Calculate a monthly solar loan payment on the system you home needs

Calculate a monthly solar loan payment on the system you home needs

Find out what a likely monthly solar loan payment would be for your home

Written by Andrew Sendy

Updated August 13, 2021

7 minutes read

Categories: Solar 101, Solar financing, Solar incentives, Solar panels, Solar power

Finding the cheapest, best solar home loans

Most Americans are aware that solar panels can save them money on their monthly electric bill.

However, most people aren't able to come up with the $20,000 or so they need upfront to buy the size of system their home needs (the average American home needs a 7 kW system which is 20 x350 watt panels).

This leads us all to want to calculate if a monthly loan payment on a solar power system for our house would be more or less than the monthly electric bill savings offered by solar panels.

Installing solar panels on your home is a no brainer if you can get a zero-down solar system and the monthly payment is less than the monthly electric bill savings. Especially when you consider that electric rates will rise over time and so the level of monthly savings will rise over time

This is exactly what the calculator above shows you. It only requires you to enter your address and the dollar value of your last monthly power bill and it does all the calculations from there.

It looks very simple at the front end but the calculator is actually very complex taking into account your roof size and direction, local weather, local utility rates, tax credits and other solar incentives to produce a very accurate result

It calculates your monthly solar loan payment for the specific size of system your home needs based on local prices in your area and a 4.99%, 20-year solar loan.

It then asks local solar companies to view your roof online and send you a quote for an exact solar loan through whatever solar lender that the solar company uses.

A summary of the American solar loan market in 2020

American home and residential property owners are increasingly taking out loans to have a solar photovoltaic (PV) energy system installed as opposed to turning to third-party owners (TPO) providing residential solar leases or power purchase agreements (PPA). The number, and types, of solar loan financing providers is on the rise in parallel, as is the variety of financing options available.

The largest, market-leading TPO (third-party owned) residential solar leasing-installation companies, such as SolarCity, Sunrun and Vivint, are shifting away from solar leases and PPAs and expanding their solar loan programs as the federal solar investment tax credit (ITC) is being reduced on its way to expiration. So are more locally focused solar installation companies, who are taking advantage of a growing variety of online, third-party residential solar lending software packages and platforms in bids to enhance and expand their products, services and businesses.

Background for those new to solar:

  • The big difference between solar loans on one hand and solar leases or PPA's (Power Purchase agreements) on the other is that with a solar loan you as the homeowner own the panels but leases and PPA agreements are what is known as third-party ownership models where the solar company retains ownership of the solar panels and charges you for the power.
  • Initially, when solar was very expensive and there were few loan products available leases and PPA’s were popular but now that solar is so much cheaper, and there are more loan products available, most people prefer to own their solar panels outright and pay off a normal loan.

Net present value of solar by ownership

Image credit: < class="target-blank" href="">Institute of Local Self-Reliance

Solar loans rising

The cost of solar PV panels – the heart and soul of any residential solar PV system – continues to decline. The run of year-over-year and quarter-to-quarter declines may come to an end, however. Whether or not they do hinges on the severity of the additional import duties the Trump administration decides to impose on Chinese-manufactured PV cells and modules in light of the U.S. International Trade Commission's recommendation that additional remedies be imposed as a result of unfair trade practices.

That said, the cost of installing a residential solar PV system is as cheap or cheaper than it has ever been. The so-called "balance of system," or "soft costs," that account for the large bulk of overall residential solar PV system project costs are declining as government authorities and industry participants work to reduce the finance, legal and administrative "red tape" associated with the installation of residential solar PV systems.

In contrast to financing a residential solar energy system via a lease or PPA, homeowners that choose to do so via loans wind up owning the system. As with leases, they'll repay loans over specified periods of time, or terms, with interest charges accumulating at specified annual percentage rates.

Finding the cheapest, best solar home loans

Financing a Home Solar PV System with a Loan

In addition to choosing a solar installation company, homeowners that obtain solar loans directly from banks may want to include, and arrange for the same, or perhaps a different, solar company to monitor and service their PV system over time. Those services, as well as performance guarantees, are typically included in residential solar loan and services packages offered by high-quality, full-service residential solar installers.

The cost, and terms and conditions, of residential solar loans can vary widely across the U.S., however. Generally speaking, they should be cheaper and easier to source in states in which government leaders and regulators have instituted and continue to support robust solar energy incentives, such as California, Hawaii, Massachusetts, New Jersey and more recently, North Carolina.

Solar Review's Solar Estimate pricing engine reveals that cash purchase of a residential solar PV system in North Carolina cost an average $2.94 per watt, exclusive of the 30% federal solar ITC, as of December 2017. All other things being equal, that rises to $3.41 when financed with a loan, which makes for an average payback period of 6.8 years and an estimated average savings of $28,900 over a 15-year useful life.

In comparison, it cost an average $3.18 per watt to cash purchase and have a residential solar PV system installed in California as of last December. That rises to $3.56 per watt, before the 30% solar ITC, if financed with a loan. Both the estimated average payback period and average lifetime savings come in the same in California as they do in North Carolina, at an estimated 6.8 years and $28,900, respectively.

