Investing in solar energy: Types, advantages, and how to calculate.

Investing in solar energy goes far beyond a sustainable decision; it's also one of the smartest financially viable alternatives available on the Brazilian market. 

Given the instability of energy prices and the technological maturity of the sector, installing a photovoltaic system today is comparable to investing in an asset that generates monthly dividends in the form of savings. 

However, many are still hesitant about investing, whether due to the initial cost or the options that seem confusing to the layperson.

In this article, we will understand why this is the ideal time to invest, how to calculate the return on your investment (payback), and analyze the different acquisition methods.

Why invest in solar energy now?

The scenario for solar energy Things have never been so favorable in Brazil. The main motivator is financial: the sharp drop in equipment prices. 

recent data from ABSOLAR They indicate an average reduction of around 17% in the cost of solar kits, driven by the stabilization of the global supply chain and advances in panel technology.

In addition to price, we must consider the following factors:

• Property valuation: Studies indicate that properties with installed solar energy systems can increase in value by 3% to 6% in the real estate market;
• Protection against energy inflation: While the Electricity bills are subject to annual adjustments. (often above official inflation), those who generate their own energy freeze the cost per kWh for 25 years or more;
• Legal security: The consolidation of Distributed Generation Law (Law 14.300) It brought clear rules to the sector, ensuring that investments made today will have their rules respected in the long term.

How to calculate return on investment (Payback)

O Payback This is the time it takes for the savings generated on the electricity bill to pay for the amount invested in installing the system. 

The logic is simple: After this period, all the energy generated is profit.

The basic formula for an estimate is:

• Payback (years) = Total Investment / (Average Monthly Savings x 12)

A practical example would be: 

• Total Investment: R$ 20.000,00
• Monthly Savings: R$ 500,00
• Calculation:
  • Annual Savings: R\(500,00×12=R\) 6.000,00
  • Payback: R\(20.000,00/R\) 6.000,00 = 3,33 years 

Here, the investment of R$ 20.000,00 would be recovered in approximately 3 years and 4 months.

However, for an accurate calculation, you must consider variables that fluctuate over time:

1. Local energy tariff: The more expensive the energy from your utility company, the faster the return on investment;
2. Energy inflation: The upward trend in electricity bills accelerates the payback period;
3. Solar radiation: The amount of sun available in your region (systems in the Northeast generate more than in the South, for example);
4. Degradation of the panels: A minimal loss of efficiency (around 0,5% per year) should be taken into account.

Payback in Brazil: typical scenarios

Brazil has one of the best solar irradiance levels in the world, making the return on investment extremely attractive.

Based on market models and integrator data, typical scenarios are:

• Optimistic Scenario (High Tariff + High Solar Radiation): The return may occur between 2,5 and 3,5 years;
• Average Scenario: Most residential systems pay for themselves between 4 and 5 years;
• Conservative Scenario (Long-term financing or low solar irradiance): The payback period can extend to 6 the 7 years;

Considering that the lifespan of a photovoltaic system It's 25 to 30 years, which means more than two decades of profit after the recovery period.

Types of investment in solar energy

There are basically two ways to acquire your system: using your own money or using someone else's money (financing). 

The choice depends on your liquidity and financial strategy, as we will see in more detail below.

Investing with your own capital

Paying for a solar energy system upfront is, mathematically, the option that offers the best value. higher financial return (ROI).

• Advantages: You eliminate bank interest, which is the biggest culprit in slow payback. Cash flow becomes positive immediately in the first month after approval;
• Case study: By investing R$ 15.000,00 upfront in a system that saves R$ 400,00 per month, you get a return of approximately 2,6% per month (tax-free on the savings), much higher than a savings account or CDI (Brazilian interbank deposit rate).
• Maintenance: With the asset fully paid off, the maintenance cost (cleaning and potential inverter replacements after 10-15 years) is easily covered by the savings generated.

Solar system financing

For those who don't want to deplete their savings, financing is the most popular option. The idea is to replace the electricity bill with the financing installment.

• Credit lines: There are specific lines of credit for renewable energy (e.g., Santander, BV, Solfácil) with more attractive rates than personal loans;
• Impact on payback: Interest increases the total cost of the project, extending the payback period. It is essential to calculate the Total Effective Cost (TEC).
• Pay attention to deadlines: Financing over many years (e.g., 72 or 90 months) can cause you to pay double the cost of the system. Ideally, you should aim for a balance where the monthly payment is equal to or less than your current electricity bill.

Risks and disadvantages to consider

Not everything is profit. Like any investment, there are operational and regulatory risks.

• Maintenance and cleaning: Dirty panels can lose up to 20% of their efficiency. Regular cleaning is necessary.
• Equipment failure: The inverter is the heart of the system and usually needs to be replaced halfway through the lifespan of the panels (after 10-12 years). This cost should be planned for.
• Regulatory risk: Although Law 14.300 has brought security, abrupt changes in the taxation of components or in the valuation of energy credits can alter the profit margin.

Legal, regulatory and incentive aspects

A Law 14.300 / 2022 (The Legal Framework for Distributed Generation) changed the rules of the game. Now, new systems pay progressively for the use of utility company wire (Wire B) about the energy injected into the grid.

• Does this make the investment unfeasible? No. It only adjusted the payback period by a few months. The system remains extremely advantageous.
• Tax incentives: Solar equipment benefits from ICMS tax exemption in several states and IPI tax reduction, keeping the acquisition cost competitive.

Future trends and innovation

Looking to the future, investment in solar energy is becoming more sophisticated:

• energy storage in batteries (hybrid): It allows the use of solar energy at night or during blackouts, increasing independence from the utility company;
• AI in monitoring: Software that uses Artificial Intelligence to detect faults in real time and optimize generation;
• Use of LLMs: Advanced tools for complex financial feasibility analysis in seconds.

Every roof and every budget is unique. To guarantee the best return and avoid contractual pitfalls, it's essential to rely on experts.

Discover the Specialized Solar Energy Consulting Services of... Canal Solar. 

Conclusion

Investing in solar energy is a rational decision that combines environmental responsibility and financial intelligence. 

Whether paying upfront to maximize profit or financing to achieve immediate savings without initial outlay, solar technology offers one of the best rates of return on the current Brazilian market, with low risk and high durability.

To stay informed about changes and advancements in the solar energy market, Follow the main news here on Canal Solar.