Frequently Asked Questions

Important questions to ask a contractor:

Top Question No 1: Is the installer a licensed electrical contractor and exclusively focused on solar PV?

LightWave Solar holds an electrical contractors license in the states of TN, MS, AR and AL. We are 100% focused on solar PV and energy storage system design and installation with over 35 full‐time employees.

Top Question No. 2: What is included in the contract amount?

LightWave Solar provides turn‐key design and installation.  This includes:

  • Site evaluation to verify system design requirements
  • Electrical drawings and site plans by in‐house engineers
  • Completion of interconnection application and all other paperwork required by local utility
  • Permitting
  • Equipment procurement (panels, inverters, disconnects, meter, conduit, wire, etc. – everything needed for fully functional system)
  • Installation and inspections
  • Grid‐interconnection/commissioning with local utility
  • One‐year workmanship warranty

The questions we get asked the most about solar:

How does a solar electric system work?

Solar simply works! Sunlight excites electrons in solar panels, and the electricity flows to an inverter where it is converted from direct current (DC) to alternating current (AC), the type of electricity our homes and businesses use. Solar systems are connected to the grid through the local utility to reduce your electric bills, and solar systems can charge batteries to provide backup power during grid outages.

What size system do I need?

System size is usually determined by your electrical consumption, your available roof or yard space and your budget. We will measure your site to verify space and shading, and we will show you how a solar system will impact your monthly electric bills.

How much does solar cost?

The cost of solar depends on many variables, but a typical residential solar + battery system costs $50,000-$60,000 before the federal tax credit. This includes everything required to provide a fully installed, grid-tied system with backup power. Additional costs would be required for a ground-mount system, long distance ground work, concrete work, or extended travel.

What are the financing options?

Commercial solar projects
Our customers have obtained commercial solar loans through BB&T, First Farmers & Merchants, Pinnacle Financial Partners, Pathway Lending and more. In fact, BB&T partnered with LightWave Solar to provide customized financing options for commercial solar installations, including an attractive equipment loan with interest rates as low as 6% for qualified customers. Contact LightWave Solar to discuss your project and goals.

Residential solar projects
Our recommended lender for residential solar projects is Clean Energy Credit Union, a not-for-profit financial services cooperative that’s focused solely on clean energy lending, including residential solar loans. Learn more about Clean Energy Credit Union here. Another good option is a Home Equity Line of Credit (HELOC) through your mortgage lender.

What are the available incentives?

  • The 26% Federal Investment Tax Credit (ITC) is available for commercial and residential solar systems placed in service by 12/31/20. The credit amount is uncapped and equal to 26% of total system cost. For commercial solar systems, businesses can claim the 26% tax credit by beginning construction in 2020. For projects installed in 2021, the tax credit drops to 22%. Contact us for details.
  • For businesses: Accelerated Depreciation, known as Modified Accelerated Cost Recovery System (MACRS), is a method of depreciation in which a business’s investments in solar property can be recovered through tax deductions. Under the 2018 tax plan, MACRS benefits can be taken all in the 1st year and equal about 20% of solar project costs. Taken together, tax benefits for commercial solar projects reduce costs by about 45%.
  • For eligible rural businesses, USDA offers a 25% grant for solar systems. LightWave Solar has grant writers on staff, and our grant approval track record is 98%. Next USDA REAP grant application deadline is October 31, 2020.

What steps should I take to decide if solar is right for me?

  • Find your last electric bill to help us determine your annual use.
  • Look at your existing electric service and note number of main service panels and amperage. For example, you might have one or more 200-amp main service panels. This info will help us determine your backup capabilities.
  • Consider what site might be the best location. Solar performs best on south-facing roofs. East/west roofs with low pitch are also suitable. There should be little or no shading from trees, chimneys, and dormers. If the roof is not suitable, we can install panels on another structure or on the ground. We have shade analyzing tools that help determine the best location for solar panels.
  • Explore our residential info pages, and contact us for a free consultation and preliminary estimate.

What happens during power outages?

If you would like to have solar power during a grid outage, you will need battery storage. You can learn about our solar + storage systems here. Without battery storage, a grid-tied solar system must shut down until utility power returns so that it doesn’t back-feed the grid. When grid power goes out, the inverter will automatically shut off. When the grid power is re-established, the inverter will automatically turn back on after it has synchronized with the utility grid.

Will my system work on cloudy days?

Yes! But it will be less productive. Production is proportionate to the thickness of cloud cover.

How will I know if my system is producing what it should?

Most of our systems include online production monitoring so you can see your system’s perfotmance on any computer or smart phone. You can compare your solar production to our estimates to ensure your system is on track.

