Patent Application
20170214225
In existing wiring, the power coming in from the grid passes through a utility Watt-Hour meter and proceeds to the main AC service panel. Both loads and sources are connected up to this through circuit breakers rated to the capacity of the load/source. In case the circuit breaker capacity of the panel was insufficient to meet the needs of the new loads/sources being installed, the main service panel would be replaced, or a subpanel would be added. If the wiring between the utility meter and the service panel or within the main service panel was not sufficiently rated to handle the total current including the newly interconnected loads/sources, the wiring would have to be upgraded.
Adding Solar, Storage, and EV charging to an existing home poses several challenges resulting from the fact that the electrical infrastructure in the home was not designed with these in mind. Problems include inadequate circuit breaker capacity in the main AC service panel, additional equipment required on each new branch of energy to meet code, new operational modes where a disconnection from the grid may be necessary to enable stored energy to power the home in case of a grid outage, requirement for backup power to critical loads in case of a grid outage etc. The present invention also enables new grid interactive features such as demand response, grid assist, time shifting of loads, and net export curtailment by being the nerve center of the distributed generation system.
The prior existing technology does not provide any branching. If there is power to the panel, it connects up to everything. If the panel is out of breaker capacity, you end up needing to replace it. You end up needing to add external disconnect switch/protection circuitry for each external source that is hooked up for safety. The prior existing technology also has no way of enabling a grid disconnect to facilitate islanded mode operation, either backing up the entire main service panel, or critical loads. The present invention also provides a meter socket adapter with load side interruption and terminals. This allows any control and monitoring equipment to be inserted between the utility meter and the main service panel which could otherwise be very complicated, especially in case of a combined main service panel—utility meter arrangement.
The first part of the invention describes a combined interconnect, metering, and control box that would solve all the issues mentioned above. The location of the interconnect, metering, and control box in between the utility meter and main service panel enables consumption metering, islanding for backup purposes, and supply side interconnect which eliminates the need to upgrade the main service panel.
The second part of the invention describes a utility meter socket adapter that would allow the combined interconnect, metering, and control box mentioned in the first part to be connected up without disturbing, replacing, or upgrading the existing electrical infrastructure in the home at all. The meter socket adapter allows for the interruption and exposing of terminals on the load side of the utility meter without affecting the wiring past the utility meter socket.
The current invention provides an electrical interconnect and metering box for renewables, storage and additional loads comprising: an interconnect box between a utility meter and a main service panel of a property, wherein the interconnect box intercepts the electrical connection between the main service panel and the utility meter; at least two grid electrical inputs from the utility meter are connected to the interconnect box wherein the at least two grid electrical inputs are combined to provide a combined grid stream; at least two external electrical inputs connected to the interconnect box having circuit breakers for each of the at least two electrical inputs; at least one external neutral input connected to the interconnect box; at least one shorting block used to merge together two of the at least two external electrical inputs and one of the at least one external neutral inputs to provide an external merged stream; a central computing unit receives the combined grid stream and the external merged stream and utilizes power from at least one of the combined grid stream and the external merged stream to generate power and source voltage on energy metering, wherein the combined grid stream and the external merged stream from the central computing unit are connected through an electronically controlled disconnect switch and an emergency manual AC disconnect switch to a power distribution block that ties the external merged stream into the combined grid stream and the main service panel.
The current invention also provides a meter socket adapter having; a first housing with a bottom end and a top end; the bottom end having at least two line side electrical contacts and at least two load side electrical contacts; the top end having at least two line side receiving terminals and at least two load side receiving terminals, wherein each of the at least two line side electrical contacts are directly shorted to a corresponding one of the at least two line side receiving terminals, wherein each of the at least two load side electrical contacts and the at least two load side receiving terminals are isolated from each other; wherein the electrical interconnect and metering box has a first set of in connection terminals and a second set of out connection terminals; wherein each of the at least two load side electrical contacts are directly wired to the first set of in connection terminals; wherein each of the at least two load side receiving terminals are directly wired to the second set of out connection terminals and wherein each of the first set of in connection terminals are connected to the second set of out connection terminals to complete the circuit interrupted by the meter socket adapter.
In the following section, the present disclosure will be described with reference to exemplary embodiments illustrated in the figures, in which:
In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the disclosure. However, it will be understood by those skilled in the art that the present disclosure may be practiced without these specific details. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present disclosure.
Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” or “according to one embodiment” (or other phrases having similar import) in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Also, depending on the context of discussion herein, a singular term may include its plural forms and a plural term may include its singular form. Similarly, a hyphenated term (e.g., “transformer-rated,” “WiFi”, “on-site,” etc.) may be occasionally interchangeably used with its non-hyphenated version (e.g., “transformer rated,” “WiFi”, “on site,” etc.), and a capitalized entry (e.g., “Electrical Unit,” “Operative Module,” “Electrician Zone,” etc.) may be interchangeably used with its non-capitalized version (e.g., “electrical unit”, “operative module,” “electrician zone,” etc.). Such occasional interchangeable uses shall not be considered inconsistent with each other.
