Solar Loan vs Home Equity Loan: How to Choose

When you have decided to go solar, one of the biggest decisions is not which panels to buy, but how to pay for them. Two popular options are a dedicated solar loan and a home equity loan. Both let you spread the cost over time, but they work in very different ways. Understanding how to choose between solar loan and home equity loan can save you thousands of dollars and prevent unnecessary risk to your home. This guide breaks down the key differences, the pros and cons of each, and the specific questions you need to ask yourself before signing any agreement.

Why Financing Type Matters for Solar

The financial structure of your solar purchase affects your monthly cash flow, your total interest paid, and even the resale value of your home. A solar loan is a type of personal property loan that is secured by the solar equipment itself. A home equity loan, by contrast, is a second mortgage that uses your house as collateral. Because the security is different, the interest rates, terms, and qualification requirements vary significantly.

Choosing the wrong option can lead to higher costs or, in the worst case, put your home at risk. For example, if you default on a home equity loan, you could face foreclosure. Defaulting on a solar loan typically means losing the solar system, not your house. However, solar loans often have higher interest rates because the lender takes on more risk.

To make a smart choice, you need to compare the total cost of each option, including fees, interest rates, and potential tax implications. You also need to think about how long you plan to stay in your home, because that affects whether you will recoup the upfront costs through energy savings.

What Is a Solar Loan?

A solar loan is a financing product specifically designed to pay for solar panel installation. These loans are usually unsecured or secured by the solar equipment, not by your home. They come in two main forms: secured solar loans (where the lender places a lien on the solar system) and unsecured solar loans (which are based on your credit score and do not require collateral).

Solar loans are offered by solar installers, specialized finance companies, and some banks. They often feature promotional interest rates, especially for the first year or two, but those rates can jump significantly after the promotional period. The loan term typically ranges from 5 to 25 years, and monthly payments are designed to be lower than your typical electricity bill.

Advantages of Solar Loans

• Quick and easy approval: Many solar lenders offer online applications and same-day decisions, with no home appraisal required.
• No home equity needed: You can finance 100% of the system cost, even if you have little equity in your home.
• Keeps your mortgage untouched: You do not have to refinance your primary mortgage, which means you keep your current low rate.
• Ownership benefits: You own the system outright, so you can claim the federal solar tax credit and any state incentives.

Because solar loans are not secured by your home, they are generally faster and less invasive to obtain. You do not need a home appraisal or a title search. The application process is often completed online in minutes, and funds are disbursed directly to the installer. This makes solar loans an excellent choice for homeowners who want to move quickly and avoid the paperwork of a mortgage product.

However, the convenience comes with trade-offs. Interest rates on unsecured solar loans can be 3% to 6% higher than a home equity loan, depending on your credit. Also, the loan is tied to the solar system, so if you move before the loan is paid off, you may need to transfer the loan to the new homeowner or pay it off in full, which can be a barrier to selling your home.

What Is a Home Equity Loan?

A home equity loan, often called a second mortgage, allows you to borrow against the equity you have built up in your home. You receive a lump sum of cash and repay it over a fixed term, typically 10 to 20 years, with a fixed interest rate. Some homeowners use a home equity line of credit (HELOC) instead, which works more like a credit card with a variable rate.

Because the loan is secured by your home, lenders are willing to offer lower interest rates compared to solar loans. The interest you pay may also be tax-deductible if you use the funds to substantially improve your home, and a solar installation qualifies as a home improvement in many cases.

Advantages of Home Equity Loans

• Lower interest rates: Rates are often 2% to 5% lower than solar loans, translating to significant savings over time.
• Potential tax deduction: Under current tax law, interest on home equity loans used for home improvements may be deductible, subject to limits.
• Longer repayment terms: You can stretch payments over 20 years, which reduces your monthly obligation.
• Flexible use of funds: You can use the money for solar plus other renovations, like a new roof or battery backup.

