재다 - 셀프 인테리어 자재 계산 도구

Solar Power Calculator

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  • To maximize power generation efficiency, the standard construction criteria at the site is to arrange the panels facing due south and maintain an installation angle of 25 to 30 degrees, in accordance with the latitude of the country.
  • 'Shade' caused by surrounding buildings or trees is a critical factor that drastically reduces the output of the entire system even if only a single panel is obscured, so be sure to check before installation.
  • To minimize error, the average sunshine duration should be entered based on the 'effective power generation time' (domestic average of about 3.6 hours], during which the panel can generate maximum output, rather than simply the time the sun is up.
  • The calculation results reflect a system loss rate (usually 15–20%] due to dust accumulation or reduced inverter efficiency, and slight differences may occur depending on actual weather conditions and equipment performance.
  • Please note that apartment veranda-type mini solar panels have limited angle adjustment and sunlight access compared to rooftop-mounted types, so the actual power generation efficiency may be lower than that of a typical rooftop installation, ranging from 60% to 70%.

How about this calculator?

Solar Power Calculator, Installation Capacity and Electricity Bill Savings Analysis

How much will my electricity bill decrease if I install solar panels on my rooftop? The efficiency of solar power generation varies significantly depending on the installation area and sunlight intensity. It is important to calculate the optimal capacity suitable for your available space. If you input the available installation area and panel specifications, this calculator analyzes the estimated installation capacity (kW], monthly power generation (kWh], and monthly electricity bill savings.

Detailed Guide to Calculator Input Items

Please enter installation environment data for accurate profitability analysis.

1. Installation area (Width × Length]

Enter the actual available area of ​​the rooftop, roof, or yard where the panels will be installed. Exclude shaded areas or areas with structures.

2. Panel Types

Standard 400W panels are high-efficiency monocrystalline panels for residential use, while 500W or higher are mainly used for commercial purposes or large areas.

3. Average sunshine hours

The average for South Korea is approximately 3.6 hours, and it is set to 4.0 hours or more on clear days and less than 2.0 hours on cloudy days.

4. System Loss Rate

Typically, 15% to 20% is applied to the power lost due to dust, inverter efficiency, etc.

Solar power generation calculation formula

The estimated power generation is calculated by multiplying the system capacity and efficiency.

System Capacity
Installation Capacity (kW] = (Number of Installable Panels × Individual Panel Capacity (W]] ÷ 1000

The size of one panel is usually arranged to be about 1.7㎡ to 2.0㎡.

Monthly power generation and estimated savings
Power Generation (kWh] = Installed Capacity × Sunshine Hours × 30 Days × (1 - Loss Rate] / Savings (KRW] = Monthly Power Generation × Electricity Unit Price

Guide to Features by Panel Type

division Standard panel (400W class] High-output panel (500W class] Double-sided panel
use Household housing commercial power plants Utilizing floor reflections
size Approximately 1.7m x 1.0m Approximately 2.2m x 1.1m Development in both the front and the back
efficiency Approximately 19~21% About 21% or more Rear additional development

Essential Checklist for Fail-Free Construction

To maximize efficiency, please check the following points.

  • Due South and the 30-Degree Rule

    Due to the latitude characteristics of Korea, the installation must be set at a tilt of 25 to 30 degrees to obtain a consistent amount of power generation.

  • Deadly enemy, shadow

    Since the output of all connected panels decreases even if only one panel is shaded, you must select a location without shadows.

  • Secure maintenance access

    It must be designed to leave a passage of at least 50 cm between the rows of panels for cleaning or repair.

Frequently Asked Questions (FAQ]

  • Q. What is the meaning of an average sunshine duration of 3.6 hours?
  • A. This figure is calculated based on the effective power generation time during which the panel can produce maximum output, rather than the time the sun is up.
  • Q. Does power generation work even on rainy or cloudy days?
  • A. Power generation occurs, but drops to between 10% and 30% of the level on clear days. Since it is based on annual average data, the annual total is similar.
  • Q. Can I install it on an apartment balcony as well?
  • A. Mini solar panels can be installed, but their efficiency is only 60% to 70% of that of rooftop solar panels. They are suitable for reducing progressive electricity tariffs.