It is noted at the outset that the terms “coupled,” “operatively coupled,” “connected”, “connecting,” “electrically connected,” etc., are used interchangeably herein to generally refer to the condition of being electrically/electronically connected in an operative manner. Similarly, a first entity is considered to be in “communication” with a second entity (or entities) when the first entity electrically sends and/or receives (whether through wireline or wireless means) information signals (whether containing address, data, or control information) to/from the second entity regardless of the type (analog or digital) of those signals. It is further noted that various figures (including component diagrams) shown and discussed herein are for illustrative purpose only, and are not drawn to scale.
The terms “first,” “second,” etc., as used herein, are used as labels for nouns that they precede, and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.) unless explicitly defined as such.
With reference to
The invention includes a central metering, communication, and computing unit which collects all data, communicates to the server, performs all computations as well as any control functions required. To prevent the control functions from islanding and removing power from the device, the unit shall have redundant power supplies allowing it to function from power either from the grid or from any of the sources connected up to it. The device shall also be capable of sensing whether the grid is live or not, whether or not it is powered from it. L1, L2, and N from one or more loads or sources is connected up to the box. Each L1 or L2 input is hooked up through a circuit breaker, optionally a disconnect switch, and optionally a current transformer. Neutrals are directly connected up. Past these, shorting blocks are used to merge together L1, L2, and N streams. L1 and L2 from this point are connected up to L1 and L2 from the grid through an electronically controlled disconnect switch and an emergency manual AC disconnect. In some variants, the L1 and L2 streams from loads is kept separate from the L1 and L2 streams from sources to enable independent metering of loads and sources as well as independent disconnection of loads and sources as required. This is facilitated by separate current transformers and disconnect switches/contactors on the combined load L1 and L2 as well as the combined source L1 and L2. The disconnect switches are controlled based on internal logic and rules or remotely sent commands to achieve multiple functional goals. Past the merging point of all external L1, L2, and N streams, the combined stream of external L1 and L2 are shorted to the utility incoming L1 and L2 using Power distribution/shorting blocks. Current transformers measuring the total external load/source current on L1 and L2 may be used at this point instead of or in addition to individual branch current measurements.
The power coming in from the utility meter passes through optional disconnect switches for L1 and L2 into the same power distribution blocks where it merges with the external combined L1 and L2. Past the blocks, these lines continue onto a second set of terminal blocks through current transformers on L1 and L2. L1, L2, and N are connected from this second terminal block to the main AC service panel. L1, L2, and N are tapped from the incoming utility source and connected to the central measurement, computing, control, and communication unit. A second stream of L1, L2, and N are tapped from the combined external load/source power and connected up as well.
The central unit is capable of using power from either source to generate its own power, as well as using either source for the voltage on energy metering. It will also be capable of independently monitoring both streams for presence of electrical energy delivery. In addition, all variants would also be capable of being powered from a DC backup power output from a renewable source that can be safely active even if the grid goes down (not shown in diagrams). All variants would also include communications capabilities allowing them to communicate with equipment on site that generate or consume the external source/loads as well as with an external information, control and data acquisition server. The full featured version, as depicted in
An electrical interconnect and metering box for renewables, storage and additional loads is provided having an interconnect box (100) between a utility meter (102) and a main service panel (104) of a property, wherein the interconnect box intercepts the electrical connection between (106) the main service panel and the utility meter; at least two grid electrical inputs (108, 110 also circuit diagram marked as L1, L2) from the utility meter are connected to the interconnect box (100). At least one of the at least two grid electrical inputs may be a grid neutral input (112 also circuit diagram marked as N) from the utility meter is connected to the interconnect box (100), wherein the at least two grid electrical inputs (including the at least one grid neutral inputs if present) are combined to provide a combined grid stream (114). Note that a split phase system is typically in use in the US. Internationally, the at least two grid electrical inputs may consist of only one grid electrical input line and a grid neutral input. It is also noted that a three phase service could have only three live grid conductors and no neutral. Having the neutral is not essential to the invention, and would perform the same functions (metering, disconnect, islanding) as a three phase service the same way. At least two external electrical inputs (e.g. 116, 118, 120, 122, 124, 126, 128, 130 also circuit diagram marked as L1, L2) connected to the interconnect box having circuit breakers (e.g. 132, 134, 136, 138) for each of the at least two electrical inputs; at least one external neutral input (e.g. 140, 142, 144 and 146 also marked as circuit diagram N) connected to the interconnect box; at least one shorting block (148) used to merge together two of the at least two external electrical inputs and one of the at least one external neutral inputs to provide an external merged stream (150); a central computing unit (150) receives the combined grid stream (114) and the external merged stream (150) and utilizes power from at least one of the combined grid stream and the external merged stream to generate power and source voltage on energy metering, wherein the combined grid stream (114) and the external merged stream from the central computing unit (150) are connected through an electronically controlled disconnect switch (154) and an emergency manual AC disconnect switch (156) to a power distribution block (158) that ties the external merged stream (150) into the combined grid stream (114) and the main service panel (104).
