How will the power unit be used? How many power sockets will be needed? And would the location also benefit from a supply of water or data cables? Equipping any outdoor space. The materials used to manufacture power supply units will be a major factor in how durable the unit will be and its longevity (design life). In the. For more detailed insights into specifying power units for outdoor spaces, Pop Up Power Supplies has produced a 17-minute CPD presentation which is available to view on YouTube. Finally, consider what visual impact the power supply unit could have on the site. A power bollard will be visible all the time as an integrated part of the street or outdoor furniture.