Net present value
—
25-year discounted return
SOLAR INVESTMENT INTELLIGENCE
What if your roof
paid for itself?
Estimate your solar savings with an hourly Saudi weather model, realistic household demand and transparent long-term economics.
Preparing your solar analysis…
SOLAR DESIGN
Customize your solar system
Adjust the system parameters and compare the results below.
Live array orientation preview
Updates with tilt and orientation sliders
Fixed shade loss3%
Project life25 years
Discount rate6.5%
Discounted payback
—
6.5% real discount rate
Annual savings
—
Year 1 · bill savings + exports
PV system size
—
Grid-connected, no battery
Solar used on-site
—
Share of solar production
Solar exported
—
Share of solar production
HOURLY ENERGY PROFILE
Your home's daily load curve
Reference summer and winter demand shapes, scaled to your entered monthly kWh
Weekday demandWeekend demand
Hourly solar production vs. demand
Same 0 kW baseline for a fair visual comparison
Weekday demandPV output
PRODUCTION & CONSUMPTION
Annual energy balance
Monthly solar energy used or exported
Self-consumedExportedImported
INVESTMENT SNAPSHOT
Economics at a glance
Assumptions and the economics of your system
Initial investment—
Annual solar energy—
Solar self-consumption—
Annual exports—
Lifetime ROI—
Levelized cost (LCOE)—
Update your inputs to explore the economics.
THREE-PHASE GRID CONNECTION
230 / 400 V · 3ΦHow your rooftop solar works
PV connects through a dedicated AC breaker on the load side of the three-phase service panel
25-YEAR FINANCIAL OUTLOOK
Your investment over time
Yearly net cash flow and cumulative discounted return
Annual net cashflowCumulative discounted return
View year-by-year cash flow 25 years
| Year | PV kWh | Energy savings | Export credit | Net cash flow | Discounted CF | Cumulative NPV |
|---|
Model assumptions & decision guidance
Tariff model: imports are charged at 0.253 SAR/kWh for the first 6,000 kWh per month and 0.3795 SAR/kWh thereafter; exported energy is credited at 0.07 SAR/kWh. Actual statements, fixed charges and settlement rules may differ.
Solar model: 8,760 hourly observations, Perez tilted-plane model, temperature correction, 3% shading loss, 0.95 DC factor, 0.88 system efficiency and inverter clipping at DC/AC 1.2.
Financial model: 25-year horizon, 6.5% discount rate, 0.7% annual solar module degradation, and long-term lifecycle costs included in the net return. Tariffs and consumption are held constant in real terms.
Load model: estimated hourly demand derived from your 12 monthly values and the provided typical weekday/weekend summer/winter curves; summer A/C represents 75% of the modeled summer demand. Not a measured smart-meter curve.
Legal notice: This calculator is an indicative decision-guidance tool, not an engineering design, investment guarantee, official utility quotation, tax opinion, or assurance of regulatory eligibility. Results depend on assumptions and historical observations. Obtain a site survey, shading assessment, structural and electrical design, current tariff confirmation, and approval from the relevant utility and qualified professionals before investment or interconnection.