# Energy Balance and Energy Ratio

## Energy balance and energy payback ratio

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

The energy balance can be expressed as

E_{o}= dE + E_{i}(1)

or

dE = E_{o}- E_{i}(1b)

where

dE = energy balance

E_{o }= energy output

E_{i}= energy input

The energy ratio - system energy output to system energy input - can be expressed as

ER = E_{o}/ E_{i}(2)

where

ER = energy ratio

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