kWからアンペア計算機 ロゴ
kWからアンペア計算機
☀️ ソーラーパネルサイジング

ソーラーパネル アレイ サイジング

特定の1日のエネルギーニーズを満たすために必要な太陽光発電パネルの総数を求めます。

消費データ

パネルアレイサイジング

kWh/日
時間/日
効率を考慮済み

この計算には、インバーター変換、配線抵抗、温度変化を考慮した標準的な1.25の損失係数（25％）が含まれています。

必要パネル枚数
—
枚
入力待ち
— kW
— Wh

サイジング計算式

パネルの枚数は、エネルギー需要、利用可能な日照量、各パネルのワット数によって決まります。

必要アレイ出力
kW = (Daily kWh ÷ Sun Hours) × 1.25

1.25の損失係数は、実際の出力を低下させる熱によるディレーティング、配線抵抗、インバーター変換損失をカバーします。

パネル枚数
Panels = ⌈(kW × 1000) ÷ Panel Watts⌉

常に次の整数に切り上げてください。パネルの端数は電力を生み出しません。

How to Size a Solar Panel Array

Sizing a solar panel array correctly ensures your system produces enough electricity every day without overspending on excess capacity. The three core variables are daily energy consumption (kWh), peak sun hours at your location, and the wattage rating of each panel.

What Are Peak Sun Hours?

A peak sun hour equals one hour of sunlight at 1,000 W/m² intensity. Most US locations average 4–6 peak sun hours daily. Northern and coastal areas typically see 3.5–4 hours, while the desert Southwest can exceed 6. Always use local solar irradiance data for the most accurate sizing.

Step-by-Step Sizing Guide

  1. Measure Your Daily Usage: Check your electricity bill for monthly kWh and divide by 30. Add 15–20% buffer if you plan to add appliances later.
  2. Find Your Peak Sun Hours: Look up your location's solar resource data. The default of 4.5 hours is a safe conservative estimate for most temperate regions.
  3. Choose a Panel Wattage: Modern residential panels range from 300W to 450W. Higher-wattage panels reduce the number of panels needed for the same output.
  4. Apply the Loss Factor: Multiply your raw requirement by 1.25. Real-world systems consistently produce less than their rated capacity due to heat, shading, and conversion losses.
  5. Round Up the Count: Always round the panel count up to the next whole number to guarantee you meet your energy target.

Common Sizing Mistakes to Avoid

  • Ignoring seasonal variation: Size for your worst month (typically December for northern climates), not the annual average.
  • Skipping the loss factor: A 1:1 system will under-produce on hot days, cloudy periods, and as panels age.
  • Using nameplate wattage alone: Panel output degrades 0.5–0.8% per year. Build in headroom for long-term performance.