The Spanish photovoltaic installer needed two numbers side by side every day: what the arrays produced and what the site consumed. Daily generation has a planned value, and falling under it is the alarm that matters, because a dead string or a stopped inverter should show up the same day instead of at the next meter read.
The building was already in service, so the metering had to go into existing distribution boxes and the data had to leave without a new cable run between floors.
ADW300 three-phase meters on the generation and consumption circuits feed an AWT100-4G gateway, which uploads to the Acrel IoT platform. Both the installer and the end customer see live readings and alarms on a computer or a phone, and manual meter reading was dropped.
What one meter covers
- Active energy in kWh in both directions plus four-quadrant reactive energy, so generation and consumption stay separate on the same circuit.
- Voltage, current, active, reactive and apparent power, power factor and frequency, with total harmonics and individual harmonics 2 to 31 — the check that matters on a PV feeder.
- Four temperature channels (A, B, C, N) to ±2 °C and one leakage-current channel, where a cable or enclosure problem usually shows first.
- 4 DI and 2 DO, and an energy pulse output at 6400 or 400 imp/kWh for a cross-check against a reference instrument.
Electrical and installation data
| Item | ADW300 |
|---|---|
| Rated voltage | 3×57.7/100 V, 3×220/380 V, 3×380/660 V, 50 Hz reference |
| Current input | External current transformer, 3×1(6) A; open-type CT version ADW300W |
| Energy accuracy | Class 0.5S active (ADW300), class 1 (ADW300W), IEC 62053-22:2003 |
| Starting current | 1‰ Ib at class 0.5S, 4‰ Ib at class 1 |
| Auxiliary supply | AC 85-265 V, less than 2 W |
| Onboard wireless | LoRa with EU868 channel plan (863-870 MHz) or 470 MHz, up to 1 km in open space; 2G and NB-IoT options |
| Wired ports | RS485 with Modbus-RTU, plus infrared at a fixed 1200 bps |
| Mounting | DIN rail inside the distribution box, 72 × 87.8 × 71.5 mm |
| Environment | −20 to +55 °C operating, ≤95% RH non-condensing, up to 2000 m |
Series values as published on the
For a PV monitoring quotation: number of inverters with their currents, whether current transformers are already fitted, the distance from the metering point to the gateway, and which network the site allows — 868 MHz LoRa or cellular.
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Post time: Jun-21-2023
