Qoltec Hybrid Solar Inverter Off-Grid

Introduction

Thank you for choosing the Qoltec solar inverter. This manual will guide you through the setup, operation, and troubleshooting of your device. Please read it carefully before installation and operation.

About This Manual

This manual provides instructions for assembly, installation, operation, and troubleshooting. Keep it for future reference. It includes safety guidelines, installation information, and details on tools and wiring.

Product Overview

This is a multifunctional inverter combining inverter, solar charger, and battery charger functions for uninterrupted power supply. The LCD display offers user-friendly controls for battery charging current, AC/solar charging priority, and input voltage settings.

Figure 1: Unit Components

• 1. LCD Display
• 2. Status Indicator
• 3. Charging Indicator
• 4. Error Indicator
• 5. Function Button
• 6. Grounding Terminal
• 7. AC Input
• 8. AC Output
• 9. Battery Input
• 10. PV Input
• 11. Wi-Fi Communication Port
• 12. On/Off Switch

Installation

I. Preparation

Inspect the unit for any damage before installation. Ensure all components are present: solar inverter and user manual.

Remove the bottom cover by unscrewing the three screws before connecting wires.

II. Unit Installation

Consider the following when selecting an installation location:

• Do not mount on flammable materials.
• Mount on a solid surface.
• Install at eye level for optimal LCD visibility.
• Optimal ambient temperature: 0°C to 55°C.
• Recommended mounting position: Vertical, against a wall.
• Ensure adequate space around the unit for heat dissipation and cable removal.

NOTE: Suitable for mounting ONLY on concrete or other non-combustible surfaces.

Mount the unit using M4 or M5 screws.

III. Battery Connection

NOTE: A separate DC disconnect device is required for safe operation and regulatory compliance. Refer to the table for appropriate fuse or breaker sizing.

Insulation Length:

WARNING: All wiring must be performed by qualified personnel.

Use the correct cable for battery connection to ensure system safety and efficiency. Follow recommended stripping lengths (L1, L2).

Figure 5: Recommended Cable Stripping Lengths

Battery Connection Steps:

1. Strip 18mm of insulation from positive and negative wires.
2. Connect battery packs according to unit requirements. Use recommended battery capacity.
3. Slide the battery cable into the inverter's battery connector and tighten screws to 2-3 Nm. Ensure correct polarity (+ to + and - to -) for both battery and inverter/charger.

WARNING: Risk of electric shock. Installation requires caution due to high battery voltage.

ATTENTION: Do not place anything between the inverter terminal's flat part. Do not apply antioxidant to terminals before connection.

NOTE: Ensure correct polarity (+ to + and - to -) before final DC connection.

IV. AC Input/Output Connection

NOTE: Install a separate AC switch between the inverter and the AC power source for safe disconnection during maintenance and overcurrent protection. A 50A breaker is recommended.

NOTE: Terminal blocks are marked "IN" and "OUT". Do not confuse them.

WARNING: All wiring must be performed by qualified personnel.

Use the correct cable size for AC connection.

AC Input/Output Connection Steps:

1. Ensure the DC breaker is open before making AC connections.
2. Strip 10mm of insulation from six wires. Shorten the phase (L) and neutral (N) wires by 3mm.
3. Insert AC input wires according to terminal block polarity. Connect the PE (ground) wire first (yellow-green), then L (brown), then N (blue).
4. Connect AC output wires similarly, ensuring PE is connected first.
5. Verify all wires are correctly connected.

V. PV Connection

NOTE: Install a DC breaker between the inverter and PV modules before connecting.

WARNING: All wiring must be performed by qualified personnel.

Use the correct cable size for PV connection.

PV Module Selection: Consider the following parameters:

1. PV module open-circuit voltage (Voc) must not exceed the inverter's maximum open-circuit voltage.
2. PV module open-circuit voltage (Voc) must be higher than the minimum battery voltage.

Solar Charging Mode

Example configurations for 450 Wp and 550 Wp PV modules:

PV Module Connection: Follow these steps:

1. Strip 10mm insulation from positive and negative cables.
2. Verify correct polarity of connection cables and PV input connectors. Connect positive (+) to positive (+) and negative (-) to negative (-).

