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Battery storage systems store energy for later use, enabling renewable energy reliability. Capacity, power rating, and round-trip efficiency matter.

ステップバイステップガイド

  1. 1Energy capacity (kWh): total storable energy
  2. 2Power rating (kW): maximum charge/discharge rate
  3. 3Round-trip efficiency: (energy out / energy in) typically 80-95%

解いた例

入力
10 kWh battery, 5 kW power, 90% efficiency
結果
Stores 10 hours full discharge or 2 hours at 5 kW, loses ~1 kWh round-trip
Typical battery performance

避けるべきよくある間違い

  • Neglecting efficiency losses in energy balance
  • Over-sizing battery (unnecessary cost)

よくある質問

Why do batteries lose efficiency?

Internal resistance generates heat during charge/discharge cycles; chemistry determines losses.

How long do batteries last?

Lithium-ion: 10-15 years, 2000-5000 cycles. Degradation accelerates with age and temperature.

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