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YRS 100 HOURS 200 HOURS 300 HOURS 400 HOURS
0 407.0 K$ 407.0 K$ 407.0 K$ 407.0 K$
1 554.3K$ 617.3 K$ 680.3 K$ 743.3K$
2 701.6K$ 827.6K$ 953.6K$ 1079.6K$
3 848.9 K$ 1037.9 K$ 1226.9 K$ 1415.9 K$
4 996.2 K$ 1248.2 K$ 1500.2 K$ 1752.2 K$
5 1143.5K$ 1458.2 K$ 1773.0 K$ 2088.5 K$

OPTION B. 1200 KVA SYSTEMas designed in Option on, every hour of usage further reduces the total cost of
A, to provide power to critical and essential services. In owning an EVR. If the diesel runtime is reduced by 300
Option B, however, an EVR has been installed between hours annually, the payback period is reduced to 1.2 years.
the utility system and the load to reduce reliance on diesel At 400 hours, the payback period is just under 1 year.
generation during brownouts and to mitigate the sags and
surges that would otherwise trigger the backup system.
When Option B is utilized, the generator will not need to
run until the system voltage reaches 75%—considerably
less than in Option A. Were we to go further and factor
in residual losses caused by power-related business
disruptions, ownership costs would be further reduced.

Initial Cost:

Generator $320,000
UPS $87,000
EVR $240,000
Total $647,000

Yearly running cost:

Once again, the cost of a diesel generator running at ¾
load is estimated at $630/hour. This figure assumes that
diesel fuel costs a conservative $10/gallon and .07 G/
KWH). The annual cost for UPS maintenance, battery
replacement and cost of losses is estimated at $21,300
per year. CONCLUSION
An EVR is the Third Component of Effective and Affordable
YRS TOTAL COST Power Mitigation

0 647.0 K$ For many years, diesel generators, in combination with
1 735.1 K$ UPS systems, were the standard solution for outages,
2 823.2 K$ voltage sags and brownouts. But as we have seen, these
3 911.3 K$ devices provide only a partial solution, and at considerable
4 999.4 K$ and often unpredictable levels of risk and expense.
5 1087.5 K$
This paper explored the compelling financial analysis used
PAYBACK by more and more hospitality industry decision makers
Figure A. Comparison of diesel generator plus UPS, (Option when adding an EVR as the third component of their power
A), and diesel generator with UPS and EVR (Option B). conditioning system. A hard analysis of total ownership
This figure demonstrates payback period based upon the costs shows that the EVR helps other mitigation tools
required hours of diesel backup due to sags. At 200 hours (UPS systems and generators) operate more efficiently
of annual diesel runtime to address voltage brownouts, and effectively. Those who invest in EVRs quickly realize
an EVR pays for itself in under 2 years. From that point a return on investment and benefit from fuel-cost savings
INDUSTRY JOURNAL 22