A telecommunication system incorporates a vanadium redox battery energy storage system. The vanadium redox battery energy storage system receives and is charged by DC power. Upon power interruption, telecommunication equipment relies on the vanadium redox battery energy storage system to receive DC power. A charger/rectifier monitors received AC power to determine if an AC power interruption is occurring and initiates DC power transmission from the vanadium redox battery energy storage system to the telecommunication equipment.