For homeowners with substantial equity and good credit, a home equity loan can be the most cost-effective way to finance solar. The lower interest rate means you pay less in total interest over the life of the loan, and the longer term allows for more manageable monthly payments. In our guide on solar loan vs lease, we explain how ownership affects your savings, which is a key factor when using home equity.

The main drawback is that you are putting your home on the line. If you fail to make payments, the lender can foreclose on your property. Additionally, home equity loans come with closing costs, such as appraisal fees, title search fees, and loan origination charges, which can add 2% to 5% to the loan amount. You also need to have at least 15% to 20% equity in your home, which many newer homeowners do not have.

Key Differences at a Glance

To help you compare, here is a quick breakdown of the main differences between solar loans and home equity loans. Keep these in mind as you evaluate your options, because they directly impact your financial health.

• Collateral: Solar loans are often unsecured or secured by the system. Home equity loans are secured by your house.
• Interest rates: Solar loans have higher rates, often 6% to 12%. Home equity loans are lower, often 4% to 8%.
• Qualification: Solar loans require good credit but no home equity. Home equity loans require sufficient equity and a clean title.
• Fees: Solar loans may have origination fees, but home equity loans have closing costs that can be substantial.
• Tax benefits: Interest on both may be deductible, but home equity loan interest is more clearly deductible for home improvements.

These differences matter because they affect your total cost and your risk exposure. A home equity loan might look attractive because of the lower rate, but the closing costs and the risk of foreclosure are real downsides. Conversely, a solar loan might have a higher rate, but it keeps your home out of the equation, which offers peace of mind.

How to Choose Between Solar Loan and Home Equity Loan

Now that you understand the basics, here is a step-by-step process to help you decide which financing path is right for you. The goal is not to pick the option with the lowest monthly payment, but the one that offers the best balance of cost, risk, and flexibility for your unique situation.

Step 1: Evaluate Your Home Equity

First, calculate how much equity you have. You can estimate this by subtracting your current mortgage balance from your home's market value. Lenders typically require you to keep at least 20% of your home's value as equity after taking out a home equity loan. So, if your home is worth $400,000 and you owe $200,000, you have 50% equity. You can borrow up to $120,000 (the amount that keeps you at 20% equity). A typical solar installation costs between $15,000 and $30,000, so most homeowners with moderate equity can qualify.

If you have less than 20% equity, a home equity loan is not an option, and a solar loan becomes your only choice. If you have plenty of equity, you can compare the actual interest costs of both loan types.

Step 2: Compare Interest Rates and Fees

Get quotes from at least three solar lenders and two home equity lenders. Ask for the Annual Percentage Rate (APR), which includes fees, and the total cost of the loan. Use an online calculator to see the difference in total interest paid over the life of the loan.

For example, a $25,000 solar loan at 8% interest for 12 years would have a monthly payment of about $270 and total interest of about $13,900. A home equity loan at 6% interest for 20 years would have a monthly payment of about $179 and total interest of about $17,900. Even though the home equity loan has a lower rate, the longer term means you pay more interest overall. However, the lower monthly payment can free up cash for other investments.

You should also factor in the tax deduction. If you are in the 22% tax bracket and can deduct the interest on a home equity loan, your effective interest rate drops. For a $25,000 loan at 6%, you might save $330 per year in taxes, which reduces your net cost.

Step 3: Consider Your Plans to Stay in Your Home

If you plan to move within the next 5 to 10 years, a solar loan can be problematic. When you sell, you need to pay off the remaining loan balance, which can be thousands of dollars. Some solar loans are transferable, but the new buyer must qualify. Many homeowners find that they have to reduce their asking price to attract a buyer who will take over the solar loan.

A home equity loan, on the other hand, is paid off by the buyer when they purchase your home, as it is part of the mortgage payoff. This makes selling easier, but you still need to have paid down enough of the loan to realize a profit. If you plan to stay for 15 years or more, the longer term of a home equity loan may be okay, but you will pay more interest.

