Otonohm Sun Charge 20W Manual

The Otonohm Sun Charge 20W is a high-efficiency solar charger designed for portable power needs, featuring 20W output, USB-C and USB-A ports, foldable solar panels with monocrystalline cells, IPX4 water resistance, built-in smart charging technology for device compatibility, overcharge/overcurrent protection, and a compact, rugged design for outdoor use. 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. Charging Operation 8. Safety Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Foldable solar panels, USB-C output port, USB-A output port, Power Indicator LED, Carrying handle, Kickstand.

Feature	Description
Solar Panels	Monocrystalline cells with high conversion efficiency
USB-C Output	Up to 20W PD (Power Delivery) for fast charging
USB-A Output	Standard 5V/2.4A output for legacy devices
Power Indicator LED	Shows charging status and power output level
Carrying Handle	Integrated for easy transport
Kickstand	Adjustable angle for optimal sun exposure
Foldable Design	Compact storage when not in use
Smart Charging	Auto-detects device for optimal charging current
Protection Circuits	Over-current, over-voltage, short-circuit protection
Water Resistance	IPX4 rated for splash resistance

Installation

Unpack and inspect contents. Ensure all components are present.

Unfold solar panels: Open all panels fully until they lock into place.
Position for sunlight: Place on stable surface with kickstand adjusted for direct sun exposure.
Connect devices: Use provided USB cables to connect devices to USB-C or USB-A ports.
Check indicator: Verify Power Indicator LED illuminates to confirm solar charging.

WARNING! Do not look directly at the sun or reflective surfaces. Keep away from children and pets.

First-Time Setup

Position in direct sunlight; connect your device.

Unfold panels: Ensure all panels are fully extended and facing the sun.
Connect device: Use appropriate USB cable to connect smartphone, tablet, or power bank.
Monitor charging: Check device screen or Power Indicator LED for charging status.
Optimize angle: Adjust kickstand throughout the day for maximum sun exposure.

CAUTION! Avoid shading on panels; even partial shade significantly reduces output.

Specifications

Maximum Output: 20W.
Cell Type: Monocrystalline silicon.
Output Ports: USB-C (PD 3.0), USB-A (QC 3.0).
Open Circuit Voltage: 12V.
Operating Temperature: -10°C to 60°C.
Folded Dimensions: 28 x 20 x 3 cm.
Unfolded Dimensions: 28 x 60 x 1 cm.
Weight: 450g.
Water Resistance: IPX4.
Compatible Devices: Smartphones, tablets, power banks, GPS devices.

Controls and Settings

Simple operation with automatic settings. Power Indicator LED shows status: Solid Green (charging), Blinking Green (low sunlight/partial shade), Red (error/fault).

No physical buttons: Charging starts automatically when device is connected and sufficient sunlight is available.

Smart Charging: Automatically negotiates optimal voltage/current with connected device. Protection: Built-in circuits prevent damage from over-current, over-voltage, and short circuits.

Connecting Devices

Use high-quality USB cables for best performance.

Ensure panels are in direct sunlight.
Connect your device using appropriate USB cable to either USB-C or USB-A port.
Check device charging indicator to confirm charging has begun.
For multiple devices, connect one at a time for optimal power distribution.

Tip: For fastest charging, use USB-C port with PD-compatible devices.

Charging Operation

Optimize charging with proper positioning.

Sunlight requirement: Direct, unobstructed sunlight provides maximum output.
Angle adjustment: Change panel angle every 2-3 hours to follow sun's position.
Monitoring: Check Power Indicator LED - solid green indicates optimal charging.
Charging time: Varies based on sunlight intensity and device battery capacity.
Multiple devices: Charge one device at a time for fastest results.
Storage: Fold panels when not in use to protect solar cells.

WARNING! Do not attempt to charge devices while they are in use for intensive tasks (gaming, video recording).

Safety Features

Built-in protection: Over-current, over-voltage, short-circuit, and reverse current protection. Temperature monitoring: Reduces output if panels overheat. Water resistance: IPX4 rating protects against splashes from any direction.

Care & Cleaning

Keep solar panels clean for maximum efficiency. Use soft, dry cloth to wipe panels. For stubborn dirt, use damp cloth with mild soap solution, then dry immediately.

CAUTION! Do not use abrasive cleaners or solvents. Do not submerge in water despite IPX4 rating.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. CE certified for European market. RoHS compliant. Copyright © 2025 Otonohm; all trademarks property of Otonohm Technologies. For support, visit www.otonohm.com or contact 1-800-555-OTON.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No charging output	Insufficient sunlight	Move to direct sunlight; remove any shadows on panels.
LED blinking green	Low sunlight conditions	Reposition for better sun exposure; wait for stronger sunlight.
LED solid red	Overheating or fault	Move to cooler location; disconnect devices for 10 minutes.
Slow charging	Dirty panels or poor angle	Clean panels with soft cloth; adjust angle toward sun.
Device not recognized	Faulty cable or port	Try different USB cable; try other port.
Reduced output over time	Panel degradation	Normal after years of use; ensure panels are clean.

Reset: Disconnect all devices, fold and unfold panels, reconnect.

Service: 1-800-555-OTON; www.otonohm.com/support