PV Solar Panel System Cost in 2021: Pros and Cons of Solar Panels

Updated on December 31st, 2020

Sunlight made into electricity. It’s that simple. Enough electricity to power not just a few appliances, but an entire home, including transportation in case of battery electric vehicles (BEV) or plug-in hybrids. That’s where we are quickly heading, but let’s deal with the basics of solar power for homes, first.

Solar and PV Encapsulated
Effective Means of Capturing Awesome Power
System Components and Function
Hiring A Contractor – Costs Further Explored
Advantages of PV Solar Panels
Disadvantages of PV Solar Panels

Solar and PV Encapsulated

PV stands for Photovoltaic. — The quantifiable process of converting sunlight (solar) into electrical power. For the conversion to be realized and useful, the right semiconducting material must be in place. — This results in efficiency that helps us put into perspective how solar energy can and does compare to historical methods of producing electrical power.

Solar cells are the fundamental, man-made part. Each cell produces about 1 to 2 watts of power. While that isn’t much, for the small size they are, it’s actually quite sufficient.

Group cells together into modules and stack modules into arrays, and suddenly kilowatts of electric power can be realized. To visualize what we are communicating, check out this short video from the U.S. Department of Energy.

For the solar cell to be effective, it must be protected. Durable glass for its transparency is the obvious choice and results in the modules we call PV solar panels.

A module can be as small as those found on calculators, which date back to mid-20th century technology. Or modules can be arranged as solar arrays, which today is what we consider to be a solar panel system.

Contemporary solar cells are manufactured in about a half dozen ways. The ongoing and still most popular material is crystalline silicon. – Its relatively high efficiency in converting energy supplied by photons to electrical power is why it continues to be popular.

Monocrystalline vs. Polycrystalline Solar Panels
There are two main types of solar panels on the market today: monocrystalline and polycrystalline.

Monocrystalline panels provide anywhere from 17% to 22% solar energy-to-electricity conversion efficiency, while polycrystalline panels achieve between 13% and 16% conversion efficiency.

Thanks to their higher energy conversion efficiency, monocrystalline panels are more costly on a per watt basis than polycrystalline panels, but they do occupy less space on the rooftop. Hence, if the rooftop span and size are limited, it makes sense to pay a little extra for high-efficiency polycrystalline panels.

For more cost-effective (but less efficient on a per square foot basis) solar power systems, second generation solar cells can be packaged into thin film photovoltaic materials designed specifically for commercial standing seam metal roofs. Currently, this is where much of experimental technology is occurring and emerging.

It also leads to BiPV materials, or solar cells integrated into construction materials, such as the case with Suntegra and other emerging BIPV solar shingles and tile offerings.

Because solar panels, of the non-integrated variety, are still the dominant option in the residential and commercial solar power market, we focus on the components, costs, and advantages/disadvantages for this type of PV system.

Effective Means of Capturing Awesome Power

Each hour, there’s 122 Petawatts of solar energy delivered to the earth from the sun. To help put this in perspective, this is around 10,000 times the power consumed by all humans in one trip around the sun (aka 1 year).

In the last century, we are just learning to tap into solar energy in a meaningful way. Efficiency of cells and ultimately arrays is the ongoing work of research scientists. Highest efficiency arrays are either too experimental for mass production or are relegated to government and major industry purposes.

For a home, the process of solar generation into electrical power requires other technologies to be in play. Foremost is placement of arrays.

Positioning toward the south is a given. Thus, rack mounting panels onto a southern-facing exposed and unobstructed rooftop is the norm. Though, not necessarily the most efficient.

A solar panel mounted on the ground that tracks the movement of the sun is currently the most efficient way to harness solar energy through a PV system. — It can, rather easily, power itself, plus have power left over to supply power to many other applications.

Yet, this type of system is generally more costly upfront, is not suitable to all forms of residential living, and requires much more ongoing maintenance than rack-mounted systems.

System Components and Function

For every PV system, there are generally 4 primary components. The solar panel, which we’ve described already. A controller, which is what regulates the amount of electricity in the system, but particularly to the battery.

You didn’t think the power was directly feeding the needs of the home, did you? No, a battery is in place so electrical energy is stored for later use.

The last primary component is the inverter. Energy stored in a battery needs conversion, from DC electrical current, to AC, in order to power most modern conveniences. That’s what the inverter is for.

It’s helpful to understand there are essentially two types of systems you would install for a home: off-grid and on-grid. Off-grid is perhaps what most who are new to solar power conceive a system to be.

It means all power generated from the PV system, will be used solely to power the structure it is connected to. Whereas on-grid (or grid-tied) systems feed to the local utility provider, and then back to the home in a metered process.

Each of the two methods have their advantages and disadvantages. Because storing energy inevitably leads to wasted energy, it is usually far more cost effective for a homeowner to go with a grid-tied system.

It is unlikely that a homeowner would use all the power generated from their solar panels, and so in essence the utility company is paying you for that energy and then providing that same cost back to you for that electricity.

So, you pay for what you need and don’t pay for wasted energy. In this case, the utility company serves as the virtual battery within the system.

Advantages of off-grid are few but depending on the situation with your residence or style of living can outweigh the advantages of being on the grid.

If living in a rural area, with less access to a utility company, then the costs to get into the grid would be prohibitive for most to make it worth their while to go solar.

