Acrel ADW300 (pv)
The Acrel ADW300 is a three-phase DIN-rail energy meter for low-voltage networks, used here in its PV production variant to monitor solar generation at the point of feed-in. This Modbus RTU template reads per-phase voltages on phases A, B, and C, per-phase currents, per-phase active power, total active power, and cumulative energy. Together these registers give installers a complete picture of AC output from a PV inverter or string combiner without any additional hardware. The Acrel ADW300 (pv) template imports into ModbusCloud in one click and starts logging production data immediately.
- Protocol
- Modbus RTU
- Connection
- RS485
- Registers
- 11, read only
- Brand
- Acrel
- Last updated
Registers (11)
11 read, 0 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| power | W | Read | |||
| energy | Wh | Read | |||
| currents_a | mA | Read | |||
| currents_b | mA | Read | |||
| currents_c | mA | Read | |||
| voltages_a | V | Read | |||
| voltages_b | V | Read | |||
| voltages_c | V | Read | |||
| powers_a | W | Read | |||
| powers_b | W | Read | |||
| powers_c | W | Read |
Loading registers…
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Use cases
- Monitor total PV active power in real time to verify that the solar installation is producing at expected output.
- Track cumulative energy to generate daily, monthly, and annual PV yield reports for building owners.
- Compare per-phase active power on phases A, B, and C to detect phase imbalance in three-phase inverters.
- Alert on unexpected drops in phase voltage to identify grid disturbances or inverter protection trips.
- Verify per-phase current readings after CT ratio changes to confirm correct scaling before going live.
Installation
Enable Modbus RTU on the Acrel ADW300 by pressing the keypad to enter the communication settings menu, then set the device address, baud rate (default 9600), and parity to match your bus.
Wire the RS485 A and B terminals of the ADW300 to the corresponding A and B terminals on the ModbusCloud Gateway using a shielded twisted-pair cable; keep the total bus length under 1200 metres and terminate if the meter is at the end of the chain.
In the ModbusCloud portal, add the Gateway, import the Acrel ADW300 (pv) template, and assign the Modbus unit ID you set on the device in step 1.
Confirm communication by spot-checking the live value of the power register (address 36) in the portal; a non-zero signed value during daylight confirms the meter is responding and the CT ratio is applied.
Things to watch for
All register values read as zero even during daylight. Why?
The most common cause is an incorrect CT ratio configured on the meter. The ADW300 applies a CT multiplier to scale raw current readings. If the CT ratio is set to 1 but external CTs are in use, all derived power and energy values will be near zero. Check the CT ratio in the meter's settings menu and match it to your installed transformer ratio.
The gateway connects but no register values appear. What now?
Verify the RS485 wiring polarity: swapping the A and B terminals is the most frequent cause of a silent bus. Also confirm that the Modbus unit ID in the portal matches the address set on the meter's keypad, and that baud rate and parity settings are identical on both ends.
Phase voltage readings look wrong or wildly out of range. What should I check?
If you are using potential transformers, the PT ratio must be programmed on the meter. With direct voltage connection, the PT ratio must be set to 1. A mismatch between the configured ratio and the actual wiring produces incorrect voltage and derived power readings across all three phases.
The power register alternates between positive and negative values unexpectedly.
The power register at address 36 is a signed int32, so negative values indicate reverse power flow, which is normal when checking net-metering or grid-export conditions. If the sign is permanently inverted compared to expectation, the current transformer on one or more phases may be installed with reversed polarity. Physically reversing the CT will correct the sign.
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