User Manual for Huawei MERC-(1300W, 1100W)-P Smart PV Optimizer

Quick guide from the manual

The Huawei Smart PV Optimizer is a DC-DC converter installed on the rear of PV modules. It manages the maximum power point (MPP) of each module to improve energy yield and provides module-level shutdown and management. This guide covers installation, cable connection, commissioning, and troubleshooting.

Product Overview

The optimizer is delivered with two types of input power cables: long (1300 mm) or short (100 mm). Select the optimizer based on the PV module cable length:

• For PV modules with long cables, select optimizers with short input cables.
• For PV modules with short cables, select optimizers with long input cables.

Installation Requirements

Ensure the following conditions are met before installation:

• Clearance: Maintain at least 25 mm of clearance around the optimizer for ventilation.
• Environment: Do not install in positions that may be submerged in water. Avoid direct sunlight.
• Temperature: Recommended ambient temperature is 70°C or less. If it exceeds this, the optimizer may shut down for overtemperature protection and recover automatically once cooled.
• Safety: Do not store flammable or explosive materials in the installation area. Do not cut the delivered cables.

Installing the Optimizer

Select the installation mode based on your mounting scenario:

• Extruded Aluminum Profile: Use a T-shaped bolt and nut (purchased separately).
• PV Module Frame (Bolt Assembly): Ensure a mounting hole is reserved on the frame. Use bolt assembly and nut (purchased from a third party).
• PV Module Frame (Frame Mounting Bracket): Purchase the bracket separately. Install the optimizer before the PV module.

After determining the position, remove the SN label from the optimizer and attach it to the physical layout template.

Installing Optimizer Cables

Ensure input (IN) and output (OUT) cables are correctly connected to avoid device damage. The typical output voltage (V1) of a single optimizer is 1 V.

• Connect the optimizer input (IN) cable to the PV module connection box.
• Connect the output (OUT) cables to the adjacent optimizer or solar inverter.
• Route AC and DC power cables in different troughs or pipes with at least 10 cm spacing.
• Route the home-run cable next to the cables between PV modules to reduce EMC impact.

Power-On Commissioning

Use the FusionSolar app for commissioning:

1. Open the FusionSolar app and log in to the installer account.
2. Choose Me > Device commissioning and connect to the solar inverter's WLAN hotspot.
3. Select installer, enter the password, and log in.
4. Choose Device monitoring, select the PV string, and check the optimizer status.

Troubleshooting

Check the optimizer status in the FusionSolar app:

• Green: Running properly.
• Gray: Offline. Check SN and location information, then search again.
• Red: Faulty.
• Yellow: Disconnected.

If changes occur (adding/deleting/replacing optimizers), turn off DC and AC switches, wait 5 minutes, perform the operation, and run the optimizer search again.

Replacing an Optimizer

1. Power off the solar inverter and remove the faulty optimizer.
2. Install the new optimizer and connect cables.
3. Power on the inverter, log in to the app, choose Devices > Inverter, and tap Optimizer Search.
4. Choose Devices > Connected devices > Optimizer, select the faulty optimizer, and tap Device Replacement.

Precautions

• Use Staubli MC4 DC connectors.
• Optimizers are not supported in off-grid scenarios.
• Partial configuration is not allowed; all PV modules must be connected to optimizers.
• Use insulated tools and proper PPE during installation.