What is the output energy of the Bear Sentry energizer?
The Bear Sentry energizer is rated at 1.8 Joules stored energy, and 1.0 Joules output energy.
Output energy is the energy of the shock actually delivered (to a bear). It depends on the resistance of the line and the quality of the ground. With 20km of line and a good ground, the energizer "output" energy is rated at 1.0 Joules.
Given that Bear Sentries have only 100m of line (more or less) and we provide a voltmeter to verify the ground, the 1.0 Joule output is more of an "at least" rating.
For more on this, see the Why Bear Sentry? page.