Smart load management apparatus and system for houses and buildings with solar system installations
A solar system installed at a house or building, which may include solar panels and a solar inverter. When the solar system is installed at the house or building, the power load associated with the solar system might overload an electrical panel. This might force the owner of the house or building to spend thousands of dollars on an electrical panel upgrade. To avoid such an expensive upgrade, a smart load manager (SLM) is disclosed that can communicate with the solar inverter and can control it. The SLM can function as a real-time load shedding device, thereby avoiding the cost of a load center/panel upgrade, while enabling a safe and cost-effective solar system installation.
1. A smart load manager apparatus, the apparatus comprising:
a power measurement unit configured to measure an active power load value being drawn over an electrical line, wherein the power measurement unit is configured to measure the active power load value at a location between an electrical meter of at least one of a house or a building, and an electric utility provider; and
a real-time power management logic section configured to periodically calculate at least one of a house-wide available power value or a building-wide available power value dependent on the active power load value, wherein:
the real-time power management logic section is configured to cause to be stored a maximum installed power load value for the at least one of the house or the building;
the real-time power management logic section is configured to determine the at least one of the house-wide available power value or the building-wide available power value by subtracting the active power load value from the maximum installed power load value;
the real-time power management logic section is configured to control a plurality of power loads associated with the at least one of the house or the building;
in an uncontrolled state, instantaneous power associated with the plurality of power loads exceeds the capacity of at least one electrical panel associated with the at least one of the house or the building; and
in a controlled state, the real-time power management logic section is configured to control the plurality of power loads associated with the at least one of the house or the building such that the instantaneous power associated with the plurality of power loads does not exceed the capacity of the at least one electrical panel associated with the at least one of the house or the building.
2. The smart load manager apparatus of claim 1 , wherein the real-time power management logic section is configured to control the plurality of power loads associated with the at least one of the house or the building such that the instantaneous power associated with the plurality of power loads does not exceed the at least one of the house-wide available power value or the building-wide available power value.
3. The smart load manager apparatus of claim 1 , wherein the real-time power management logic section is configured to control the plurality of power loads associated with the at least one of the house or the building such that the instantaneous power associated with the plurality of power loads does not exceed a capacity of any single electrical panel associated with the at least one of the house or the building.
4. The smart load manager apparatus of claim 1 , wherein:
the real-time power management logic section is configured to control the plurality of power loads associated with the at least one of the house or the building;
the smart load manager apparatus further comprises a communication unit configured to communicate with a solar inverter;
the plurality of power loads includes a solar power load associated with the solar inverter; and
the real-time power management logic section is configured to control the plurality of power loads including the solar power load using the communication unit such that the instantaneous power associated with the plurality of power loads including the solar power load does not exceed the capacity of any single electrical panel associated with the at least one of the house or the building.
5. The smart load manager apparatus of claim 4 , further comprising a communication line from the communication unit of the smart load manager apparatus to the solar inverter.
6. The smart load manager apparatus of claim 1 , wherein the real-time power management logic section is configured to determine a buffer-reduced maximum installed power load value by subtracting a safety buffer value from the active power load value.
7. The smart load manager apparatus of claim 6 , wherein the real-time power management logic section is configured to determine the at least one of the house-wide available power value or the building-wide available power value by subtracting the active power load value from the buffer-reduced maximum installed power load value.
8. The smart load manager apparatus of claim 1 , wherein:
the real-time power management logic section is configured to determine an electric vehicle supply equipment (EVSE) load power value for each of one or more EVSE units; and
the real-time power management logic section is configured to control the EVSE load power value for each of the one or more EVSE units dependent on the at least one of the house-wide available power value or the building-wide available power value.
9. The smart load manager apparatus of claim 1 , wherein the real-time power management logic section is configured to monitor a charging rate of one or more EVSE units, and to cause a solar inverter and the one or more EVSE units to be power load balanced dependent on the charging rate of the one or more EVSE units.
10. A computer-implemented method for power load balancing, the method comprising:
measuring, by a power measurement unit, an active power load value being drawn over an electrical line at a location between an electrical meter of at least one of a house or a building, and an electric utility provider;
periodically calculating, by a real-time power management logic section, at least one of a house-wide available power value or a building-wide available power value dependent on the active power load value;
causing to be stored, by the real-time power management logic section, a maximum installed power load value for the at least one of the house or the building;
determining, by the real-time power management logic section, the at least one of the house-wide available power value or the building-wide available power value by subtracting the active power load value from the maximum installed power load value;
in a controlled state, controlling, by the real-time power management logic section, a plurality of power loads associated with the at least one of the house or the building, wherein in an uncontrolled state, instantaneous power associated with the plurality of power loads exceeds the capacity of at least one electrical panel associated with the at least one of the house or the building; and
in the controlled state, controlling, by the real-time power management logic section, the plurality of power loads associated with the at least one of the house or the building such that the instantaneous power associated with the plurality of power loads does not exceed the capacity of the at least one electrical panel associated with the at least one of the house or the building.
11. The method of claim 10 , further comprising controlling, by the real-time power management logic section, the plurality of power loads associated with the at least one of the house or the building such that the instantaneous power associated with the plurality of power loads does not exceed the at least one of the house-wide available power value or the building-wide available power value.
12. The method of claim 10 , further comprising controlling, by the real-time power management logic section, the plurality of power loads associated with the at least one of the house or the building such that the instantaneous power associated with the plurality of power loads does not exceed a capacity of any single electrical panel associated with the at least one of the house or the building.
13. The method of claim 10 , further comprising:
controlling, by the real-time power management logic section, the plurality of power loads associated with the at least one of the house or the building, wherein the plurality of power loads includes a solar power load associated with a solar inverter;
communicating, by a communication unit, with the solar inverter; and
controlling, by the real-time power management logic section, the plurality of power loads including the solar power load using the communication unit such that the instantaneous power associated with the plurality of power loads including the solar power load does not exceed the capacity of any single electrical panel associated with the at least one of the house or the building.
14. The method of claim 13 , further comprising communicating, by a communication line, from the communication unit of the smart load manager apparatus to the solar inverter.
15. The method of claim 10 , further comprising determining, by the real-time power management logic section, a buffer-reduced maximum installed power load value by subtracting a safety buffer value from the active power load value.
16. The method of claim 15 , further comprising determining, by the real-time power management logic section, the at least one of the house-wide available power value or the building-wide available power value by subtracting the active power load value from the buffer-reduced maximum installed power load value.
17. The method of claim 10 , further comprising:
determining, by the real-time power management logic section, an electric vehicle supply equipment (EVSE) load power value for each of one or more EVSE units; and
controlling, by the real-time power management logic section, the EVSE load power value for each of the one or more EVSE units dependent on the at least one of the house-wide available power value or the building-wide available power value.
18. The method of claim 10 , further comprising:
monitoring, by the real-time power management logic section, a charging rate of one or more EVSE units; and
causing a solar inverter and the one or more EVSE units to be power load balanced dependent on the charging rate of the one or more EVSE units.