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Training course on energy efficiency in SMEs - engine-sme.eu

Training course on energy efficiency in SMEs - engine-sme.eu

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Compar<strong>in</strong>g <strong>in</strong>vestment and<br />

runn<strong>in</strong>g costs<br />

To visualise the importance of high <strong>efficiency</strong> motors the<br />

<strong>energy</strong> manager should be able to show the costs for<br />

electricity compared to <strong>in</strong>vestment costs.<br />

The follow<strong>in</strong>g figures and formulas are needed for this<br />

calculati<strong>on</strong>.<br />

Purchase cost:<br />

Motor size:<br />

Motor <strong>efficiency</strong>:<br />

Annual run time:<br />

Average cost of electricity:<br />

Motor operat<strong>in</strong>g at full load:<br />

www.eng<strong>in</strong>e-<strong>sme</strong>.<strong>eu</strong><br />

Annual run costs:<br />

motor cost<br />

Run time = annual run cost

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