There may be a disconnect switch (e.g. 160, 162, 154, 156) on at least one of the grid electrical inputs (e.g. disconnect switch 160), the external electrical inputs (e.g disconnect switch(es) 162), the combined grid stream and the external merged stream. The disconnect switches may be controlled by at least one of internal rules, internal logic and remote commands. There may be grid disconnect switch (160) for the at least two grid electrical inputs from the utility meter, wherein the grid disconnect switch rapidly opens as soon as grid outage is detected to enable a renewable source to continue to generate AC power.
Each of the at least two external electrical inputs may have a disconnect switch and a current transformer. An external merged stream may be load balanced and a current transformer may be on one of at least two external electrical inputs. There may also be a current transformer (e.g. 164, 166) on at least one of the grid electrical inputs, the external electrical inputs, the combined grid stream and the external merged stream. There may be a DC backup power from a renewable source in communication with the central computing unit, wherein the central computing unit utilizes power from the DC backup power in the event of a grid outage. There may also be a communication link between the central computing unit and at least one of an inverter, batteries, charge controllers, weather stations and sensors.
As shown in
There may be an installer interface (178) in communication with the central computing unit, wherein the installer interface allows an installer to configure the at least two external electrical inputs (108, 110) connected to the interconnect box to define a load or a source. There may be at least two current transformers (e.g. 165, 166, 167, 169) and an installer interface (178) in communication with the central computing unit (152), the installer interface (178) allows an installer to group together at least two current transformers (e.g. 165, 166, 167, 169) to define a specific load.
To enable islanding from grid in order to provide backup power from storage, the power needs to be able to interrupt the power from the grid. This means a meter socket adapter that simply hooks into and exposes connection terminals or wires that connect to the power lines is no longer sufficient. Similarly, in order to monitor consumption, the adapter has to actually interrupt the flow and bring out the flow to pass through a conductor the current through which can be metered.
This invention describes a meter socket adapter that interrupts the power flow on the home side of the meter and brings out both ends of the interrupt as connection terminals. The socket meter adapter would have electrical contacts at the bottom that plug into an existing meter socket for a utility meter. It would have receiving electrical terminals at the top into which another meter could plug in. On the line side, each electrical contact at the bottom would be directly shorted to the corresponding receiving terminal at the top with an adequately rated conductor. On the load side, the electrical contacts and receiving terminals are isolated from one another. All of the above shall be in the first housing. In the interconnect box, there may be two sets of connection terminals. Each set of connection terminals would have the same number of contacts as there are on the load side. One set shall be called OUT and the top layer load side contacts shall be directly wired to this set of terminals. The second set shall be called IN and the bottom layer load side receiving terminals would be directly wired into this second set of terminals. To complete the circuit interrupted by the socket adapter, each terminal from the IN section would need to be directly connected to the corresponding terminal from the OUT section using an adequately rated conductor. Instead of directly connecting them, such connection may be made through an interconnect, monitoring, and control box as described in the first part of this disclosure. Such a connection enables consumption metering, islanding, as well as additional loads/sources interconnect.
The present invention increases demand response, grid assist, time shifting of loads, and net export curtailment. It allows the ability to interconnect renewables and storage easily behind the meter without disturbing, replacing, or upgrading electrical wiring and equipment in the home allows the system to engage in these grid interactive operations to generate maximum value. Moreover, as long as the interconnect box, the meter enclosure, and the meter itself can handle the combined maximum amperage of the connected sources and loads, the rest of the electrical system needs to only be sized to handle their max load before solar/storage was introduced into the picture. Loads and sources connected to the interconnect box can freely source or sink current to their maximum capability without issue.
As will be recognized by those skilled in the art, the innovative concepts described in the present application can be modified and varied over a wide range of applications. Accordingly, the scope of patented subject matter should not be limited to any of the specific exemplary teachings discussed above, but is instead defined by the following claims.
This application claims the priority benefit under 35 U.S.C. §119(e) of U.S. Provisional Application No. 62/281,787 filed on Jan. 22, 2016, the disclosures of each of which are incorporated herein by reference in its entirety. The present disclosure generally relates to a combined interconnect, metering, and control box and a utility meter socket adapter for adapting the combined interconnect, metering, and control box to existing electrical infrastructure.
| Number | Date | Country | |
|---|---|---|---|
| 62281787 | Jan 2016 | US |