VI. Final Assembly

Once all wires are connected, replace the bottom cover and secure it with the screws.

Operation

I. Power On/Off

After correct installation and battery connection, press the On/Off switch to power on the unit.

II. Operation Panel and Display

The operation panel is located on the front of the inverter and includes indicators, function buttons, and an LCD display showing operating status, input/output information, and power source details.

Figure 13: LED Indicators and Messages

III. LCD Display Settings

Press and hold the ENTER button for 3 seconds to enter setting mode. Use UP/DOWN buttons to select programs and ENTER to confirm or ESC to exit.

Program Settings

Battery Equalization

The charge controller includes a battery equalization function to eliminate negative chemical effects like stratification and sulfate crystal buildup, which can reduce battery capacity. Periodic equalization is recommended.

How to Apply Equalization:

1. Activate equalization in LCD settings (Program 33).
2. Apply via:
• Set equalization interval in Program 37.
• Activate immediate equalization in Program 39.

When to Perform Equalization:

The controller enters equalization mode when the set time interval is reached or immediate equalization is activated.

Equalization Charging Time and Limit:

During equalization, the controller provides maximum power until the battery reaches the set equalization voltage. A constant voltage charge maintains this voltage. The battery remains in equalization until the set time is reached. If the set time passes and the voltage is still below the equalization voltage, the equalization time is extended. If the voltage remains low after the extended time, equalization ends, and the unit returns to maintenance mode.

Lithium Battery Settings

Settings for Lithium Battery without Communication

To avoid BMS protection triggers when there's no communication between the BMS and the unit:

1. Obtain BMS specifications (Max Charge Voltage, Max Charge Current, Discharge Protection Voltage).
2. Set Battery Type to "LIB".
3. Set CV (Charge Voltage) to BMS Max Charge Voltage minus 0.5V.

Troubleshooting

Problem: Unit shuts down during startup.

Possible Cause: Battery voltage too low.

Solution: Charge the battery. Replace the battery.

Problem: No response after startup.

Possible Cause: Battery voltage too low, incorrect battery polarity.

Solution: Charge the battery. Check battery and cable connections. Replace battery pack.

Problem: Power is available, but the unit operates in battery mode.

Possible Cause: Input voltage displayed as 0 on LCD, green LED blinking (indicating poor AC quality or activated protection).

Solution: Check if the AC breaker is off and AC wiring is correct. Check AC cable thickness and length. Verify generator operation and input voltage settings.

Problem: Unit powers on, internal relay repeatedly starts and stops.

Possible Cause: Battery is disconnected.

Solution: Set "Solar First" as output source priority. Check battery cable connections.

Problem: Buzzer sounds continuously, red LED is on.

Possible Cause: Error code 07 (Overload), 05 (Short circuit), 02 (Internal temperature >100°C), 03 (Battery overcharged), 06/22 (Invalid output voltage), 08/09/15 (Component failure), 13 (Overcurrent/overvoltage), 14 (Low bus voltage).

Solution: Reduce load. Check wiring and remove abnormal loads. Ensure ventilation. Contact service center.

Specifications

Table 1: Line Mode Specifications

Table 2: Inverter Mode Specifications

Table 3: Charger Mode Specifications

Table 4: General Specifications

Maintenance

1. Keep the VALVATOR clean with a soft, dry cloth. Do not use chemicals.
2. Regularly inspect power cables and connectors for damage (abrasions, cracks, loose connections).
3. Ensure ventilation openings are clean and unobstructed for proper cooling.
4. Avoid contact with water or other liquids to prevent electrical damage.

Disposal

This product is subject to WEEE regulations. Dispose of it at an authorized electrical waste collection point for safe recycling. Contact the manufacturer or an authorized service center for disposal inquiries.

Warranty and Service Information

The product is covered by a 24-month manufacturer's warranty from the date of purchase, covering defects in materials and workmanship. Contact the service department for assistance. The warranty does not cover damage from improper use, drops, mechanical damage, unauthorized repairs, or disassembly attempts.