1. Product Overview & Features
The POWLAND SMR II Hybrid Solar Inverter is a versatile power solution designed for both 4KW (24V) and 6KW (48V) systems. It integrates an MPPT solar charger with a maximum input of 500VDC and 120A charging current, offering efficient energy conversion and management. This inverter supports operation with and without batteries and includes built-in WiFi for convenient monitoring.
Key Features:
- Pure sine wave AC output for sensitive electronics.
- Output power factor COSφ=1.0.
- Configurable AC/Solar Charger priority via LCD settings.
- Wide PV input voltage range (60Vdc-500Vdc).
- Built-in 120A MPPT solar charger.
- Capable of working with or without batteries (PV voltage >200Vdc required for battery-less operation).
- Built-in anti-dusk kit for harsh environments.
- Smart battery charger design for optimized battery performance.
- Compatible with mains voltage or generator power.
- Comprehensive protection: Overload, Over temperature, Short circuit.
- Integrated WiFi monitoring function.
- CAN communication for Battery Management Systems (BMS).
2. Setup & Installation
2.1 Mounting the Unit
- Placement Considerations: Do not mount the inverter on flammable construction. Mount on a solid, non-combustible surface (e.g., concrete).
- Visibility: Install the inverter at eye level to allow easy LCD display readout.
- Ventilation: For proper air circulation and heat dissipation, allow a clearance of approximately 20 cm to the sides and 50 cm above and below the unit.
- Temperature: The ambient temperature should be between -10°C and 50°C to ensure optimal operation.
- Orientation: The recommended orientation is to adhere the unit vertically to the wall.
- Wiring Space: Ensure sufficient space for wiring and connections.
2.2 Connection Diagram
The following diagram illustrates the typical connection setup for the hybrid solar inverter. Ensure all connections are secure and follow local electrical codes.
2.3 Battery Connection (6KW Model)
For the 6KW model, a 48VDC battery system is required. Connect four 12V batteries in series as shown in the diagram below to achieve the necessary 48VDC.
2.4 Solar Photovoltaic Panel Wiring
Proper wiring of solar panels is crucial for optimal performance and safety. PV cable dimensions should be 6-8A/mm².
- In Series: Increases the voltage of the system. The total voltage must be less than the hybrid inverter's maximum PV input voltage (Voc). Ensure all photovoltaic panels are of the same type.
- In Parallel: Increases the current of the system. The total current should not exceed the maximum PV input current of the hybrid inverter.
2.5 Inverter Components and Ports
Familiarize yourself with the inverter's external components and connection ports:
3. Operating Instructions
3.1 Charging Modes
The inverter offers four distinct charging modes to optimize energy usage:
- Mains First: Prioritizes charging from the utility grid.
- Solar First: Prioritizes charging from solar panels.
- Hybrid Charge: Utilizes both solar and mains power for charging.
- Only Solar: Charges exclusively from solar panels.
3.2 Output Modes
The inverter provides flexible output modes to manage power delivery to your loads:
- Solar First: Prioritizes power from solar panels.
- Mains First: Prioritizes power from the utility grid.
- Inverter First: Prioritizes power from the inverter (battery).
- Hybrid Output: Combines power sources for output.
3.3 LCD Display and Function Keys
The LCD screen provides real-time status and allows configuration. The LED indicators offer quick visual status updates.
3.4 WiFi Monitoring
The inverter features built-in WiFi for remote monitoring. Download the SmartESS app for iOS or Android using the QR codes provided below.
3.5 System Diagram (Operation with Battery)
This diagram illustrates how the inverter operates within a system that includes solar power, a generator or utility grid, external battery packs, and home appliances.
4. Maintenance
To ensure the longevity and optimal performance of your POWLAND SMR II Hybrid Solar Inverter, regular maintenance is recommended:
- Clearance: Regularly check that the recommended clearances around the inverter (20 cm sides, 50 cm top/bottom) are maintained to ensure proper heat dissipation.
- Connections: Periodically inspect all electrical connections (AC input/output, PV input, battery input) for tightness and signs of corrosion.
- Environment: The built-in anti-dusk kit helps in harsh environments, but ensure the inverter's vents are not blocked by dust or debris. Clean the exterior with a dry, soft cloth as needed.
- Battery Health: If using batteries, monitor their health and charge levels via the LCD or WiFi monitoring app. Follow battery manufacturer guidelines for maintenance.
5. Troubleshooting
The inverter is equipped with various protection features. Refer to the LED indicators for initial fault diagnosis. Common issues and their potential causes/solutions are listed below:
5.1 Protection Features
5.2 Common Issues & Solutions
- No Output Power: Check AC input, battery connection, and PV input. Ensure the power on/off switch is in the 'ON' position. Check for fault indicators on the LCD.
- Low Output Power: Verify PV array size and orientation. Check battery charge level. Ensure no overload condition.
- Fault LED On: Refer to the LED Indicator table in Section 3.3 for specific fault messages. Address the underlying issue (e.g., reduce load for overload, check temperature for overheating).
- Battery Not Charging: Check PV input voltage and current. Verify AC input if charging from grid. Ensure battery connections are secure.
- WiFi Monitoring Issues: Ensure the inverter's WiFi module is enabled and connected to your network. Check app settings and internet connectivity.
For persistent issues, contact customer support.
6. Specifications
Detailed technical specifications for the POWLAND SMR II Hybrid Solar Inverter (4KW and 6KW models):
7. Warranty & Support
7.1 Warranty Information
The POWLAND SMR II Hybrid Solar Inverter comes with a 1-year warranty from the date of purchase. This warranty covers manufacturing defects and malfunctions under normal operating conditions. Please retain your proof of purchase for warranty claims.
7.2 Certifications
The product is certified to meet European safety standards, including CE certification and compliance with EN/IEC62109-1, EN/IEC62109-2.
7.3 Customer Support
If you encounter any problems with your inverter or require technical assistance, please contact your seller or POWLAND customer support. All inquiries are typically answered within 24 hours.