Dog
The domestic dog served security functions for millennia before electronic alternatives existed. Even small dogs provide auditory deterrence through barking that studies indicate deters 34 percent of potential intruders before entry attempts occur. Larger breeds offer physical deterrence that home insurance actuaries factor into premium calculations.
Dogs patrol perimeters, investigate disturbances, and alert to anomalies with a vigilance no electronic system matches. They do not require passwords, suffer no software vulnerabilities, and cannot be defeated by cutting power cables. Their security contribution operates 24 hours daily, including periods when their owners believe them to be sleeping.
Solar Panel
Solar panels contribute to household security primarily through economic resilience. Homes with solar installations reduce dependence on external energy infrastructure, maintaining function during grid failures that leave neighbours in darkness. Battery-paired systems can operate essential services for days without external power.
However, solar panels cannot bark at suspicious individuals. They cannot investigate strange sounds. They present no deterrent to anyone who does not fear renewable energy on principle. Their security contribution is entirely passive and economic rather than physical.
VERDICT
A dog will position itself between its owner and perceived threats. A solar panel will continue generating electricity with complete neutrality regardless of who enters the property.