How long does it take to install the system?

For a typical residential system, it takes about three days to install the PV panels and equipment.  Then, the system must pass a final State electrical inspection which normally occurs within 10 days of completed installation. Then, we schedule system activation with your local power company.

What are the panel, inverter and battery warranties?

The solar panels we install have a product warranty for 25 years and a power performance warranty for 25 years. The power performance warranty means that by the end of year 25, the panels’ actual power output will be no less than 80% of the labeled power output. Most of the inverters we install are warrantied for 10 or 12 years, and many brands offer an extended warranty. Tesla Powerwall batteries and LG Chem batteries both have 10 year warranties.

Can the solar panels withstand high winds and hail?

The panels are supported by high quality stainless steel and aluminum racking systems designed and mounted based on American Society of Civil Engineer (ASCE) wind load provisions. All solar panels are tested to UL-1703 standards and are capable of withstanding one inch (2.5cm) hailstones at 50MPH.  They are covered with tempered glass, akin to a car windshield.  Additionally, the panels can be covered by homeowners insurance.

What do I need to know about solar system installation?

We mount solar panels on your roof or on a ground-mount structure and run wires through conduit to an inverter. Wires from the inverter’s output go through conduit to an exterior-mounted solar disconnect. From there, we run wires through conduit to your breaker panel, which allows your home to use the electricity flowing from your solar panels. Whenever possible, we mount all gear close to your utility meter, and it occupies a space about 3′ tall x 4′ wide. To store solar power for consumption at night or during a grid outage, we can add batteries to your system. Each battery is about 45” tall x 30” wide x 6” deep and can be installed indoors or outdoors.

What if I need a new roof or I am building a new house?

You want your roof to be in the best condition possible because the average working life span of a solar system is around 30 to 40 years.  Thus, we don’t recommend installation on composition shingle roofs over 10-years-old. If you are building a new house, click here for guidance on building a solar-ready home.

Can a solar system increase the value of my home?

Yes! A solar system reduces electric bills which can make it a valuable asset to any homeowner. According to a 2015 Berkeley Lab report, solar adds at least $15,000 to the value of a home. The report shows an average selling price increase of $3.75/watt ($18,750 for 4kW system). Click here to view the report summary.

Do I need approval from my homeowners association?

Some homeowners associations have rules regarding the installation of anything on your roof or grounds. If you belong to a homeowners association, contact them and ask about neighborhood guidelines.  In our experience, most homeowners associations decide in favor of solar system installations.

Which is for me - solar, solar with batteries, or an off-grid system?

Check out our three residential solar options here. Our job is to help you decide which solar option will work best for you and your home. Contact us and start your journey of generating clean, renewable solar energy!

