Battery storage power stations use rechargeable batteries for load-leveling (storing electric energy at times of low demand for use during peak periods) and for renewable energy uses (such as storing power generated from photovoltaic arrays during the day to be used at night).
Definition of dray. : a vehicle used to haul goods; especially : a strong cart or wagon without sides.
Definition of assay. 1  1 : examination and determination as to characteristics (such as weight, measure, or quality) 2  2 : analysis (as of an ore or drug) to determine the presence, absence, or quantity of one or more components; also : a test used in this analysis. 3  3 : a substance to be assayed; also : the tabulated result of assaying.