What type of power do indoor irrigation controllers typically use?

• A. Solar power
• B. Internal hard-wired power
• C. External plug-in power
• D. Rechargeable battery power

Answer: (C)

Indoor irrigation controllers typically use external plug-in power. This choice is correct because most indoor irrigation systems are designed to be connected to a standard electrical outlet, allowing for a steady and reliable power source to operate the controller's various functions. These may include timing, scheduling, and managing water delivery to the irrigation system efficiently.

Using external plug-in power is advantageous because it ensures that the controller can run continuously without the risk of battery depletion, which can be a concern with options like rechargeable battery power. Additionally, relying on hard-wired power connections helps to reduce the need for regular maintenance, as there’s no need to worry about replacing batteries.

Other power options, such as solar power or rechargeable batteries, are less common for indoor controllers due to the typically consistent accessibility to electrical outlets in indoor settings. In contrast, outdoor irrigation controllers might utilize solar power if they are installed in areas without easy access to electricity, but this is not the case for indoor systems. Similarly, while some outdoor or portable systems may use battery power to enhance mobility, these are not standard for indoor installations where a plugin option is readily available and practical.