Devices, systems, and related methods for power conversion and management

A modular, integrated charging system for fast charging of a battery of an electric vehicle (EV), said system comprising:

• an under-ground stationary battery storage system;
• an above-ground charging station, said charging station being disposed substantially directly above said battery storage system, and including:
• a user interface;
• a bi-directional alternating current/direct current (AC/DC) power converter that is configured to receive and rectify AC power from an AC power grid into DC power;
• a high voltage (HV) direct current/direct current (DC/DC) converter;
• a high voltage (HV) DC bus configured to receive DC power from said bi-directional AC/DC power converter and from a solar photovoltaic (PV) array and to operatively connect said battery storage system and said HV DC/DC converter;
• a station charge controller that is off board said electric vehicle and regulates transfer of DC power between said HV DC/DC converter and said EV battery;
• and
• a charging system master controller that is configured to optimize and manage power flow among said AC power grid, said solar PV array, said battery storage system, and said EV battery,
• wherein the under-ground stationary battery storage system includes:
• a vault structure having walls, including at least a first pair of opposing side walls and a second pair of opposing side walls, the side walls defining an opening into an interior space in which a battery system of the under-ground stationary battery storage system is stored, the second pair of opposing side walls disposed on a front side and rear side of the charging system, respectively, and
• a cover assembly, the cover assembly is configured to be disposed atop the vault structure and to cover at least a portion of the opening,
• wherein the vault structure and the cover assembly of the under-ground stationary battery system are configured to provide structural support to the above-ground charging station that is disposed substantially directly above the under-ground battery storage system.