---
title: "Solar Savings Calculator (PV) | GESPA Energy"
description: "Free solar calculator: system size, annual yield, savings, payback period and CO₂ reduction from your bill, consumption or roof area."
canonical: https://www.gespaenerji.com/en/hesaplayici.html
lang: en
dateModified: 2026-09-30
publisher: "GESPA Enerji"
---

[Home](https://www.gespaenerji.com/en/) / Calculator

# 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.
- What do kWp, specific yield, self-consumption and payback period mean? [Solar Glossary →](https://www.gespaenerji.com/en/sozluk.html#kwp)

## 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) —

[Request a free quote with these results](https://www.gespaenerji.com/en/iletisim.html)
[📲 Send results via WhatsApp](#)

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)

Obstacle — from top (m)

Obstacle width (m)

Obstacle height (m)

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) —

[📲 Send the active tool's result via WhatsApp](#)

Frequently Asked Questions

## About the calculation

### How is the cost of a solar plant calculated?

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.

### How accurate are the calculator results?

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

### How many panels and how much roof area does 1 kWp require?

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.

### How is the payback period calculated?

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.

Would you like to size each appliance and **select products for an order** with selected products? [Sistem Kurucu'yu deneyin →](https://www.gespaenerji.com/en/sistem-kur.html)

## Exact figures with a free survey

Our team inspects your site and prepares a firm quote.

[Request a Survey](https://www.gespaenerji.com/en/iletisim.html)

---
Kaynak sayfa: https://www.gespaenerji.com/en/hesaplayici.html · GESPA Enerji · 0543 743 42 09 · info@gespaenerji.com · Örnek Mah. 1551 Sok. Yaşar Apt. No:10 İç Kapı No: Z01, Manavgat / Antalya
Tüm sayfalar ve ürünler: https://www.gespaenerji.com/llms.txt · Ayrıntı: https://www.gespaenerji.com/llms-full.txt