Smart Electrical Panel Product

Overview

A smart electrical panel is a retrofit upgrade to a conventional circuit breaker panel that adds individual metering, remote switching, and energy analytics to every branch circuit. Unlike traditional panels where circuits are either always-on or manually reset by a technician, a smart panel allows homeowners or facility managers to view and control circuit loads from a mobile app, enabling energy optimization and demand response participation.

The core innovation is replacing standard magnetic breakers with electronically controlled contactors on each circuit. These relay contacts are driven by isolated PWM drivers, allowing the panel's central processor (the Network Gateway & Compute) to open or close any circuit on command. Simultaneously, a distributed array of [[demand-response-controller-current-transformer|current transformers]] measures the real-time power draw on each circuit, feeding this data back to the gateway for analytics.

Architecture

Service Entrance and Main Disconnect

The Main Service Disconnect module contains the Main Breaker, a 200 A rated breaker that isolates the entire panel from the utility. This is legally required for safety; if a fire threatens or an electrician is working on the service entrance, the disconnect fully de-energizes the panel. A Main Service CT Clamp clamps the main service line, giving the processor visibility of total household consumption.

Circuit Metering

The Circuit Metering Array is the energy visibility layer. A Multi-Circuit CT Array of 20 flexible current transformer clamps wraps around individual branch circuit conductors. Each CT has a 5 A secondary winding; the Analog-to-Digital Converter Card is a 16-channel analog-to-digital converter that samples each CT at 1 kHz, measures RMS current, and calculates instantaneous power (I × V). Over time, the gateway integrates these samples into energy consumption (kWh) per circuit.

The ADC resolution is critical: a 16-bit converter with ±0.5% accuracy can detect loads as small as 100 W and track power factor (the phase shift between voltage and current), revealing reactive loads like motors and transformers. This data is retained locally and synced to the cloud, enabling long-term consumption trending.

Switchable Relay Circuits

The Switchable Breaker Bank replaces the fixed breaker bank with electronically switchable contactors. Each circuit has a pilot-duty relay (15–50 A rated) wired in series with the load. The Relay Gate Drive Board supplies 12 V gate pulses to coil transistors, commanding each relay open or closed. A user can remotely turn off a bedroom air conditioner via mobile app, and the relay opens within 100 milliseconds.

Over-current protection comes from two layers: fast-acting Thermal Fuse links on each relay coil (arc protection), and software-based load tracking in the gateway (if a circuit exceeds 80% of its breaker rating, the app alerts the user to prevent nuisance shutdowns).

Gateway and Analytics

The Network Gateway & Compute is an ARM-based single-board computer (quad-core, 2 GB RAM) running a minimal Linux distribution. Its primary job is:

• Poll the Analog-to-Digital Converter Card every 100 ms, collecting current snapshots from all 20 circuits.
• Run a Modbus TCP server, accepting commands to open/close relays from the mobile app or cloud platform.
• Log energy data to a local SQLite database (rolling 30-day history) and periodically sync to cloud.
• Detect faults: overcurrent, overtemperature, network disconnection.

The gateway communicates via Gigabit Ethernet Port (Gigabit Ethernet with Power-over-Ethernet) for reliable hard-wired connection, and via Wi-Fi 6 Module (Wi-Fi 6) as a fallback if Ethernet is unavailable. Typical network round-trip latency is 50–150 ms.

Manual Override and Thermal Management

If the network is down, the Manual Override Console allows a technician or homeowner to override the gateway. A Button Bank provides circuit-by-circuit push-button control, and a latching Manual Hold Relay holds the breaker state even if power is lost (preventing unintended reconnection).

Relay switching dissipates heat (a 50 A relay conducting generates ~2–3 W of I²R loss). The Heat Dissipation System module, featuring a heatsink and thermostatic blower motor, keeps the relay frame below 70 °C even during sustained high-current scenarios. A Thermal Baffle directs air over the heatsink for efficient cooling.

Installation and Integration

A smart panel retrofit typically takes 4–8 hours of licensed electrician time. The existing panel is de-energized, the old breaker bank is removed, and the new relay modules and gateway board are installed on DIN rails. All existing circuit wiring connections are preserved; the electrician simply moves the load wire from the old breaker screw terminal to the new relay terminal.

The panel is provisioned via a mobile app that scans a QR code on the gateway, enrolls it with the cloud platform, and downloads a circuit layout template. The user assigns names to each relay ("kitchen-oven," "ev-charger," "hvac"), and the app displays real-time power for each.

Energy and Demand Response

A smart panel enables several value streams:

Energy visibility: Homeowners or facility managers can see which circuits consume the most power, identify always-on phantom loads, and find optimization opportunities (e.g., "the water heater runs 18 hours/day; installing a timer would save $400/year").

Time-of-use optimization: If the utility offers lower rates during off-peak hours, a smart panel can automatically shift deferrable loads (EV charging, water heating, pool pumping) to those windows.

Demand response: Like the Demand Response Controller, a smart panel can participate in utility load-shedding programs, remotely dropping non-critical circuits on command.

Solar integration: Combined with a rooftop solar array, a smart panel can prioritize high-consumption circuits to use solar production and import less from the grid.

Economic returns are typically modest ($50–$200/year in utility savings plus demand response incentives) but accumulate over the 25-year panel lifespan.

Standards and Compliance

Smart panels must meet:

• UL 67: Standard for Panelboards and Power Distribution Equipment
• IEEE 1689: Smart Grid Interoperability of Energy Technology and Information Technology Operation with the Electric Power System
• IEC 61008-1: Residual Current Operated Circuit-Breakers
• Local electrical code: Installation must comply with the National Electrical Code (NEC, USA) or equivalent regional standard

The relay switching frequency is regulated to prevent harmonic injection into the grid; most designs limit switching to once per second to avoid capacitive coupling effects on neighboring circuits.