1. A method of characterizing an electrical device comprising: a. measuring an aggregated waveform from a building electrical circuit, the aggregated waveform resulting from current flow on the building electrical circuit through one or more device connected to the building electrical circuit; b. determining a representative wavelet model from the aggregated waveform; c. communicating the representative wavelet model over a network to a server; d. creating a combined predictive model by combining two or more known waveform signatures, each known waveform signature obtained from a known electrical device; e. comparing at the server the combined predictive model to the communicated representative wavelet model; and f. characterizing at least one of the one or more electrical devices connected to the building electrical circuit when the compared combined predictive model and the representative wavelet model match.