Calculadora de Retorno Energético Gratis
Calcula cuánto tiempo tarda un sistema renovable en devolver la energía usada en su fabricación.
Energy Payback Time
1.7 years
Energy Payback Time vs Embodied Energy (Manufacturing)
Fórmula
## How to Calculate Energy Payback Time Energy payback time (EPBT) measures how long a system must operate to produce the energy used in its manufacture. ### Formula **EPBT = Embodied Energy / Annual Production** **EROI = Lifetime Production / Embodied Energy** ### Typical Values - Solar PV: 1-3 years EPBT - Wind turbine: 0.5-1 year EPBT - Nuclear: 5-7 years EPBT - Coal plant: 1-2 years EPBT (but never net-zero CO2)
Ejemplo Resuelto
A solar system with 20 MWh embodied energy producing 12 MWh/year over a 25-year lifespan.
- 01Energy payback: 20 / 12 = 1.7 years
- 02Lifetime production: 12 * 25 = 300 MWh
- 03Net energy: 300 - 20 = 280 MWh
- 04EROI: 300 / 20 = 15x
Preguntas Frecuentes
What is energy payback time?
Energy payback time (EPBT) is the time a system must operate to generate the energy consumed during its manufacture, transport, and installation. Lower is better.
Do solar panels produce more energy than they use?
Yes, by a large margin. Modern solar panels pay back their embodied energy in 1-3 years and then produce clean energy for 22-27 more years. Their EROI is 10-20x.
What is EROI?
Energy Return on Investment is the ratio of energy produced over a lifetime to energy invested in manufacturing. An EROI above 5x is considered good for energy sources.