Abstract: The present invention relates to a method of managing the power requirements of an off-grid assembly, and in particular a solar powered off-grid floodlight assembly, that has one or more functional components with electrical power demands that are met by energy storage means. In a first stage the method determines the current state of charge of the energy storage means and records such. This current state of charge determined is then compared with a calculated power requirement for operating said functional components for at least one required operating period. The level of power supplied by the energy storage means to the functional components is then managed in accordance with a power rationing model that comprises instructions to vary the power supplied over time to ensure at least partial functionality of the functional components throughout the required operating period or periods.