Morningstar SunSaver Series Morningstar SunSaver 20A 24V Solar Charge Controller Model SS-20L-24V | Advanced PWM | Hazardous Location Certified The Morningstar SunSaver 20A 24V Solar Charge Controller (Model SS-20L-24V) is a highly reliable, third-generation PWM (Pulse Width Modulation) controller designed for robust off-grid solar power systems. Engineered by Morningstar, a world-leading supplier, this controller is built to extend battery capacity and life while maximising energy production in diverse applications. Ideal for demanding environments, the SunSaver SS-20L-24V features epoxy encapsulation, an anodised aluminium case, and marine-rated terminals, providing exceptional protection against humidity, dust, and corrosion. Its proven design ensures consistent high performance and durability, making it a trusted choice for critical solar installations globally. KEY CERTIFICATION: Certified for Class 1, Division 2 Hazardous Locations, suitable for oil, gas, and mining environments. Key Features ▶ PWM 4-Stage Charging — Extends battery life and maximises energy yield through intelligent charging. ▶ Low Voltage Disconnect (LVD) — Automatically protects batteries from deep discharge, enhancing longevity. ▶ Hazardous Location Certified — Approved for demanding industrial environments such as oil and gas. ▶ Epoxy Encapsulated Design — Ensures superior durability against humidity, dust, and extreme temperatures. ▶ Dead Battery Recovery — Capable of resuming charging even from a battery discharged to 1V. ▶ Automatic Load Control — Manages power to connected loads based on real-time battery condition. ▶ Marine-Rated Terminals — Prevents corrosion, ensuring reliable connections in humid or salty conditions. ▶ Extremely High Reliability — Features a 100% solid-state, series design for cool operation and longevity. Technical Specifications Parameter Value Nominal Battery Voltage 24V Rated Charging Current 20A Rated Load Current 20A Max. PV Open Circuit Voltage 60V Min. Battery Voltage for Recovery 1V Self-Consumption < 8mA Operating Temperature -40°C to +60°C Humidity 100% non-condensing Enclosure Rating IP10 (Indoor) Dimensions (L x W x D) 152 x 55 x 32 mm Weight 0.23 kg (230g) Charging & Battery Modes Feature Description / Value Charging Technology PWM (Pulse Width Modulation) Charging Stages 4-Stage (Bulk, Absorption, Float, Equalize) Compatible Battery Types Sealed Lead-Acid, Flooded Lead-Acid, NiCd Regulation Voltage (Sealed) 28.2V Regulation Voltage (Flooded) 28.8V Low Voltage Disconnect (LVD) 23.0V LVD Reconnect Voltage 25.2V Temperature Compensation Automatic (-60mV/°C/24V) Typical Applications Application Description Motorhomes & Caravans Provides reliable power management for leisure vehicles and mobile applications. Boats & Marine Systems Corrosion-resistant design and marine-rated terminals ensure durability in demanding marine environments. Oil & Gas Installations Certified for hazardous locations (Class 1, Division 2), ensuring safe and reliable operation in critical industrial settings. Telecom & Instrumentation Delivers stable and clean power for sensitive electronic equipment and remote telecommunication sites. Off-Grid & Remote Homes A durable and dependable solution for standalone solar power systems in remote residential applications. Built-In Protection Functions The Morningstar SunSaver 20A 24V controller incorporates a comprehensive suite of electronic protections to safeguard your system and ensure long-term reliability. These include: overload protection • short circuit protection • high voltage protection • reverse polarity protection • high temperature protection • lightning and transient surge protection (1500W per connection) • reverse current at night protection. Common Questions What types of batteries can this controller charge? The Morningstar SunSaver SS-20L-24V is compatible with sealed lead-acid, flooded lead-acid, and NiCd batteries. It offers field-selectable settings to optimise charging for these battery types. Is this controller suitable for harsh outdoor environments? Yes, this controller is specifically designed for harsh conditions. It features epoxy encapsulation, an anodised aluminium case, and marine-rated terminals for protection against humidity, dust, and corrosion. It is also certified for hazardous locations (Class 1, Division 2). What is Low Voltage Disconnect (LVD) and how does it work? Low Voltage Disconnect (LVD) is a critical feature that automatically disconnects loads from the battery when its voltage drops to 23.0V. This prevents deep discharge, which can severely damage batteries and shorten their lifespan. The controller will automatically reconnect the loads once the battery has recharged to 25.2V. Installation Notes Ensure your battery bank is a 24V nominal system to match the controller. Always connect the battery to the controller first, then the solar array, and finally any loads. Mount the controller in a well-ventilated area, protected from direct sunlight and excessive heat. Refer to the manufacturer's instruction manual for detailed wiring diagrams and safety guidelines. Use appropriate wire gauges for all connections to minimise voltage drop and prevent overheating. Before You Buy Verify that your solar panel array's open-circuit voltage (Voc) does not exceed 60V. Confirm your battery bank's voltage and type are compatible with this 24V PWM controller. Calculate your total load current to ensure it does not exceed the controller's 20A rating. For complex or critical applications, it is always recommended to consult with a qualified solar installer. Check the physical dimensions of the controller to ensure it fits your intended mounting location. Please verify all specifications and compatibility requirements with your system design prior to purchase. This product is covered by a 5-year manufacturer warranty.
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