Leading Home Solar Loan Providers

Market-leading TPO solar lease and PPA providers SolarCity, Sunrun and Vivint also offer residential solar loans across a growing number of U.S. states through networks of qualified local installation companies. Terms and conditions may vary, but generally speaking they are designed to offer little or zero in the way of upfront costs; attractive, low annual interest rates, performance guarantees, and optional or mandatory post-installation monitoring and/or full-service operations and maintenance agreements.

Offering solar installation companies and their customers an alternative to bank financing, Spruce Finance in September 2016 added residential solar loans to the residential solar lease and solar PPA options already available on its SpruceFlow online platform.

Earlier, in May 2016, New Jersey-based NRG Energy's NRG Home Solar unit announced new, residential solar energy finance and customer relationship management partnerships with both Spruce Finance and Sunrun.

Ranked No. 1 in Solar Review's 2018 review of the Top 100 American Residential Solar Installers, Blue Raven Solar, Utah offers residential solar sales, financing and installation in eight U.S. states. Blue Raven touts two home solar financial products – BluePower and BluePowerPlus+ – that it says combine the best attributes of solar loans, leases and PPAs to finance solar ownership at zero upfront cost and with guaranteed monthly energy bill savings.

First Green Bank's residential solar loan program carries a 6.02% APR, a 20-year term and yields instant savings, according to the bank. Those interested can use First Green's Residential Solar Energy Savings Calculator to come up with a good estimate of the costs associated with financing a residential solar PV system installation with a loan.

The estimated costs of installing a 16-kW solar PV system that should meet all of the electricity needs of a 2,000 square-foot home with a monthly electricity bill of $300 should cost somewhere around $34,000, according to First Green's Residential Solar Energy Savings Calculator. That drops by $10,200, courtesy of the federal solar ITC.

As the hypothetical homeowner is now generating all the electricity he, she or they need, they reduce their average, $300 utility bill to zero. They would need to pay First Green Bank an average monthly loan repayment of around $244, but the net result is a monthly savings of around $56.

The Minneapolis-based Institute of Local Self-Reliance (ILSR) has developed an Ultimate Solar Calculator app that requires a bit more input, but should yield more accurate results. Furthermore, you can copy the app's software code and paste it into a website, or download and run it on your smartphone or other handheld telecomputing device.

What is the Solar-Estimate pick of the best and cheapest solar loans currently available in 2018?

Leading Solar Loan Programs
Loan Provider States Serviced Loan Term APR
Dividend via LightStream Nationwide 2-7 years 4.99-12.49%
Mosaic 40; 250 installers 10-25 years 2.49-7.99%
GreenSky (via One Planet Solar) All 50 states 5-30 years 3.5-6.15% (adjustable and fixed)
YGrene (Residential PACE loan) California 5-30 years 5.99-7.75%
SolarCity 22 states and Washington D.C. 10 and 20 years 2.99% and 4.99%*
(*top quality credit scores)
Sunrun 22 states and Washington D.C. 10 years From 3.99%
Vivint Solar*
(*solar loan crowdfunding partnership with Mosaic)
Arizona, California, Connecticut, Florida, Massachusetts, Maryland, New Jersey, New Mexico, New York, South Carolina, Texas, and Utah. 10-25 years 2.49-7.99%

****Note that all the information in the table above is typical but may vary.

You should be aware that dealer fees are charged by the loan provider to the solar company but these are usually absorbed by the solar company and included in the price they charge you for solar.

How do you find the best solar loan offers available in your city?

The solar installation companies that service your city will have one or a number of solar loan packages that they resell and they will include these terms in the quotes they give you. With solar loans consumers don’t usually approach the financier directly they are usually sold through the solar company you choose to do your installation.

You can enter your details (address and power use) into Solar-Estimate's solar costs and savings calculator and it will give you an online estimate of the size of system you need and the likely repayments, it will also request solar loan terms from between 1 and 4 solar companies that service your area (your choice as to how many offers you want to see).

Looking ahead

Expect the rising trend of residential solar lending to continue as banks, investment companies, financial technology specialists and solar energy installation companies become more familiar and gain confidence with each other and the long-term value of investing in residential solar loans. In September, for example, Mosaic and leading U.S. banking-financial services group Goldman Sachs inked a deal via which the former agreed to sell and the latter purchase $300 million of rooftop solar loans.

Investing in residential solar loans will produce attractive, steady and comparatively secure returns for Goldman, as well as opportunities to package them into debt securities and sell them on to clients. For Mosaic, the deal provides a $300 million capital infusion that it can use to extend new residential solar loans.

Developer of a pioneering, residential solar energy project crowdfunding platform, Mosaic numbers among the few, but growing, number of residential solar finance and financial services providers that offer solar loans to other residential solar installation/project developers. Including the $300 million Mosaic garners from selling a package of its residential solar loans to Goldman Sachs, Mosaic has amassed $800 million in capital from banks and credit unions, as well as another $650 million in borrowing capacity from financial partners.

Author: Andrew Sendy Andrew Sendy LinkedIn

As chairman of Solar Investments Inc and chairman of the largest solar panel installation company in South Australia, Andy is passionate about solar power. With his unique working background he writes on the residential solar industry in America from a unique perspective.