Excellent, turn-key solution for solar panels. They were very responsive to my emails.
Matthew Lipton
Matthew Lipton
20:46 22 Jun 20
Lightwave Solar installed a 10 kw system on my building in Lebanon. The installation crew was very professional and completed the install in a morning. Lightwave handled all the permitting and negotiations with TVA/MTEMC. I now have an app on my phone that tells me how much power my panels are generating since they were installed.
Peter Schulert
Peter Schulert
16:58 22 Jun 20
The folks at LightWave Solar are awesome. They were patient and very responsive to my long list of questions prior to signing the contract. After signing the contract, they kept me updated on progress and walked me through steps that required my input on the permitting process. They made me aware of the current step and the next step so I knew what to expect. The installation crew was knowledgeable, efficient, friendly, and went overboard to make sure the installation met my needs. The accounting folks were also great to interact with. Every aspect of my solar purchase went smoothly thanks to the great people at LightWave....from the initial sales, business office, and installation crews--all of them make customer service a PRIORITY.
Mike Woodside
Mike Woodside
14:00 21 Jun 20
One of the best companies hands down. When it comes to light wave solar there is no other companies that can compare
justin harris
justin harris
13:20 04 Jun 20
We had a great experience with Lightwave. They installed an add on system of 5kW along with a Tesla Powerwall battery. From the initial presentation to the final project completion, they all worked together and everyone on their team seemed truly happy to be engaged in this new industry. They are true professionals and I was glad we selected them. In addition to having a high tech back up system for my home, I am now off grid about 30% of the time. Amazing.
Quentin Humberd
Quentin Humberd
11:06 06 Dec 19
Wonderful experience from beginning discussions to project completion. On time, on budget and a pleasure to work with these folks
David Goodridge
David Goodridge
19:50 31 Oct 19
LightWave provided excellent service from design through applications through installation. We are very happy with the performance of the system.
Michael Dennis
Michael Dennis
01:20 04 Aug 19
LightWave Solar, LLC installed a 10 kW Array for us and did an excellent job! They completed the Array installation on time and with in budget.
Brian Nothnagle
Brian Nothnagle
18:49 23 Jul 19
The staff was incredibly friendly and knowledgable. in addition to keeping the area clean , we are very happy with the work and the price.
Denis Savouray
Denis Savouray
13:11 30 Nov 18
Light Wave Solar is terrific. All their people were great to work with, knowledgeable and on- the- ball. They were everything i could have asked for and i couldn't be happier with the system they installed. So far it is working just as i hoped!
Jeanie Stephenson
Jeanie Stephenson
23:00 26 Nov 18
I needed LightWave's help after a wind storm caused a tree to fall on my house. The tree destroyed ten solar panels on my roof. LightWave's technicians visited me to assess the damage and plan repairs. LightWave's project manager took over from that point. After the design was complete and approved, the installation crew completed the job in a single day. Every LightWave representative was pleasant and professional. I would recommend them to anyone who needs their services.
Mike Wiedemer
Mike Wiedemer
18:41 25 Oct 18
The whole team at LightWave Solar did an all-around excellent job! They showed up on time as expected and communicated everything very clearly on what I can expect to see and happen. They were all very professional and courteous throughout the entire process. I am already seeing MUCH lower electric bills. Thanks again to everyone at LightWave Solar, I greatly appreciated your services.
Nick Mielnik
Nick Mielnik
18:41 22 Oct 18
The entire team at LightWave Solar went above and beyond to ensure that our solar install was done on time, on budget, and to our satisfaction. Professional in every way. I can't get over how seamlessly they have integrated everything to our 1960 built home. Very well done. An added bonus is their handling of the necessary licenses, myriad forms and paperwork and approvals from local power company and TVA. These guys deserve 10 stars!
Shawn Kries
Shawn Kries
18:12 16 May 18
Great service and solar products. Professional installation and technical support. Installation quality outstanding.
Dan Larsen
Dan Larsen
13:56 22 Feb 18
Very happy with our 50KW solar panel array commercial system. Lightwave was extremely easy to work with.
Mark Fournier
Mark Fournier
13:19 08 Feb 18
We installed a 10 KW solar panel array on the roof of our home this past fall. The process required coordination between us (the customer), the local electric company (Nashville Electric Service) and the Tennessee Valley Authority (TVA). While this may seem daunting, it turns out that apart from signing a few routine documents, the process requires little to no effort on the part of the customer: Lightwave Solar takes care of all the details. Their attention to those details was impressive, which meant the whole operation was smooth, professional and basically worry free. The physical installation itself is a marvel of craftsmanship and technology. Lightwave Solar fully earns their five star rating and I recommend them without reservation.
David James
David James
06:07 22 Jan 18
Expert system design and expert install. Couldn’t be happier. Installed grid-tied roof-mounted 30kw system on rural lodge. Very happy with results on electric bill.
Greg Gough
Greg Gough
02:27 20 Jan 18
My first month's savings was over $100. This is in spite of shorter fall days, cloudy days, and rain. The shortest day of the year is in late December. Its best performance will be in the spring and summer. I am very pleased with it.
Gerald Dooley
Gerald Dooley
18:26 27 Oct 17
Lightwave's staff was professional and responded to all of my concerns. Installation was a breeze and their followup after the system was installed has been rapid. I highly recommend LightWave for any solar project.
Rebecca Paschal
Rebecca Paschal
17:54 24 Oct 17


The North American Board of Certified Energy Practitioners (NABCEP) is the most respected, well-established, and widely recognized certification organization for U.S. solar professionals. Our team includes 8 fully certified NABCEP Solar PV Professionals – more than any other firm in the region.

  • Matt Duncan
  • 042118-20383
  • Justin Huff
  • 102018-11298
  • JP Plumlee
  • 081112-56
  • Daniel Hodge
  • Karl Jaeger
  • Steve Johnson
  • Billy Jones
  • Matt Pelerossi
  • 100414-10606
  • 032407-30
  • 032407-31
  • 032611-157
  • 100414-10493


  • TenneSEIA
  • SolarReviews
  • LG Solar Panels
  • Sunpower
  • Tesla Powerwall Certified Installer
  • Amicus Solar Co-op
  • Amicus Solar Operations and Maintenance
  • Lumos Solar Certified Installer
  • AAEA
  • Solaria Pro Partner
  • LG Pro Gold
  • REC - Certified Solar Professionals