*Calculations based on a 14KVA generator in an area with limited available power.
|Cell Tower Operational Cost Savings Argument
per Stealth Power Unit
|Fuel usage (Ltrs)/year without SP system||27,372||Fuel cost (diesel per liter)||$1.10|
|Fuel usage (Ltrs)/year SP system||13,686||SP system cost to HBC||$22,770|
|Annual fuel cost without SP system||$30,110||Local partner mark-up||50%|
|Annual fuel cost with SP system||$15,055||Local partner unit sales price||$34,155|
|Annual cost saving with SP system||$15,955||Cost of replacement equipment||$11,350|
|Repayment period (mos.) for customer||18.18||Assumptions Fuel usage assumptions|
|Repayment period in operational hours||9,958||14 KVA Generator diesel Fuel usage/hour||4,164|
|Cost savings per operational hour||$2.29||Fuel usage using SP system||50%|
|Percentage of hours in operation||75%|
|Total hours of operation||6,574|
Costs depend on generator size and significance of energy cost differentials during day/night.
In locations that have difficulty accessing power, the power/utility provides a tiered rate structure for using power off‐peak rather than during peak hours.
This load shifting can be as high as 25% of the difference between peak vs. off peak usage. In India, for example, the price difference in an energy unit can be as much as 22.5% if non‐peak hours are utilized. This is a guaranteed savings available every day as the load shifting discount is applied at least 5 days a week. In a test case, we used a 78,000 sq. ft., class A office space which was being utilized at 50%. The system reduced the need for a second generator, reduced fuel consumption by 75% and provided a reduction of power costs by 32%. The system cost was recouped within 9 months and the continued cost savings went directly to the owner’s bottom line.
|Generator Size||1/4||1/2||3/4||Full Load|
|3Kw/H||0.02 gal/hr||0.04 gal/hr||0.05 gal/hr||0.07 gal/hr|
|5Kw/H||0.04 gal/hr||0.06 gal/hr||0.09 gal/hr||0.11 gal/hr|
|10Kw/H||0.09 gal/hr||0.13 gal/hr||0.18 gal/hr||0.23 gal/hr|
|15Kw/H||0.14 gal/hr||0.21 gal/hr||0.28 gal/hr||0.36 gal/hr|
|20Kw/H||0.2 gal/hr||0.29 gal/hr||0.39 gal/hr||0.5 gal/hr|
|30Kw/H||0.35 gal/hr||0.48 gal/hr||0.63 gal/hr||0.79 gal/hr|
|40Kw/H||0.49 gal/hr||0.67 gal/hr||0.87 gal/hr||1.09 gal/hr|
|50Kw/H||0.6 gal/hr||0.83 gal/hr||1.07 gal/hr||1.34 gal/hr|