar panels would generate more energy. Silicon, the semiconductor used in photovoltaic cells, does exceptionally well converting some of light’s wavelengths into electricity. The range of wavelengths a semiconductor can convert depends entirely upon the electrical properties of the material. If these materials absorb wavelengths packing more energy than those in the specific range of the material, the excess energy is lost as heat. Advancement in solar power technology is focused on increasing silicon solar cell efficiency by developing materials that can capture a broader range of wavelengths.

Inverters—DC to AC

Rooftop solar panels are incapable of powering a home—they need an inverter to convert the currents into usable electricity. The panels generate direct current (DC). Most houses in the US are wired for AC power. Therefore, an inverter is used to transform the DC into an alternating current (AC). A small, minuscule amount of energy may be lost in this conversion.

Most solar energy systems have a single inverter for the entire home. Another option is to connect microinverters to each panel. Either way, the result is the same.

Electricity is now available

AC electricity flows from the inverter to an external circuit and through your home. The solar-generated electricity then flows to all your home’s appliances, computers, TVs just as it would if you were receiving it from the power company. Rooftop solar panels may produce more power than your family needs. In that case, it can be stored in specialized batteries or sold back to the power company. Depending on how you get set up with the local power company, if your batteries are running low, you may be able to return to the power grid for the short term, for which you may receive a bill. Every power company has different programs for excess power buy-back and requirements for returning to the grid.

Excess energy—should you sell it or store it?

Suppose your rooftop solar panels generate excess energy. In that case, you have the option of either storing it in solar batteries or selling it through a net metering program back to the local utility company. By keeping the excess energy in solar batteries, your system remains off the grid. Batteries also provide you access to power 24/7, even on cloudy days when your rooftop solar panels don’t generate electricity quite as efficiently.

If you decide to use net metering, the utility company will pay you for the power you sell them. Depending on how the local utility company’s program is structured, they may apply for the compensation as bill credits, which can help offset any electricity you may use if you access the grid, helping you save money. Utility companies won’t pay cash for supplying power into the grid.

What is the lifespan of rooftop solar panels?

Rooftop solar panels can last up to 25 years or more—they are surprisingly durable and require little to no maintenance. There are no mechanical or electronic parts, so there is no wear and tear, and nothing gets worn down.

Solar panel manufacturers forecast a degradation rate of about 0.8% per year. After 20 years, solar energy production should only drop to an estimated 84% of the efficiency standard.

Residential panels typically come with performance warranties of 10-25 years. Depending on where your home is located, your system may outlive its warranty. Some rooftop solar panels continue to function for 40 years at a relatively high rate of efficiency. Panels can withstand 140 miles per hour wind speeds, according to Energy Sage. Most homeowners’ insurance policies cover solar panels against damages.

What is the lifespan of solar batteries?

Solar batteries and PV inverters don’t last as long as solar panels. Typically, solar PV inverters last between 10-15 years; the possibility of replacing them both within your system’s lifespan is very likely. A quality solar battery can be expected to last 8-15 years.

Inverter and battery inverter performance can be expected to decline over time. When comparing the different types of rooftop solar energy systems, be sure to read the warranty and performance guarantee.

Will solar power save me money?

Yes. Most Americans who have installed solar panels save on their electric bills. To better understand if solar panels will save you money, once you calculate or get a quote for the system, figure out your breakeven period:

  • How much do you spend annually on electricity?
  • How much will the system cost?
  • Divide the total cost by the total of your electric bills.

The resulting number is the number of years it will take for the new system to pay for itself.

Do rooftop solar panels work at night?

Solar cells require sunlight to produce electricity. However, excess energy can be stored in batteries so that your system can still provide power at night. Additionally, you can still source power from the grid if your rooftop solar panels aren’t producing enough power to meet your electricity needs.

What kind of current do rooftop solar panels produce?

Rooftop solar panels produce direct current (DC) electricity when photons from the sun knock loose electrons in the silicon PV cell. Each solar cell has a positive and negative layer, thus creating a DC electrical field. Since most homes are wired for AC, an inverter is needed to convert the DC into usable AC power.

Can you build your rooftop solar panels?

No, the technology and manufacturing process is too complicated. Most people can’t build their rooftop solar panels.

Bottom line

The solar energy market is evolving rapidly, changing to stay abreast of the growing demands for renewable energy. Installing a rooftop solar energy system in your home is a sustainable way to decrease your energy costs and carbon footprint.

