# US 12,763,598 B2 · Load shed system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,763,598 B2 - Document ID: US12763598B2 - Status: Granted - Kind: B2 - Application number: 18/886,777 - Filed: 2024-09-16 - Published: 2025-03-13 - Granted: 2026-10-13 - Earliest claimed: 2015-01-09 - Assignees: Generac Power Systems, Inc. - Applicants: Generac Power Systems, Inc. - Inventors: Brendan Pancheri; Greg Wischstadt; Robert Iles; Andy Phillips; Taesik Yu; Sungmin Lee - Web page: https://patentgrep.com/patent/US12763598B2 ## CPC - H02J 9/061: {for DC powered loads} - G01R 11/04: Housings; Supporting racks; Arrangements of terminals - G01R 11/06: Magnetic circuits of induction meters - H02J 3/14: by switching loads on to, or off from, the networks, e.g. progressively balanced loading - H02J 2105/42: Home appliances - Y02B 70/30: Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level - Y02B 70/3225: Demand response systems, e.g. load shedding, peak shaving - Y04S 20/222: Demand response systems, e.g. load shedding, peak shaving - Y04S 20/248: UPS systems or standby or emergency generators - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS - Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS ## Abstract A load shed module configured to be connected in series between a power supply and a load is disclosed. A separate load shed module is connected in series between each load and the power supply. The load shed module determines the frequency of the voltage supplied from the power supply. Based on the frequency, the load shed module determines if utility power is connected or if a generator is connected. If the generator is connected and the frequency of the voltage goes outside of a desired operating range for a preset time, the load shed module disconnects the load from the power supply. Each load shed module includes a priority setting and reconnects its corresponding load after a predetermined time corresponding to the priority setting. ## Claims ### Claim 1 A load shed module configured to be connected between a power source and a load, the load shed module comprising: an input configured to receive a first electrical connection from the power source; an output configured to provide a second electrical connection for the load; a switch connected between the input and the output; a controller, the controller being operable to: determine whether the power source is a utility power source or an alternate power source as a function of the frequency of the AC voltage received at the input; and close the switch after a first delay period when the frequency of the AC voltage received at the input indicates that the power source is the alternate power source; and a housing within which the controller and the switch are housed. ### Claim 2 (depends on 1) The load shed module of claim 1, wherein the controller is further operable to open the switch when the frequency of the AC voltage received at the input from the alternate power source is below a frequency threshold. ### Claim 3 (depends on 1) The load shed module of claim 1, further comprising a power section connected to the input. ### Claim 4 (depends on 1) The load shed module of claim 1, wherein upon closing the switch after the first delay period, the controller is further operable to open the switch if the frequency of the AC voltage received at the input from the alternate power source is below a frequency threshold. ### Claim 5 (depends on 1) The load shed module of claim 1, wherein upon closing the switch after the first delay period, the controller is further operable to open the switch if the frequency of the AC voltage received at the input from the alternate power source is below a frequency threshold for a predefined duration. ### Claim 6 (depends on 1) The load shed module of claim 1, wherein the first delay period is a function of a priority level of the load shed module. ### Claim 7 (depends on 5) The load shed module of claim 5, wherein after opening the switch, the controller is further operable to close the switch again after a second delay period. ### Claim 8 (depends on 1) The load shed module of claim 1, wherein the power source is determined to be a backup power source if the difference between a maximum detected frequency of the AC voltage and a minimum detected frequency of the AC voltage over a predefined duration is greater than a first threshold. ### Claim 9 (depends on 1) The load shed module of claim 1, further comprising a manual lockout selector. ### Claim 10 (depends on 1) The load shed module of claim 1, wherein the load shed module does not include signal wires connected to the load shed module. ### Claim 11 A method of connecting a load to a power source in a power distribution system comprising the steps of: receiving a first electrical connection at an input of a load shed module from the power source; determining, using a controller of the load shed module, whether the power source is a utility power source or an alternate power source as a function of the frequency of the AC voltage received at the input; and closing a switch in the load shed module after a first delay period when the frequency of the AC voltage received at the input indicates that the power source is the alternate power source. ### Claim 12 (depends on 11) The method of claim 11, further comprising opening the switch when the frequency of the AC voltage received at the input from the alternate power source is below a frequency threshold. ### Claim 13 (depends on 11) The method of claim 11, further comprising selecting a priority level of the load shed module. ### Claim 14 (depends on 13) The method of claim 13, wherein the first delay period is a function of the priority level of the load shed module. ### Claim 15 (depends on 11) The method of claim 11, wherein upon closing the switch after the first delay period, opening the switch if the frequency of the AC voltage received at the input from the alternate power source is below a frequency threshold. ### Claim 16 (depends on 11) The method of claim 11, wherein upon closing the switch after the first delay period, opening the switch if the frequency of the AC voltage received at the input from the alternate power source is below a frequency threshold for a predefined duration. ### Claim 17 (depends on 15) The method of claim 15, wherein after opening the switch, closing the switch again after a second delay period. ### Claim 18 (depends on 11) The method of claim 11, wherein the power source is determined to be a backup power source if the difference between a maximum detected frequency of the AC voltage and a minimum detected frequency of the AC voltage over a predefined duration is greater than a first threshold. ### Claim 19 (depends on 11) The method of claim 11, wherein the load shed module does not include signal wires connected to the load shed module. ### Claim 20 (depends on 11) The method of claim 11, wherein the load shed module further comprises a manual lockout selector.