Morningstar SunSaver Series Morningstar SunSaver SS-20L-12V Solar Charge Controller 20A PWM | 12V System | Hazardous Location Certified The Morningstar SunSaver SS-20L-12V is a highly reliable 20 Amp, 12 Volt Pulse Width Modulation (PWM) solar charge controller, engineered for demanding off-grid applications. This third-generation SunSaver controller is renowned for its exceptional reliability and robust performance, having been installed in over 73 countries globally. Designed to protect and optimise battery life, the SS-20L-12V features advanced charging algorithms and comprehensive electronic protections. Its durable, epoxy-encapsulated design with marine-rated terminals makes it an ideal choice for harsh environments, including marine, motorhome, industrial, and hazardous locations. HAZARDOUS LOCATION RATED: Certified for Class 1, Division 2, Groups A,B,C,D and ATEX/IECEx Zone 2 for safe operation in challenging environments. Key Features ▶ Advanced PWM Charging — Optimises battery charging for extended life and performance. ▶ Automatic Load Control (LVD) — Disconnects loads at low battery voltage (11.5V) to prevent deep discharge. ▶ Epoxy Encapsulated Design — Provides superior protection against humidity, dust, and harsh conditions. ▶ Marine-Rated Terminals — Ensures corrosion resistance and durability in marine environments. ▶ Wide Operating Temperature — Functions reliably from -40°C to +60°C. ▶ Dead Battery Recovery — Can initiate charging even from a deeply discharged battery (as low as 1V). ▶ High Reliability — Solid-state design with a low failure rate for long-term performance. ▶ Simple Installation — Factory pre-sets and fully automatic operation for ease of use. Technical Specifications Parameter Value Nominal Battery Voltage 12V Rated Charging Current 20A Rated Load Current 20A Max. Solar Input Voltage (Voc) 30V Battery Compatibility Sealed, Flooded Lead-Acid, NiCd Self-Consumption < 8mA Operating Temperature -40°C to +60°C Enclosure Rating IP10 Dimensions (L x W x D) 152 x 55 x 32 mm Weight 230 g Charging & Battery Modes The Morningstar SunSaver SS-20L-12V employs a sophisticated Pulse Width Modulation (PWM) charging algorithm to ensure optimal battery health and longevity. It is compatible with both sealed and flooded lead-acid batteries, as well as NiCd battery types, offering flexibility for various system designs. A key feature is its Low Voltage Disconnect (LVD) function, which automatically disconnects the load when the battery voltage drops to 11.5V, preventing damaging deep discharges. The load automatically reconnects when the battery recovers to 12.6V. The controller also includes a dead battery recovery function, capable of initiating charging even when a battery is discharged to as low as 1V. For sensitive loads and instrumentation, the SunSaver offers specific settings, including a slow switching charging mode, making it suitable for telecommunications and other critical applications. Typical Applications Application Description Motorhomes & Caravans Reliable power management for leisure vehicles. Boats & Marine Systems Durable and corrosion-resistant for harsh marine environments. Oil & Gas Installations Certified for hazardous locations, ensuring safety and performance. Telecom & Instrumentation Stable power for sensitive electronic equipment. Off-Grid & Remote Homes Essential battery protection for standalone solar power systems. Built-In Protection Functions The Morningstar SunSaver SS-20L-12V is equipped with a comprehensive suite of electronic protection features to safeguard your solar system components. These include protection against: overload • short circuit • high voltage • reverse polarity • high temperature • lightning and transient surges • and reverse current at night. Its robust design and certifications ensure reliable operation even in challenging conditions. Common Questions What battery types are compatible with this controller? The Morningstar SunSaver SS-20L-12V is compatible with 12V sealed and flooded lead-acid batteries. It also supports NiCd battery chemistries. Can this controller be used in harsh or hazardous environments? Yes, the SS-20L-12V is specifically designed for harsh environments. It is epoxy encapsulated and features marine-rated terminals. It is also certified for hazardous locations (Class 1, Division 2, Groups A,B,C,D and ATEX/IECEx Zone 2). What is the Low Voltage Disconnect (LVD) feature? The LVD feature automatically disconnects the connected load from the battery when the battery voltage drops to 11.5V. This prevents the battery from being over-discharged, which can significantly shorten its lifespan. The load automatically reconnects when the battery voltage recovers to 12.6V. How does the controller protect my solar system? The controller provides comprehensive protection against common electrical faults, including overcharge, short circuit, reverse polarity, high temperature, and transient surges. It also prevents reverse current flow from the battery to the solar panels at night. Installation Notes Installation should be performed by a qualified professional in accordance with local electrical regulations. Ensure correct wiring polarity for solar input, battery, and load connections to prevent damage. Always connect the battery to the controller first, then the solar panels, and finally the load. Mount the controller in a location that allows for adequate air circulation and is protected from direct sunlight and extreme temperatures. Verify that the total solar panel array power and current do not exceed the controller's maximum ratings. Before You Buy Confirm your system voltage is 12V to match this controller. Check your total solar panel array current and ensure it does not exceed 20A. Verify your battery type (sealed, flooded lead-acid, or NiCd) is compatible. Consider the environmental conditions of your installation location; this controller is rated IP10 for indoor use. Review the full specifications to ensure compatibility with all components of your solar power system. Please verify all specifications and compatibility requirements before purchase. Professional installation is recommended. This product is covered by a 5-year manufacturer warranty.
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