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Solar Learning Center > Solar Panels for Home
Solar Panels for Home
So you understand the great benefits of solar – but how does the technology actually work? Check out this next section of our starter guide for choosing solar panels for your home.
How Home Solar Works:
- Your solar panels convert sunlight to DC electricity.
- Your inverter converts DC electricity to AC.
- Electricity is used to power your home.
- Extra electricity is sent to the utility grid for a credit, or to your battery if you have one.
From our blog:
- How Do Solar Panels Work?
- Will Solar Panels Keep Working If The Power Goes Out?
- Do Solar Panels Work At Night?
What are the key aspects of solar for my home?
The basics of home solar are pretty simple. There’s just a few things you need to be familiar with to understand how to set up a proper system.
Net Energy Metering and Solar
Net Energy Metering (NEM) is the policy that allows you to push and pull energy to and from the grid through your electrical meter. Traditional utility users pull energy from the main grid, use the energy in their home, and the meter counts how much is used. With solar, you will push your excess energy into the grid during the day and pull it out at night to use for lights, TV, A/Cm or anything else you may need.
Grid Tied Solar
After you put solar panels on your home, you will still be connected to the grid. This is so you can take advantage of NEM to maximize the value of your system. Essentially the grid functions as a bank storing your energy from your solar panels until you are ready to use it. With a battery backup system and secure power supply, you can use the energy from your system when the grid goes down.
Net Energy Metering Credits
If you don’t use all the energy your system produces in a day, that energy will roll over to the next day and so on. This happens day after day, month after month. This allows you to use all the energy you produce with your solar system. If you have higher usage months (AC, guests, holidays, etc) you draw from the extra energy credits you earned earlier in the year.
Solar True-Up
Once a year you “true up” with your utility where you settle the balance on your energy credit. If you consume more than you produce then you’ll pay the utility for the excess energy you pulled from the grid. If you produce more energy than you consume, the utility will compensate you for your excess energy at a below-retail rate.
From our blog:
What are the key pieces of equipment for home solar panels?
Here are the most important equipment components to the standard solar panel system for your home.
Solar Panels
Solar panels are modular pieces, usually rectangular in shape – approximately 3’ by 5’ long — primarily made of silicon, aluminum, and glass.
They vary in size, electrical output (measured in Watts), efficiency, and even color (most solar panels have either a black or silver metallic frame, and the cells will usually appear a dark blue or black in the light.)
Solar panels can be mounted to a home or building’s roof structure, or installed on a ground-mount racking structure like the standalone SmartFlower. The panels contain silicon cells that when exposed to sunlight, create a flow of direct current electricity or DC. Check out our full-length guide on how to find the best solar panels for your home.
Keep in mind: When thinking about where to locate solar panels for a home, it’s important to consider factors that will affect the system’s energy production (measured in kWh). In the Northern Hemisphere, facing south is typically ideal.
From our blog:
- How Much Energy Does a Solar Panel Produce?
- How Long Do Solar Panels Last? A Detailed Review
- Monocrystalline Solar Panels vs Polycrystalline Solar Panels
Solar Inverter
When you put solar panels on your home, you’ll also need inverters.
Inverters converts (inverts, technically) the direct current electricity produced by the solar array(s) into usable alternating current, or AC electricity.
There are several different types of inverters a solar installation might employ. String inverters are the simplest, most mature inverter technology, in which the DC from groups of solar panels linked in series are fed into the inverter. The inverter puts out AC electricity which is then fed to the home’s electrical infrastructure.
Micro-inverters are small, modular inverters that are furnished behind each solar panel in an array (1:1) and effectively compartmentalize the AC energy production of each panel so that the reduced production of one panel does not affect the output of the entire system.
Keep in mind: Some inverter companies such as SolarEdge offer power optimizers, which essentially act like micro-inverters on a string-array.
From our blog:
- Micro Inverter vs. String Inverter – Which is Right For Your System?
- Best Solar Panels and Inverters Brands of 2022
Solar Monitoring System
It’s important that every residential solar system has a monitoring system. This is the system that will allow you to view and measure real-time and historical energy production data of each solar panel on your home.
Some monitoring systems display this energy production data via a physical display unit, while others employ an online interface, or both. As “smart” or connected homes become more prevalent, solar installers can provide whole-house energy consumption monitoring as well.
In order to ensure your solar system is producing energy normally, it’s important to make sure your solar panels are paired with an energy production monitoring system.
Keep in mind: Solar.com will audit your monitoring system FREE of charge to ensure your solar array is producing what it should.