Solar energy is not the right choice for everyone. Read about solar panel costs; compare the pros and cons of rooftop solar installation to see if it’s right for you.

If you are a homeowner in Arizona interested in installing rooftop solar panels, give us a call today for a free quote!

Hot, Hot, Heat: How to Install Solar Panels

As solar power becomes more affordable and accessible throughout the U.S., more and more residents are making the switch. Not only can this investment save you money in the long run, but it’s also going to make a positive impact on the environment for years to come.

But how can you go about obtaining a building permit for solar panel installation? Is the process the same everywhere, or does it vary?

We have all the information to help you through the process. Read on to learn everything you need to know.

Do You Need a Building Permit for Solar Panel Installation?

So the question is, do you need a building permit for solar? In short, the answer is yes. What gets complicated is learning the local, state, and federal laws that you have to abide by in order to obtain that permit.

This isn’t much different than any other additions to your home, though, so the process shouldn’t be too daunting.

What Happens if You Don’t Have a Building Permit?

Failure to obtain any and all the required permits for your project can result in fines. You may even be called to take your solar panels down, putting you right back where you were before you started.

Take your time from the beginning to ensure everything is being done properly. From there, it’s easy to follow the process so nothing is held up along the way.

Permit Requirements

The biggest thing you’re going to need to remember is that permit requirements change throughout the years. If this isn’t your first time having solar panels installed, you’re going to have to research laws and bring yourself up-to-date before getting started.

You’re also likely to need an inspection from a local electrician to ensure that you’re meeting the proper codes, and you might have to clear it with your electricity company as well.

It’s also important to ensure you have approval from your homeowner’s insurance company. They might have certain regulations for homeowners to follow. If you fail to meet your insurance company’s requirements, it can result in your policy being voided.

How You Can Ensure Your Solar Panels Are Properly Licensed

To ensure that your solar panels are properly licensed and insured, it’s best to call in a local professional. They’re going to know the local laws, and they’re also going to be able to walk you through the entire process.

In some cases, you’re going to need a license to even purchase the materials you need to install solar panels. When you’re hiring or consulting with a professional, make sure you ask to see their professional certifications.

These are going to look different for each state and even city, but the premise remains the same: permits are the number one thing you need before you start construction or installation of your solar panels.

How Do You Know You’re Working With the Right Company?

No matter what area you live in, working with an experienced installer is the best way to ensure not only your own safety but also the safety of everyone in your home. Here are a few signs that you’ve picked the right installer:

  • Transparency
  • Communicative
  • Knowledgeable
  • Includes you every step of the way

The right installer is going to be transparent about their process and work to include you every step of the way. Not only will they communicate with you in a timely manner, but they’ll work to keep you updated on everything as it’s happening.

They’ll know what they’re doing, and you’ll know you can trust them with your home.

Can This Be a DIY Project?

If you’re not properly qualified, installing solar panels yourself can be a dangerous task to take on. Not only can you hurt yourself, but it can lead to serious damage to your home.

Not only could you fall and hurt yourself, but panels also present the same risk. When either happens, it has the potential to damage not only you and the equipment but also anybody on the ground and your roof or home.

Shingles can be knocked off, rain gutters can get displaced, or you could break one of the panels, which are all costly repairs in themselves.

It’s best to trust a professional with the job. It might seem like you’re spending a lot of money on something you could “just do yourself,” but you’re actually going to be saving it.

When you hire a trusted professional, they’re going to be licensed and insured, and so is your product. If something happens to either one of them on your property, then it’s all going to be taken care of.

You’re also giving yourself peace of mind. When you hire a professional, you know everything is going to be done correctly the first time around. You won’t have to worry about repairs or mistakes being made.

In the event they are made, your warranty is going to ensure they’re fixed. If any damage is done to your home, it’s going to cover that as well.

Go With the Best in the Industry

Now that you’ve learned everything you need to know about obtaining a building permit for solar panel installation, it’s time to get started. When you embark on the journey of adding solar panels to your home, it’s important to have a team of professionals behind you the entire way.

That’s where LGCY Power comes in. Not only do our services come with a 25-year warranty, but our team of professionals is knowledgeable enough to help you from beginning to end.

Schedule a consultation today to get started.

The Best Solar Panels for a Rooftop