SpecSizer Reaches 10,000 Registered Users

by Visitor bakersj on ‎01-22-2013 01:26 PM



It didn’t come in with all the fanfare of the new year, but January 8, 2013 marked the day we welcomed the 10,000th registered user of Caterpillar’s Electric Power SpecSizer tool. Considering that Caterpillar’s first generator set sizing software program was released in the mid-1980s, this may not seem like a big deal. However, we only began registering users in 2010, so this demonstrates a substantial increase (about 250 new users every month) in registered SpecSizer users.


In recognition of our 10,000 registered users, I’d like to review why SpecSizer has become a critical tool for generator set sizing among consulting and specifying engineers, generator set installers and users all over the world.


What is SpecSizer?

SpecSizer is a free, PC software tool that allows users to select the most appropriately sized diesel generator set for virtually any electric power project. Users can size for their power needs with generator sets as small as 14KW or as large as 4000KW, and the SpecSizer tool can parallel up to 25 generator sets. Users input the details of the on-site power required including voltage, load demand, load types, duty application, maximum ambient temperature, altitude, EPA emissions and more. As a result, this software tool allows users to determine a truly customized and comprehensive power solution.


SpecSizer is also equipped with features such as the 20-Step Wizard tool that uses program logic to calculate the smallest possible generator set along with the least number of load scenario steps, which provides an optimal rating and footprint that minimizes costs. SpecSizer allows users to make load step changes to any user-defined criteria on the load scenario tab to assess possible sizing results. Check out this SpecSizer sample screen for a representation of how the selection process appears.


Why is it useful?

SpecSizer takes the guesswork out of accurately sizing a generator set for specific user load qualifications and needs. A mountain of research went into providing a sizing program with accuracy, which is the number one priority. The recommendations are based upon accurate, comprehensive algorithms, data and analysis. SpecSizer’s ability to evaluate eighteen load types, including uninterruptible power systems (UPS), motors, pumps, air conditioners, elevators, lighting and others, makes it comprehensive for the generator set sizing process. It reduces time and costs with the click of a button and allows users to size and specify the smallest generator set to fit an application. Its multiple features also provide sales support information, create guide specifications and offer printable sizing reports related to the generator set as a system inclusive of transient response performance derived from actual factory tests. SpecSizer has even been translated from English into seven other languages to serve users who speak Chinese Mandarin, French, German, Italian, Portuguese, Russian and Spanish.


The SpecSizer software has revolutionized generator set sizing by simplifying the process. Not only does it include filtering processes to align the generator set selection with available options, it also provides web links and tools, such as volts/hertz optimization, percent of intermittent motors, and percent genset capacity used (EkW) to help with analytical and strategic decisions. One of the web links even provides the precise spec sheet you need for your job specification.


In addition to the generator set sizing analysis, SpecSizer provides the aforementioned guide specification in a concise, editable text document format that is dynamically linked to any program-selected or user-selected generator set. This is important because a user can produce a guide specification with Project Sizing Report and Transient Performance Report for any manually selected generator set populated on the Generator Set Selection tab. The Project Sizing Report provides engine, alternator and generator set technical data, and the Transient Performance Report provides the selected generator set’s transient response at 25% load change increments up to a full load. These reports can be distributed electronically as a single PDF file.


Is SpecSizer right for you?          

The SpecSizer tool is designed for consulting specifying engineers but can be used by anyone looking to accurately size a diesel generator set. It has been updated with technical specifications on several new Cat power systems including generator sets, Automatic Transfer Switches (ATS), Switchgear and UPS. The latest version (2.8.0) also features Olympian generator sets including both open generator sets with improved derate capability and enclosed units for regions outside North America.


The free and downloadable software is intended to simplify the generator set sizing process. By registering, PC users are able to be notified of automatic updates to the program, which is important to maintain alignment with current generator set product releases.


For more information on SpecSizer’s free software tool download, click here.


We’re interested in hearing about your experiences with generator set sizing.


  • What tools do you commonly use to spec diesel generator sets?
  • If you use SpecSizer, which functions do you find most useful?  Would you improve anything?
  • Where do you use SpecSizer, at the jobsite or back in the office?
  • How often do you use SpecSizer – daily, weekly, monthly?
  • How can we make SpecSizer better for you?
  • Would you like a Caterpillar dealer to contact you to help with your generator set sizing needs? If so, you can email specsizersupport@cat.com to reach our SpecSizer help desk.

by Administrator
on ‎03-02-2013 02:42 PM

Steve, I'm obviously biased but congratulations on 10,000 registered SpecSizer users!

by Visitor muralcr
on ‎08-01-2013 02:19 AM

dear steve


   i had a specsizer old version installed on windows 7 32 bit OS i have migrated to 64 Bit virsion can you help with latest version that can be used on windows 7 64 bit version please

by Kids Fashion
on ‎01-21-2016 03:16 AM

Wow congratz! 10,000 registered users on SpecSizer! Hope it can grow more and more till today! Keep up the good work!

by Visitor NATHAN007
on ‎07-14-2016 05:11 AM

Hi Experts


woodward LSM 2601 have i get 10vdc on speed TRM 26to28 have any experience on this fault please help





by almanaghi
on ‎08-02-2016 02:46 PM

dear, customer service

i have problem in my genset serial number -c2G10433

Engine no ; 2H200595,GENERATOR NO L6B21022- BILL OF Lading :Mscuev040349- certificate of orgin 1441.575 that t bought since 3 mouthes ago but from the first time cat agency  did mantenence by change nousal all of them later problem is seen in turbocharger that become red and so hot also there is oil cosumption - every 250- we recorded 5 litters of oil consumption then in next oil change we recorded 8 litters oil  that mean from time to time of oill change we recorded increasing in the oil consumption ahso there is fuel leaking, am sure that i will find a solution for these problems soon specialy when this genset is still under warranty.


by New member ILAYARAJA
on ‎08-20-2016 04:02 AM

Hello Friends,

                    I am Ilayaraja working as a electrical engineer in shibha al-jazeera contracting company- saudhi arabia. we purchased one caterpillar generator C18 (serial no: CAT00C18TLXK00973). I have one doubt in this battery charging alternator (Part no : 0R2698).How much ampere hour battery capacity we can install.
or can i install 150 Ampere Hour battery to start our generator.
       If i install 150 Ampere hour battery means the battery charging alternator will suffer or not. please kindly send this information to me soon as possible.
                                                 Thank you

PMG Part no : 0R2698    45A

CONSIST  REF 5N-5692  24V


by pilar martinez
on ‎09-19-2016 05:11 PM


I would like to bigin to use spacsizer

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