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What is the Prime Mover Comparison?
The Prime Mover Comparison, otherwise known as Gas versus Electric,
is an interactive means of comparing the operating cost over a five year period using an Arrow Gas Engine versus an electric engine.

Prime Mover Comparison - program overview
The comparison report that is generated at the end of the program lists a five year cost comparison of an Arrow Gas Engine with the equivalent electric motor. In order to determine the electric motor equivalent of the Arrow Gas Engine you will be prompted to enter electric motor information. If you do not have this information, the program can either calculate it or provide default values based on industry averages. You will be able to override any calculated or default values as necessary. For more information about the report screens, see "Report Screens" help section.

Multi-cylinder engine versus slow-speed engine cost comparison
The VR 330 multi-cylinder engine is being introduced by Arrow Engine Company as an alternative pumping engine. The VR 330 engine is capable of producing 80 HP at continuous duty. It can replace Arrow's larger and more expensive C-Series and L-Series engines. The VR 330 engine is an excellent choice for you, if you would like to pay a much lesser up-front cost. The VR 330 lists for about $12,000.00; while the C-255 lists at about $28,000.00 and the L-795 lists for about $43,700.00. While the yearly maintenance costs of maintaining an aged VR 330 are higher than the C-255 and L-795 costs, the cost savings of buying the VR 330 will often outweigh the maintenance cost differences.

Report Screens

5-Year Cash Flow Summary report
This report displays information about the appropriate Arrow Gas Engine and the equivalent electric motor; the Arrow Gas Engine list price; electricity and gas usage/costs; a five year cash flow comparing the operating cost of the Arrow Gas Engine versus the electric motor; a savings grand total over five years; and payback in months.

5-Year Cash Flow Detail report

This report displays a yearly detailed line item cost breakdown for both the Arrow Gas Engine and the electric motor.

5-Year Operating Profit report
While similar to the 5-year cash flow detail report, this report displays a seven year amortized cost breakdown. The savings are calculated as additional operating profit over 5 years.


Local vs. Web based
There are two versions of the Prime Mover Comparison (Gas versus Electric) program available: a web based version and a downloadable version that can be used when offline. In both cases, your comparisons are reserved for you to review and modify at your leisure. When comparing systems on our web site, you will be required to enter your e-mail address so that we may retrieve your comparisons.
Disclaimer: The Prime Mover Comparison program stores your recent comparisons in a cookie located on your computer. However, Arrow Engine Company recommends that you print the program's generated reports. Arrow is not responsible for lost data.


© 2002 Arrow Engine Company • 2301 E. Independence • Tulsa, OK 74110
918-583-5711 • www.arrowengine.com