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Solar Savings Calculator

Find your system size, annual savings, payback time and 25-year gain in seconds — based on your bill, consumption or roof area.

Monthly electricity bill (₺)

Monthly consumption (kWh)

Usable roof area (m²)

Irrigation pump power (kW)

Daily operation (hours)

Irrigation season (months)

Region (irradiation)

Electricity unit price (₺/kWh)

Roof orientation / tilt

Annual electricity price rise (%)

Self-consumption ratio (%) — self-use, rest to grid

Add battery / storage (increases self-use)

Assumptions

Panel power: 550 Wp · ~6 m²/kWp alan
Tahmini kurulum maliyeti: ₺28.000/kWp
CO₂ factor: 0,45 kg/kWh
Results are estimates; exact figures set during a site survey.

Estimated Results

Values update live with your inputs.

Recommended system—

Panel count (550 W)—

Required roof area—

Annual production—

Avg. monthly production—

Payback time—

Annual savings (year 1)—

Monthly savings—

Estimated investment—

25-year gain—

25-year net (gain − investment)—

Return on investment (ROI)—

CO₂ saved / year—

CO₂ over 25 years—

Tree equivalent / year—

Car-km equivalent (25 yrs)—

Battery (optional)—

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Engineering Tools

Solar Toolbox

Practical calculators for pre-design and field work. Results are estimates; exact values are set during engineering.

Panel Layout Planner

Roof width (m)

Roof depth (m)

Panel orientation

Edge setback (m)

Gap between panels (m)

Add obstacle (chimney / skylight)

Panels that fit—

Layout (cols × rows)—

Total power—

Used area—

Roof coverage—

Est. annual yield—

Inverter Sizing

System size (kWp)

Target DC/AC ratio

A DC/AC ratio of 1.1–1.3 is typical; a higher ratio performs better in low irradiance but clips at peak.

Recommended inverter—

Suitable range—

Panel count (550 W)—

Selected DC/AC—

DC Cable Size / Voltage Drop

Current (A)

Voltage (V)

Cable length — one way (m)

Voltage drop = 2 × I × L × ρ ÷ S. Target: ≤ . Includes both directions (2×).

Recommended section—

Battery / Storage Sizing

Daily consumption (kWh)

Autonomy (days)

Depth of discharge — DoD (%)

Required capacity = (daily × days) ÷ (DoD × system efficiency). For LiFePO4, DoD is ~90%.

Energy to cover—

Required battery—

Est. battery cost—

Row Spacing / Shading

Panel tilt (°)

Latitude (°)

Module length — along tilt (m)

Shade-free minimum row spacing based on winter-solstice noon sun. Sun elevation α = 90° − latitude − 23.45°.

Noon sun elevation (α)—

Row gap—

Row pitch—

Ground coverage (GCR)—

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Frequently Asked Questions

About the calculation

Installation cost is proportional to system size (kWp): the calculator uses the current estimated cost per kWp and adds storage cost if a battery is selected. The exact price is finalized after a free site survey.

Results are estimates based on realistic assumptions including regional yield, roof orientation and panel degradation; exact values are determined by site survey and engineering.

It depends on panel wattage: the calculator uses the default panel power and approximate roof area per kWp shown in the Assumptions box; panel count and required area appear automatically on the result card.

Savings from annual production are accumulated year by year with panel degradation and an electricity price scenario; the year cumulative savings exceed the investment is the payback period. In Türkiye it is typically 3–6 years.

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Exact figures with a free survey

Our team inspects your site and prepares a firm quote.

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