CraftStrom PowerMeter – Smart 1–3 Phase Energy Monitor for Plug & Play Solar (Zero-Export)

Turn Any Outlet Into a Smart, Code-Compliant Solar Connection

The CraftStrom PowerMeter is a 1–3 phase smart energy meter designed to make plug & play and balcony solar systems safe, legal, and permit-free by precisely matching your solar production to your real-time home consumption. Installed at your main panel, it measures bidirectional energy flow and commands CraftStrom inverters and batteries to operate in true zero-export mode every 0.1 seconds, preventing backfeed into the public grid.​

Key Benefits

• Zero-Export Control (Every 0.1s) – Continuously compares household load vs. solar output and throttles inverters so you only produce what you consume, keeping your system off your utility’s radar and typically avoiding interconnection agreements.​

• Legal & NEC-Friendly Plug-In Solar – By preventing reverse power flow beyond the main breaker, the PowerMeter supports NEC and UL-compliant plug-in and balcony solar designs that don’t backfeed through standard outlets.​​

• Whole-Home, 1–3 Phase Monitoring – Supports single, split, and 3‑phase services, making it suitable for typical US residential panels and small commercial setups.​

• Deep Visibility in the CraftStrom App – View live and historical consumption, solar production, net power, voltage, current, active/reactive/apparent power, frequency, and power factor in one unified dashboard.​

• Seamless Integration with CraftStrom Ecosystem – Acts as the “brain” between CraftStrom microinverters, batteries, and the app, coordinating power flows for optimal self-consumption and battery charging.

• Real-Time, Bidirectional Energy Measurement

  The CraftStrom PowerMeter continuously measures power flowing from the grid to your home and from your solar system toward the grid, using bi-directional current and voltage sensing. It calculates:​

  • Voltage $U$ on all phases

  • Current $I$ per phase

  • Active power $P$ (kW)

  • Reactive power $Q$ (kVAR)

  • Apparent power $S$ (kVA)

  • Frequency $f$

  • Power factor / phase shift (PF)

  • Import vs. export energy (kWh)​

  This data allows the system to distinguish household consumption vs. solar production in real time and enforce zero-export behavior.​

  Zero-Export for Permit-Free Balcony & Plug-In Solar

  By constantly monitoring main service power direction and magnitude, the PowerMeter instructs CraftStrom inverters and batteries to reduce output whenever export toward the grid is detected. The result:​

  • No net backfeed across the main breaker

  • Solar output always stays at or below on-site load

  • Plug-in systems can use standard outlets without violating anti-backfeed rules​​

  This zero-export control is what makes CraftStrom plug-in and balcony kits effectively “permission-free” in many jurisdictions, because they act like load-offset devices rather than grid-tied generators in utility terms.​

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  Technical Specifications

  Electrical & Measurement

  • Phases: 1–3 phase power meter​

  • Reference voltage options:

    • 3×100V, 3×380V, 3×57.7/100V, 3×220/380V (typical 120/240 V split‑phase supported via configuration)​

  • Mains frequency: 45–65 Hz, ±0.2%​

  • Power consumption: <10 VA (single phase)​

  • Active energy accuracy: Class 0.5S (high precision)​

  • Reactive energy accuracy: Class 2​

  • Pulse output:

    • 1 channel optocoupler digital output

    • Pulse width: 80 ± 20 ms

    • Pulse constant: 400 imp/kWh, 10,000 imp/kW​

  Communication

  • Internal: RS‑485, Modbus RTU / DL/T645 protocol for industrial-grade integration​

  • External wireless:

    • 2.4 GHz WiFi for cloud/app connectivity

    • 433 MHz sub‑GHz link for robust, low-latency communication with CraftStrom inverters/batteries​

  • Baud rate: 1200–19200 bps adjustable​

  Mechanical & Environmental

  • Mounting: DIN rail for standard electrical distribution panels; supports alternate mounting where DIN space is limited​

  • Dimensions: ~90 × 72 × 65 mm (3.5 × 2.8 × 2.6 in)​

  • Weight: ~0.3 kg (0.7 lbs)​

  • Operating temperature: −25°C to +55°C (−13°F to 131°F)​

  • Humidity: ≤95% non‑condensing​

  Compatibility

  • Works with CraftStrom Plug & Play Solar Kits (400W–2kW+), balcony systems, and smart battery sets for self-consumption and backup.​

  • Suitable for 1‑phase, split‑phase, and 3‑phase services, including small commercial and light industrial setups where CraftStrom systems are deployed.​

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  Use Cases

  1. Safe Plug-In & Balcony Solar (Zero Export)

  Pair the PowerMeter with CraftStrom microinverters to build legal plug-in solar systems that do not backfeed the grid, ideal for:

  • Apartments & condos using standard outlets

  • Balcony solar kits where utilities restrict export

  • Renters who want bill savings without utility paperwork​

  The PowerMeter ensures your system behaves like a dynamic load reducer, not a traditional grid-tied generator, by keeping net export at zero.​

  2. Optimized Solar + Battery Operation

  In CraftStrom solar + battery bundles, the PowerMeter:

  • Prioritizes direct self-consumption

  • Directs surplus solar to battery charging

  • Prevents export when batteries are full by throttling inverter output​

  This maximizes ROI by shifting solar energy into evenings without violating zero-export restrictions.​

  3. Whole-Home Energy Monitoring

  Beyond solar, the PowerMeter is a full smart home energy monitor:

  • Track whole-home load in real time

  • Identify energy-hog appliances via load patterns

  • Measure baseline usage before and after solar upgrades

  • Monitor multi-phase industrial or workshop loads​

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  Installation Overview

  Installation inside a main electrical panel involves working on live circuits and should follow all applicable electrical codes. Many users choose a licensed electrician for this step.​​

  Typical Install Steps (High-Level)

  1. Power down & secure panel – Remove main fuses/breaker as per manual before wiring.​

  2. DIN-rail mounting – Clip PowerMeter onto DIN rail or approved alternative location in the distribution box.​

  3. Phase & neutral wiring – Connect all required phase conductors and neutral to the metering terminals, ensuring all pressure screws are fully tightened.​

  4. CT/clamp wiring (where used) – Install and orient clamp-on CT sensors around main conductors if the configuration uses external current transformers.​

  5. Restore power & verify – Reinstall main fuses/breaker; PowerMeter boots and starts measuring.​

  6. Pair with CraftStrom app – Use the app to register the PowerMeter, then link it to your CraftStrom inverters and batteries so they can receive control commands for zero-export and optimization.​​

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