Energy Balance and Energy Ratio

The terms "energy balance" and "energy payback ratio", or "energy ratio", are used to describe system energy output related to system energy input.

Energy Balance Formula

dE = Eo - Ei

Where:

• dE = energy balance
• Eo = energy output
• Ei = energy input

Energy Ratio Formula

ER = Eo / Ei

Where:

• ER = energy ratio
• Eo = energy output
• Ei = energy input