From our blog:
Solar Mounting and Racking System
A racking system is the structure on which your solar panels will be mounted to your home’s roof structure or on to the ground. While some racking systems may vary in their look, they exhibit similarities in their form and function.
It’s important to make sure your racking system, if roof-mounted, is properly flashed and sealed to ensure your roof is well-protected against the elements. Roof racking systems vary slightly depending on the type of roof.
Keep in mind: On flat roofs, a ballasted racking system can be used which requires no roof penetrations.
From our blog:
- Solar Panels on a Flat Roof: 5 Things to Know
- What Is the Best Roof Design for Solar Panels?
- The Best Roof Materials for Solar Panels: 5 Common Materials
What are the important aspects of planning my solar project?
Now that you understand the key factors for solar pricing and equipment, it’s time to share the important aspects to planning your solar project.
This includes:
- Choosing the right installation company
- Reviewing the solar contract and warranties
- Understanding the process of solar installation
- Making sure you properly maintain your system once it is fully installed
Solar Installation Company
When considering your installation company, it is important to know their number of installations, their locations, their bankability, their online reviews , and most importantly, our internal rankings.
You will also want to strongly consider the length of their workmanship warranty. Workmanship warranties cover roofing penetrations, water damage, electrical work, and anything related to their installation for the time period described.
You’ll also want to get references and testimonials from their past customers. Solar.com provides this information and more for every installer in our network.
From our blog:
Solar Installation Contract
Contracts can often be overwhelming and packed with a lot of legalese.
There are a few key areas of the contract that you should confirm are accurate:
- Progress payments (how much you pay and when)
- Any additional line items (service upgrades, EV chargers, buried lines)
- Detailed warranty information
- Cancellation clause
- System’s first year production estimate
- Hardware specifications
Taking a few minutes to review these items can enure a successful installation of solar panels on your home.
From our blog:
- What to Expect from a Solar Contract
- What To Ask A Solar Installer Before Signing On The Dotted Line
Solar Warranty
A professional, licensed solar installation company will provide an installation or workmanship warranty in addition to the warranties provided by the equipment they install (panels, inverter(s), optimizers, monitoring, racking system, etc).
As for the equipment, most solar panels come with a performance warranty lasting 25 years. The performance warranty guarantees that a panel’s output capacity will not drop by more than 0.7% per year, or less than 20% over 25 years.
This means that your system is warrantied to be at least 80% as productive 25 years after it is installed. This degradation rate can range from about 0.4% per year for modules from companies like SunPower, to about 0.9% per year for others, but 0.7% per year is the industry standard.
From our blog:
- Solar.com’s TriGuard Gaurantee – Three Levels of Protection for Home Solar
- Solar Panel Warranty Guide: What You Need to Know
Solar Installation Process
The actual installation of a solar panels on your home typically takes only a day or two. First, the materials are brought to your house as the crew of 3-5 workers arrive.
Next, standoffs are installed on the roof, then flashings. Rails are then installed and the solar panels are attached to the rails, conduit is run for the wiring, and the system is then tied-into the main service panel. City inspection is then scheduled by your solar installer.
After your city approves the system, the installation company then applies for permission to operate from the utility, which can take 1 – 4 weeks depending on the utility and volume of applications. The installation company will then switch on the PV system, set-up the monitoring system, and then you are good to go!
From our blog:
- When Is the Best Time to Buy Solar Panels?
- Three Things to Avoid When Installing Your Solar Panel System
Solar Panel Maintenance
Solar PV systems require almost zero maintenance. The rain should be sufficient to clear off the dust and dirt on your panels, but you could do no harm by hosing of your panels every 2-3 months at the most.
In areas that receive snowfall, snow shouldn’t be a major problem. Panels will still receive sunlight through the snow and heat up, causing the snow to slide right off.
When purchasing solar panels for your home, maintenance is on the homeowner. Your workmanship warranty will cover labor to service or replace any hardware if it cannot be fixed remotely. Studies have shown that this is unnecessary for most tilted arrays. Be wary of these ‘maintenance packages’ as they are often overpriced.
From our blog:
The sooner solar panels go one your home, the sooner you save!
Solar panels are a means of creating clean, cheap energy and saving tens of thousands in energy costs over the life of the system. But that savings can’t start until the solar panels are on your home.
Start your project with multiple quotes from vetted installers.
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You’ve heard of SunPower, LG, SolarWorld, Q CELLS, and maybe even Canadian Solar, but which one is the right fit for your home? To figure...
Microinverter vs String Inverter: Which is Right For Your Solar System?
A common decision you’ll have to make when designing your custom solar system is whether to use microinverters or string inverters. The basic function of...