Plus, there’s just the notion of being inherently self-sufficient without relying on the utility company for power storage.

Installation costs are the determining factor for most homeowners ready to move in this direction. It takes more homework than we can possibly provide should you choose to go the DIY route and, for sure if you are considering going with an off-grid system.

However, let the guys at WholeSaleSolar.com and GoGreenSolar.com to help get you started in that direction.

Note: we are not affiliated with the above companies, but are listing them here for DIY enthusiasts who want to save money on the cost of professional installation.

Hiring A Contractor — Solar Panels System Costs Further Explored

One important advantage of installing solar panels on your rooftop, is the availability of the generous 26% federal solar investment tax credits (ITC) that were recently extended through the end of December 31st, 2022.

Therefor, for years 2020 through 2022, whatever amount you spend on the installation of a PV solar system, you can get a rebate of 26% off the full amount (22% in year 2023, the last year of the program unless further extended). You will need to apply through the government first, but the savings of thousands of dollars are very likely well worth it.

Next is the realization that you’ll be generating clean home electricity, while also saving thousands of dollars per year on your home electricity costs.

So, essentially there’s a cost per watt factor that needs to be calculated and then determined by you, the homeowner, to ensure it is worth your time and money. Chances are it is, and the latest information is that the costs of solar panels continue to decline, while their efficiency keeps improving.

If basing decisions on the information from even 5 years ago, it may lead you to think it is too unaffordable. Yet, what hasn’t changed is that a typical residential solar panel system will save 30% to 70% off your utility bills when fully implemented.

Walking you through all the considerations is challenging to do in short order. Fortunately, the information at Center for Sustainable Energy, SunPower.com (manufacturer of high-efficiency panels, no affiliation), and EnergySage.com (no affiliation), does this quite nicely.

The key information is that your cost for material is greatly enhanced if going with a buyer (hired professional) that has greater buying power than you.

Once you do the math on your own, you’ll realize what you can afford in terms of amount of panels and the watts generated from such a system. With a pro at your side, you can likely afford more panels, and reduce your cost to watt ratio.

Note that professional installation costs represent well over 50% of the total cost of installing a residential solar power system.

Some key factors and considerations with professional installation include:

  • surveying your home’s roof for orientation, ability to hold the extra weight, and determination of panels is a first step, that may take awhile. Especially if additional permits and fees are involved.
  • determining if the company is the right fit for the job:
    • are they experienced in on-grid installations?
    • can they provide examples of their work?
    • how many years have they been in business?
    • how much experience do they have installing PV systems?
    • are they properly licensed and certified? Don’t just take their word for it, call the county where you live to check on this.
    • what warranties can they provide? And do you truly understand what the warranty is covering?
  • as with any job, go for more than one quote and take time to compare notes
    • be sure to compare apples to apples, or that if one contractor offers bid for something another didn’t include, then follow up and ask for that cost estimate
  • what does maintenance entail after installation? Who’s responsible for that?
  • After all the information is in, are you really saving money over say a 10 year period?

Residential PV Solar Panels System Cost

The upfront costs are usually the reason most people don’t go with solar energy. $15,000 to $20,000 in upfront investment can be a lot when you compare it to a yearly bill of say $1,200 for current energy costs.

In 2020-2022, the national average cost per watt installed can range between $3.00 and $3.50, depending on the system size and your home’s location. The cost per watt can be significantly higher if you go with a large national installer like SunRun, Vivint Solar, or SunGevity.

For a complete 6kW residential PV solar system installed by a small local installer, the cost can range between $18,000 and $21,000. Yet if we factor in the 26% federal tax credit rebate through 2022 (22% in 2023), then the final cost will range between $13,320 and $15,540. Still, there are enough factors to consider that could lower or raise the price.

Which leads to our last consideration of leasing panels instead of owning them. The solar leasing company owns the panels, handles installation and you reap the benefits of lower energy bills. However, this comes with a few caveats, such as:

  • the federal rebate goes to them, not you
  • you still pay full price to the utility company for energy used there, even if its reduced some. Plus you are paying the solar leasing company for the energy they are providing you.
  • if you sell your home before the lease is up, the lease may say you’re still obligated for payments, or you hope the new owner is willing to eat that cost

With all that said, leasing does make it more affordable on the front end, but less of a solution over the long haul.

Advantages of PV Solar Panels

  • Contributing to clean energy. There’s no combustion involved in this energy production. No unwanted emissions of gas into the atmosphere.
  • Rebates and incentives exist for going in this direction (assuming you own the panels)
  • Abundance of fuel supply (or as long as there’s a sun around)
  • The system is quiet, silently producing energy for the home
  • Very little maintenance
  • Costs for materials continue to decline, making it more and more cost effective

Disadvantages of PV Solar Panels

  • If going off-grid, the power supply is interrupted by natural event of no energy at night
  • Upfront costs are substantial, especially if responsible for own storage
  • Winter months may pose less energy, especially given less daylight hours. Whereas heat energy is usually needed more during this season.
  • Likewise, if panels are covered in snow, that hinders the whole process in the system, or contributes to routine maintenance.
  • May not be aesthetically pleasing, or even uncharacteristic to the neighborhood
  • Not knowing the right time to buy as costs may go down even more or better technology is due out sooner than anticipated

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