Renogy E.FLEX 21 User Manual

The Renogy E.FLEX 21 is a 21-watt portable, flexible monocrystalline solar panel designed for off-grid power applications. It features high-efficiency solar cells, a durable ETFE laminate surface, lightweight and bendable design (up to 30 degrees), waterproof IP67 rating, integrated kickstand, and MC4 connectors for easy setup. Ideal for charging 12V batteries, powering small appliances, RVs, boats, camping, and emergency backup. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Flexible Monocrystalline Solar Panel, MC4 Connectors, Integrated Kickstand, ETFE Laminate Surface, Junction Box with Bypass Diodes.

Installation

Unpack and inspect contents. Ensure all components are present and undamaged.

1. Choose Location: Select a flat, clean surface with maximum sunlight exposure. Avoid shading.
2. Position Panel: Unfold the panel. Use the integrated kickstand to adjust the tilt angle (approx. 30-45 degrees towards the sun is optimal).
3. Secure (Optional): For permanent mounting, use adhesive backing or mounting holes (if applicable). Do not overtighten or puncture the flexible surface.
4. Route Cables: Keep cables away from sharp edges and heat sources.

WARNING! Do not install near flammable materials or in areas prone to standing water beyond IP67 rating. Do not walk on or place heavy objects on the panel.

First-Time Setup

Connect the panel to your power system correctly to begin generating electricity.

1. Connect to Charge Controller (CRITICAL): Always connect the solar panel to a compatible charge controller before connecting to a battery. Connect panel's MC4 connectors to the charge controller's solar input terminals (Observe polarity: Red+/Black-).
2. Connect Charge Controller to Battery: Connect the charge controller's battery terminals to your 12V battery (Observe polarity).
3. Connect Load (Optional): Connect your DC appliance to the load terminals of the charge controller, if supported.
4. Verify Operation: Place the panel in direct sunlight. The charge controller display should indicate charging status.

CAUTION! Never connect the solar panel directly to a battery without a charge controller, as this can cause overcharging, battery damage, or fire.

Specifications

• Maximum Power (Pmax): 21W
• Open Circuit Voltage (Voc): 21.6V
• Short Circuit Current (Isc): 1.23A
• Optimum Operating Voltage (Vmp): 18.0V
• Optimum Operating Current (Imp): 1.17A
• Maximum System Voltage: 600VDC (UL Listed)
• Fuse Rating: 10A (Recommended in series)
• Power Tolerance: ±3%
• Series Fuse Rating: 10A
• Storage Temperature: -40°F to 185°F (-40°C to 85°C)

Controls and Connections

The panel itself has no active controls. Power management is handled by the external charge controller.

Panel Connections: MC4 Connectors (Male and Female). Red connector is positive (+), Black connector is negative (-).

Charge Controller Settings (Typical): Must be configured for your battery type (e.g., Sealed, Gel, AGM, Lithium). Refer to your charge controller's manual for voltage set points (Absorption, Float, Equalization). Ensure controller is rated for the panel's Voc (21.6V) and system voltage (12V).

Connecting to Power Systems

Connecting to a 12V Battery System via a Charge Controller.

1. Series Connection (for higher voltage): Connect the MC4 male connector of one panel to the female connector of the next. Final open male/female connectors go to the charge controller. Do not exceed charge controller max input voltage.
2. Parallel Connection (for higher current): Use branch connectors (Y-adapters) to combine positive leads and negative leads separately, then connect to the charge controller. Use fuses on each parallel branch.
3. To a Power Station: Many portable power stations have a DC solar input. Use an MC4 to DC5521/7909 adapter cable if needed, and connect directly, as the station has a built-in charge controller.

Tip: Always disconnect the panel from the system by unplugging the MC4 connectors before performing any maintenance on wiring or batteries.

Operation & Performance

For optimal performance and energy harvest.

1. Sunlight: Output is directly proportional to sunlight intensity. Clean the surface regularly.
2. Angle: Adjust the kickstand seasonally. Tilt angle equal to your latitude is a good yearly average.
3. Temperature: Voltage decreases as panel temperature increases. Performance is rated at 77°F (25°C).
4. Monitoring: Monitor your charge controller for charging status, battery voltage, and input power.
5. Expected Output: Under ideal conditions, a 21W panel can produce roughly 70-100 Watt-hours per day, depending on location and season.

WARNING! The panel produces voltage whenever exposed to light, even on cloudy days. Treat connectors as live. Do not short-circuit the MC4 connectors.

Safety Features

Bypass Diodes: Integrated in the junction box to minimize power loss if part of the panel is shaded, preventing hot spots.
IP67 Rating: Protects against dust ingress and temporary immersion in water (up to 1 meter for 30 minutes).
ETFE Coating: Provides UV resistance and protects cells from environmental damage.

Care & Maintenance

Unplug the panel from the system before cleaning. Use a soft, damp cloth with mild soap and water to clean the surface. Rinse with clean water. Do not use abrasive materials, solvents, or high-pressure water.

Storage: Store in a cool, dry place away from direct sunlight when not in use for extended periods. Store flat or rolled loosely (do not crease sharply).

CAUTION! Do not attempt to open or repair the junction box. Do not puncture, cut, or modify the panel laminate. Inspect cables and connectors regularly for damage.

Regulatory Information

This product complies with relevant safety standards. It is UL 1703 Listed (USA). FCC Part 15: Class B digital device; complies with interference limits. Copyright © Renogy. All trademarks are property of Renogy. For support, visit www.renogy.com or contact [email protected] or 1-909-287-7111.

Troubleshooting

Reset: Disconnect panel and battery from charge controller for 5 minutes, then reconnect in correct order (Battery first, then Solar).

Service: 1-909-287-7111; [email protected]; www.renogy.com