How Do Solar Panels Produce Electricity?
Solar panels contain cells of semiconductive material, usually, silicon usually encased in a metallic frame and tempered glass. When subject to sunlight, photovoltaic cells create...
What is a Power Optimizer?
When deciding on solar equipment it’s important to know what options are available. Different equipment suits different situations better. A power optimizer is ideal...
Solar Panels on a Flat Roof: 5 Things to Know
Can you install solar panels on a flat roof? Yes, you can successfully install solar panels on the flat roof of your home or business....
Solar.Com RFP - Conejo Valley Group Buy Program
Solar.com is launching another solar Group Buy Program in specific targeted markets in order to aggregate latent demand for residential solar power systems and provide...
Driving on Sunshine: Comparing the Economics of Gas and Electric Vehicles
Driving an electric car charged by solar panels on your roof sounds like the dream – you are now driving to work in a vehicle...
Tesla's Solar Roof Rivals
Elon Musk once again shook up the energy industry with the unveiling of solar roofs by Tesla and SolarCity on October 28th. Building Integrated Photovoltaics...
What Trump's Presidency Means for the Solar Industry
The election of Donald Trump to the office of President of the United States is expected to have a profound impact on the future of...
Will Tesla Shake up Solar Roofing?
We’ve seen this before. Last year, Tesla CEO Elon Musk announced that his electric vehicle company would branch out and start supplying a home battery...
The Solar Win-Win: Online Marketplace Benefits Installer and Homeowner
The solar market is expanding as homeowners are installing rooftop solar panels in an attempt to reduce their electric bills and their carbon footprint. However,...
Importance of Power Tolerance in Solar Panels
This paper highlights the importance of power tolerance when choosing solar panels. Power tolerance is a measure of how much electrical power a solar panel...
Gauging the Bankability of Small to Mid-Sized Solar Installers
The entire world is going green and moving toward cleaner sources of energy. California hosts a flourishing solar industry with a burgeoning number of solar...
Ann Arbor Takes Steps to Promote Residential Solar
Home to Michigan’s largest solar panel array of 1.1 MW and one of the top green research universities in the country, Ann Arbor has a...
Measuring Home Energy Use
One of the most important steps before installing home solar is figuring out how much energy your home uses, and how big your solar energy...
My Installer vs. The Perfect Installer
Every solar installer has an opinion about how to choose a solar installer. Those with the most service time under their belts and those who’ve...
How to Choose A High Quality Solar Installer
Tip 1 – Ask Friends, Families, and Neighbors If you live in California then there’s a good chance that you know somebody who has already...
Three Things to Avoid When Installing Your Solar Panel System
At Solar.com, we have a lot of experience in the solar panel industry. Every day we help people to install panels on their homes, and...
The Benefits of Floating Solar Panels
Floating solar panels utilize the same technology as the panels that you put on your roof. The main difference is that they’ve been adapted...
The Top Three Solar Manufacturers
At Solar.com, we believe in supplying quality equipment for our customers. In the last twenty years, solar technology has grown exponentially, costs have plummeted, and...
Why "Falling Back" is Bad for Solar
With daylight savings recently ending, it is that time of year again to reflect on why “falling back” is a really bad idea. In the...
Elon Musk's Gigafactory Should Be Dictating Your Solar Equipment
All solar installations today should be thinking ahead to the not-so-distant future. The main question to be asking is whether your solar system will seamlessly...
The Solar “Tipping Point” is Looming
We all know why people go solar: investment purposes, immediate savings, environmental concerns, and grid independence. But who are these people? One of Malcom Gladwell’s...
4 Mistakes Homeowners Make When Going Solar
Buying a solar system for your home can be a confusing process. At Solar.com we’re committed to helping homeowners sort through it all and...
Does Solar Panel Efficiency Really Matter?
Installers who sell high-efficiency panels love to flaunt that point when selling their system. But in most cases, panel efficiency doesn’t count for much, except...
Why Choosing the Right Solar Installer is So Important
The quality of work put forth by your solar installer is the most important aspect of your solar installation. An inverter malfunction or dirty...
Solar Installation Horror Story
The following letter is from a very reputable company in Solar.com’s installer network to a homeowner who was unfortunately taken advantage of by an installer...
Bankability: What it Means and Why it is Important for Your Solar...
Homeowners who are considering solar typically overlook the manufacturer of their solar panels, despite this being one of the most important factors for the longevity...
How ‘Big Data’ Will Change The Solar Industry
The U.S. Department of Energy invests in new technology to revolutionize the landscape of solar data. Reliable solar grid data, the true performance of solar...
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