ENERCALC SEL is offered for download and installation for evaluation purposes. This software is only limited by timed popup sales messages, printout watermarks, some fixed input parameters and a 60 day usage limit. With the Evaluation Version you can start using the software on one of your projects and see how it can benefit your personal engineering productivity! When you find things going well you can purchase a license and your calculations can still be used! You can Click Here to download an Evaluation version.