Step 4: Assess Your Credit Score

Solar lenders and home equity lenders both look at your credit score, but they have different thresholds. Solar loans often accept credit scores as low as 600, while home equity loans typically require a score of 680 or higher. If your credit is below 680, a solar loan is more accessible. If your credit is excellent, you might qualify for a promotional solar loan rate that is close to a home equity loan rate.

It is wise to check your credit score before applying. If you have time, improve your score by paying down debt and correcting errors, then reapply. A higher score will unlock better terms on both types of loans, potentially making a solar loan more competitive.

Step 5: Evaluate the Risks

The most critical difference is the risk to your home. With a solar loan, the lender can repossess the solar panels, but your home is protected. With a home equity loan, the lender can foreclose on your home if you default. If your financial situation is unstable, or if you want to avoid any chance of losing your home, a solar loan is the safer choice.

On the other hand, if you are disciplined and confident in your ability to make payments, the lower interest rate of a home equity loan can save you thousands. You need to weigh the potential savings against the risk of foreclosure.

Additional Considerations for a Smart Decision

Beyond the numbers, there are practical aspects that can influence your choice. For instance, some solar installers offer loans that include a 0% down payment and no payments for the first year. While these are attractive, they often come with a higher APR after the promotional period. Make sure you read the fine print and calculate the total cost after the promotional rate ends.

Another factor is the federal solar tax credit. As of 2026, you can claim 30% of your solar installation cost as a tax credit. If you finance with a solar loan, you can finance the gross cost and use the tax credit to pay down the principal. If you use a home equity loan, you pay the contractor in cash and then claim the credit on your taxes, which you can use to pay off a portion of the loan. In both cases, you benefit, but the timing and paperwork differ.

You should also consider the impact on your debt-to-income ratio. A home equity loan adds to your mortgage debt, which can affect your ability to refinance or take out other loans. A solar loan is often treated as a personal loan, which may have a smaller impact on your ability to qualify for a future mortgage. Lenders vary in how they treat these debts, so it is best to ask your financial advisor or loan officer.

When a Solar Loan Makes More Sense

A solar loan is usually the better option if you meet any of these conditions: you do not have enough home equity, you want to avoid the risk of foreclosure, you plan to move in the next 5 to 10 years, or you want a simple, fast application process. Solar loans are also ideal if you are leasing a system and want to buy it out, as some lenders offer refinancing for existing leases.

For example, first-time homebuyers often have minimal equity, so a solar loan is the only feasible way to finance a solar system. Likewise, if you are not comfortable with the idea of a second mortgage, the peace of mind from a solar loan is worth the higher interest rate.

When a Home Equity Loan Makes More Sense

A home equity loan is advantageous when you have substantial equity, a stable income, and a long time horizon in your home. If you plan to live in your home for 15 years or more, the lower interest rate will save you money over the long run, even after accounting for closing costs. You also benefit if you are using the funds for multiple home improvements, as you can bundle solar with a new roof or kitchen remodel.

Another scenario is when you have a low credit score, a home equity loan might not be available, but if you have a high score, the rate difference between a solar loan and a home equity loan can be significant. In that case, taking the home equity loan and paying it off over 10 years (instead of 20) can give you the best of both worlds: a low rate and a reasonable term.

Final Thoughts on Financing Your Solar System

Choosing between a solar loan and a home equity loan is a personal decision that depends on your finances, your home, and your goals. The best way to proceed is to gather multiple quotes, run the numbers, and consider how each option fits into your broader financial plan. Remember that the cheapest monthly payment is not always the best deal. Look at the total cost, the interest rate, and the risk to your home.

If you are still unsure, consult a financial advisor or a trusted solar consultant. You can also get free quotes from vetted installers through platforms like SolarEnergy.ai, which provides tools and resources to help you compare costs and terms. Ultimately, the right financing is the one that lets you enjoy the benefits of solar power without causing financial stress. Take your time, do your homework, and you will make a choice that powers your home and your savings for years to come.