A capacitor assembly comprises a capacitor housing wherein a relatively larger main capacitor and at least one relatively smaller secondary capacitor can be enclosed and include an efficient and simple combination of electrical connections from the multiple capacitors to an external electrical connection interface. Another aspect includes a capacitor housing wherein volumetric efficiency is enhanced by the arrangement of the multi-capacitors within a given volume of a cavity of the housing. For a given size main capacitor and one or more secondary capacitors, the total volume of space occupied by those capacitors and the housing is minimized to take up minimum room in an electrical box.