New Installation

Solar Installation ROI: How to Calculate Payback Period

ByGLOBALNET ICT

If you’re installing solar — or selling solar like you do — understanding Return on Investment (ROI) and Payback Period is critical.

When customers ask:

“How long before this solar system pays for itself?”

You must answer confidently with numbers.

Let’s break it down step by step.

1️⃣ What Is Payback Period?

Payback Period =
How long it takes for energy savings to recover the total cost of the solar system.

In simple terms:

Total System Cost ÷ Annual Savings = Payback Period (in years)

2️⃣ Step-by-Step Calculation

Step 1: Determine Total System Cost

Include:

  • Solar panels
  • Inverter
  • Batteries (if hybrid/off-grid)
  • Mounting structure
  • Installation labor
  • Wiring & protection
  • Transportation

Example:

Total installed cost = ₦4,000,000

Step 2: Calculate Current Annual Electricity Cost

Let’s assume:

  • Monthly electricity + generator fuel cost = ₦150,000
  • Annual cost = ₦150,000 × 12

We calculate:

That equals ₦1,800,000 per year.

Step 3: Estimate Solar Savings

If solar offsets 80% of their energy usage:

Annual savings =
₦1,800,000 × 0.8

We calculate:

Annual savings = ₦1,440,000

Step 4: Calculate Payback Period

Now:

₦4,000,000 ÷ ₦1,440,000

We calculate:

That equals approximately 2.8 years.

So in less than 3 years, the system pays for itself.

After that?
It becomes profit (free electricity).

3️⃣ What About ROI?

ROI Formula:

ROI = (Annual Savings ÷ Total Cost) × 100

₦1,440,000 ÷ ₦4,000,000 × 100

We calculate:

ROI ≈ 36% per year

That’s better than most bank investments.

4️⃣ Real-Life Example

For someone in Nigeria spending heavily on:

  • PHCN bills
  • Diesel generator fuel
  • Maintenance
  • Rising fuel prices

Solar ROI improves every year because:

  • Fuel prices increase
  • Tariffs increase
  • Solar operating cost stays low

5️⃣ Important Factors That Affect Payback

  • Battery replacement cycle
  • Maintenance costs
  • Inflation & rising fuel prices
  • System degradation (usually ~0.5% per year)
  • Financing interest (if loan-funded)

6️⃣ How to Position This to Clients (Sales Angle)

Instead of saying:

“Solar is expensive.”

Say:

“You’re already paying for electricity — just in installments forever.”

Solar simply converts:

  • Endless bills
    Into
  • A 2–4 year asset investment

7️⃣ Pro Tip for You (As a Solar Professional)

When quoting clients, always prepare:

  • Load analysis
  • Current monthly energy spending
  • 5-year projection
  • 10-year savings projection

That’s how you move from installer → energy consultant.

Similar Posts