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Sonoff POWR320D Energy Monitor Features & Wiring Guide - Communica SA

Overview: What the Sonoff POWR320D LCD Energy Monitor Does

The Sonoff POWR320D is a DIN-rail or panel-mount energy monitoring module with an integrated LCD that displays real-time power metrics. It measures voltage, current, active power (W), energy (kWh), power factor and frequency, providing local readout on the display and remote telemetry via Wi-Fi or supported gateways. For South African makers, technicians and small-scale installers, the POWR320D is useful for monitoring circuits, validating energy use in labs/education, and giving quick diagnostic information without a laptop.

Key hardware highlights

Integrated LCD for real-time metrics and simple navigation
Current measurement using an external split-core or solid-core current transformer (CT) depending on the model
Voltage sensing up to typical single-phase mains ranges (verify exact rating on the product datasheet)
Wi-Fi connectivity for remote monitoring and logging

Practical South Africa context

In South Africa (230V nominal single-phase mains), the POWR320D can monitor lighting circuits, appliances, lab benches and small workshop loads. When planning installations, consider local availability, expected lead times, and whether a CT is included; Communica stocks a range of monitoring accessories and CTs in related categories. For branch pickup and stock checks see Branches & Trading Hours.

Display and user interface

The LCD presents a rotating set of measurements and often includes buttons for switching display pages, zeroing counters, or configuring CT ratios locally. This immediate feedback is useful in workshops and classrooms where a quick visual check avoids running a mobile app.

Measurement capabilities and limits

Typical measurements available on the POWR320D include:

Voltage (V)
Current (A)
Active power (W)
Energy accumulation (kWh)
Power factor (PF)
Frequency (Hz)

Why CT ratio and wiring matter

Accuracy depends on correct CT selection and wiring. CTs have a turns ratio and a rated primary current - if you use a CT rated for 100A but your circuit draws 10A, resolution on low loads may be coarse. Conversely, using an undersized CT risks saturation at higher currents. Check the product page and match CT primary rating to expected circuit peak (e.g., motor stall currents).

For browsing compatible CTs and accessories, see the related categories and brand index at Communica: installing-sonoff-energy-monitor-powr320d-on-din-rail and best-practices-for-monitoring-appliance-power-consumption.

Standards, specifications and what to verify

Before installing, verify key specifications on the Sonoff product page or datasheet: maximum measurable voltage and current, CT type (split-core vs solid-core), accuracy class or percentage error at specified loads, supply requirements, and the device's environmental ratings. Avoid assuming suitability for unknown mains configurations without checking the datasheet.

Parameter	Typical Value (check datasheet)
Nominal input voltage	e.g., 100-300 VAC (single-phase) - confirm on product page
Current input	Depends on CT; common CTs 20A-200A
Power measurement	Active power (W) and cumulative kWh
Connectivity	Wi-Fi (2.4GHz) and local LCD

If you need an exact spec lookup or a compatible accessory, start from Communica’s all-products index: home-automation-sonoff-energy-monitor-powr320d-wifi-smart-switch.

Selection Criteria: Choosing the Right POWR320D Setup

Match the monitor variant and CT to your application. For single-circuit monitoring such as a geyser, HVAC or a workshop outlet, size the CT to cover expected peak current with ~20-30% headroom. For low-load precision (bench electronics), choose a CT with a lower primary rating and better low-current resolution.

Wiring diagram (single-phase) - ASCII

  Mains L -----+---- Load
               | 
               |          +-----------+
               +--(CT)--->| POWR320D  |-- Neutral to POWR320D
               |          |  LCD      |
  Mains N ---- +----------+-----------+

Note: CT should encircle the conductor being measured, not the whole cable bundle containing both L and N.

Basic calculations and examples

Use Ohm's law and power formulas for quick checks:

Power (W) = Voltage (V) × Current (A) × Power Factor (PF)
Energy (kWh) = (Power (W) × hours) / 1000

Example: a 230V geyser drawing 15A at PF=0.95: Power = 230 × 15 × 0.95 = 3,277.5 W ? 3.28 kW. Running 2 hours = 6.56 kWh. At an electricity tariff of ZAR 2.50/kWh (example estimate), cost ? ZAR 16.40 for that run (figures are illustrative).

Troubleshooting and accuracy tips

Ensure the CT is installed on a single conductor (phase only). Passing both phase and neutral through the CT cancels the reading.
Confirm CT orientation - many CTs have an arrow marking the direction of primary current.
Account for CT burden and wiring length; use twisted pairs for CT secondary if routing over distance.
Cross-check readings with a calibrated clamp meter when commissioning for verification.

Integration, logging and local use cases

The POWR320D commonly integrates with home automation platforms using Wi-Fi or third-party gateways. For education and labs, the local LCD plus logging provides both immediate readings and historical energy usage - useful for experiments, energy audits, and demonstration rigs. For procurement teams or campus labs, consider ordering multiple units and CT kits; check stock and pickup options at Communica’s head office in Samrand for faster collection: Communica Homepage.

Accessories and common add-ons

Split-core CTs sized to circuit peak
Din-rail enclosures or mounting kits
Patch leads and terminal blocks for neat installations
Local Wi-Fi network stability devices (if telemetry reliability is required)

Final notes for South African users

When budgeting, account for accessory costs: CTs can range from a few hundred ZAR to higher depending on accuracy and rating (prices vary; check current listings). Allow for installation time, safety isolation procedures and, where relevant, qualified electrical personnel for mains work. Communica stocks measurement tools and accessories in related categories to complete installations and testing; browse product categories to match parts and tools.

Features of Sonoff Energy Monitor POWR320D with LCD Display - Guide for SA Makers

Real-time LCD Metrics

CT Selection Matters

Local Practical Notes

Communica South Africa

Overview: What the Sonoff POWR320D LCD Energy Monitor Does

Key hardware highlights

Practical South Africa context

Display and user interface

Measurement capabilities and limits

Why CT ratio and wiring matter

Standards, specifications and what to verify

Selection Criteria: Choosing the Right POWR320D Setup

Wiring diagram (single-phase) - ASCII

Basic calculations and examples

Troubleshooting and accuracy tips

Integration, logging and local use cases

Accessories and common add-ons

Final notes for South African users

Sources

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