1. Panel Efficiency: Assumed 18% (average for modern residential panels)
2. Usable Roof Area: Assumed 70% of total roof area due to shading, obstructions, and spacing
3. Peak Sun Hours (Dubai): Assumed 5.5 hours/day (average daily sunlight equivalent to 1000 W/m² radiation)
4. System Losses: Assumed 20% losses (due to temperature, wiring, inverter efficiency, dust)
5. Battery Size: Based on estimated daily generation or your entered daily consumption, aiming for 100% daily energy coverage
6. Estimated Consumption: Based on 5 kWh/day per bedroom, plus specific values for selected appliances
7. Typical Panel Dimensions: Assumed 1.7 meters x 1.0 meter (approximately 1.7 m² per panel)
8. Inverter Efficiency: Based on selected inverter type
9. Estimated Electricity Prices and Savings Methodology:
- a. Estimated Electricity Prices: Assumed £0.28 / AED 0.45 per kWh (average residential prices)
- b. Cost Savings Methodology: This method calculates the amount you won't have to pay for grid electricity because your solar system generates that electricity for you. It is derived by multiplying "Total Annual Energy Generated (kWh/year)" by "Estimated Electricity Price (£/kWh or AED/kWh)". This assumes all generated energy offsets consumption or is credited via a net metering system
- c. Annual Maintenance Cost: If enabled, an annual maintenance cost (typically 1-2% of the total system cost) is deducted from the total annual savings to determine net savings
- d. Simple Payback Period Methodology: This estimates the time it takes to recover your initial investment in a solar system through "net" annual cost savings. It is calculated by dividing "Estimated Total Cost (Panels, Inverter, Battery, Installation)" by "Estimated Net Annual Savings"
These figures are based on current assumptions and do not account for future electricity price fluctuations, inflation, or other complex financial factors for a more detailed analysis.
10. Estimated Costs: Based on selected equipment and approximate market prices for:
- Solar Panels: Varies by selected type
- Inverter: Varies by selected type
- Battery: £300 / AED 1400 per kWh
- Installation & Soft Costs: £1000 / AED 4500 (covers labor, installation, wiring, permits, etc.)
These are approximate estimates and may vary significantly based on brand, quality, location, and specific installation requirements.
11. CO₂ Emissions: 0.233 kg CO₂ per kWh from grid electricity
12. Disclaimer: This is an estimation tool. For precise sizing, accurate costing, and professional advice, please consult a certified solar energy expert.
