☀️ SolarDecide

Solar System Calculator South Africa — Free

Calculate your exact solar system size and savings in South Africa. Free, independent solar ROI calculator with Rand pricing for homeowners and businesses.

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Showing a typical Lagos 3-bedroom home Adjust the inputs below to match your situation.

🏠 Your Appliances

900W
Qty
1
8h/day
1200W
75W
Qty
2
10h/day
60W
150W
Qty
1
6h/day
30W
9W
Qty
6
8h/day
150W
Qty
1
24h/day
150W
1200W
1500W

⚙️ System Settings

☀️ 4.5h sun

No grid supply

⛽ Monthly Fuel Spend

₦
Your Solar System

5

kVA

Inverter

500

Ah

Battery

4.0k

W

Solar Panels

Daily energy load13.6 kWh
Total peak load1,404 W
Cost Estimate
Inverter (5 kVA)₦750,000
Battery (500 Ah)₦600,000
Solar Panels (4,050 W)₦1,417,500
Installation₦150,000
Total Estimate
₦2,917,500
Using estimated price
Based on mid-range market prices. Last updated: 2026-04.Quotes vary 20-40% by brand and location
₦
Return on Investment

3.0 years

Payback period

32.9%

Annual ROI

Monthly fuel spend₦80,000
5-year net savings₦1,882,500
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