Allto Solar AS-20W-M User Manual

The Allto Solar AS-20W-M is a 20W Monocrystalline Solar Panel designed for portable and off-grid power applications. It features high-efficiency monocrystalline cells, a durable aluminum frame, tempered glass surface, IP67-rated junction box, and MC4 connectors. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Performance Monitoring 8. Safety Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Monocrystalline solar cells, Aluminum frame, Tempered glass surface, IP67 junction box, MC4 connectors.

Feature	Description
Cell Type	High-efficiency monocrystalline silicon
Rated Power	20W at Standard Test Conditions (STC)
Frame Material	Anodized aluminum alloy
Surface Protection	3.2mm tempered glass with anti-reflective coating
Junction Box	IP67 rated, waterproof and dustproof
Connectors	Standard MC4 connectors (male/female pair included)
Dimensions	Approximately 540mm x 350mm x 25mm
Weight	Approximately 2.5 kg
Operating Temperature	-40°C to +85°C
Warranty	25-year linear power output, 10-year product warranty

Installation

Unpack and inspect contents. Handle with care to avoid damaging glass surface.

Choose Location: Select area with maximum sunlight exposure, free from shading.
Mounting: Use provided mounting brackets or compatible hardware. Secure to stable surface (roof, ground mount, etc.).
Orientation: Angle panel towards the sun (typically 15-40 degrees depending on latitude).
Connect Cables: Attach MC4 connectors from panel to charge controller or extension cables.
Grounding: Connect grounding wire to frame grounding point for safety.

WARNING! Do not install during rain, snow, or high winds. Ensure all electrical connections are dry before making contact.

First-Time Setup

Connect panel to your solar power system properly.

Connect to Charge Controller: Ensure charge controller is off. Connect panel's positive (+) and negative (-) cables to corresponding controller inputs.
Connect to Battery: Connect charge controller to battery following manufacturer's instructions (positive to positive, negative to negative).
Power On: Turn on charge controller. Verify panel voltage/current readings.
Position for Sunlight: Adjust panel angle for optimal sun exposure.

CAUTION! Never connect panel directly to battery without a charge controller. Reverse polarity can damage equipment.

Specifications

Maximum Power (Pmax): 20W
Open Circuit Voltage (Voc): 21.6V
Short Circuit Current (Isc): 1.18A
Maximum Power Voltage (Vmp): 18.0V
Maximum Power Current (Imp): 1.11A
Cell Efficiency: >22%
Power Tolerance: ±3%
Maximum System Voltage: 600V DC (UL) / 1000V DC (IEC)
Fire Rating: Class C (UL 790)
Hail Resistance: 25mm diameter at 23m/s impact

Controls and Settings

Panel has no active controls. System control is through connected charge controller.

Charge Controller Settings (typical):

Battery Type: Select (AGM, Gel, Lithium, etc.)
Charging Voltage: Set according to battery specifications
Load Control: Configure timer or voltage-based load output
Temperature Compensation: Enable if sensor available

Monitoring: Check controller display for: - PV Voltage/Current - Battery Voltage/State of Charge - Daily Power Generation

Connecting Devices

Connect to charge controller, battery bank, or other panels.

Series Connection: Connect positive of one panel to negative of next to increase voltage.
Parallel Connection: Connect all positives together and all negatives together to increase current.
To Charge Controller: Use appropriate gauge cables. Ensure polarity correct.
To Inverter: Connect through charge controller or appropriate combiner box.

Tip: Use MC4 branch connectors for parallel connections. Never exceed maximum system voltage.

Performance Monitoring

Monitor panel performance regularly.

Daily Check: Verify charge controller shows PV input during daylight.
Monthly Cleaning: Clean surface to maintain efficiency (see Care & Cleaning).
Seasonal Adjustment: Change tilt angle 2-4 times per year for optimal performance.
Performance Log: Record daily kWh production if controller has logging capability.
Shading Check: Ensure no new obstructions (tree growth, new structures).

Expected Output: 20W panel produces approximately 60-100Wh daily depending on location and season.

Safety Features

Built-in safety features and precautions:

Bypass Diodes: Minimize power loss from partial shading
Frame Grounding: Dedicated grounding point for lightning/surge protection
IP67 Junction Box: Water and dust resistant connections
MC4 Connectors: Locking connectors prevent accidental disconnection

Safety Precautions: - Cover panel with opaque material during installation/maintenance - Do not disconnect under load - Wear insulated gloves when working with live connections - Keep children and pets away from installation area

Care & Cleaning

Regular maintenance ensures optimal performance.

Cleaning Frequency: Every 1-2 months, more often in dusty areas.
Cleaning Method: Use soft cloth or sponge with mild soap and water. Rinse with clean water.
Cleaning Time: Early morning or late evening when panel is cool.
Inspection: Check for cracks, discoloration, or connection corrosion.

CAUTION! Do not use abrasive materials, harsh chemicals, or high-pressure water. Do not walk on panel surface.

Regulatory Information

Certifications: UL 1703, IEC 61215, IEC 61730. Complies with FCC Part 15 Class B for electromagnetic compatibility. CE marked for European market. RoHS compliant. Copyright © 2025 Allto Solar; trademarks of Allto Renewable Energy, Inc. For support, visit www.alltosolar.com or contact 1-800-555-ALLTO (2558).

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power output	Shading, dirty surface, connections	Remove obstructions, clean panel, check all connections are secure.
Low power output	Partial shading, incorrect angle, aging	Reposition panel, adjust tilt angle, check for cell damage.
Voltage reading zero	Open circuit, diode failure, broken cells	Check continuity with multimeter, inspect for visible damage.
Hot spots on panel	Cell mismatch, shading, diode issue	Identify and eliminate shading source; may require professional service.
Water in junction box	Seal failure, physical damage	Disconnect immediately. Dry thoroughly. Replace junction box if damaged.

Warranty Service: Contact Allto Solar with serial number and purchase proof.

Technical Support: 1-800-555-ALLTO (2558); www.alltosolar.com/support