The Reliance SG-720 is a high-frequency industrial battery charger designed for deep-cycle flooded lead-acid batteries. It is optimized for specific battery configurations, including Trojan 6 x T-105 (36V), 6 x T-875 (48V), or 4 x T-1275 (48V), depending on the model. Using this charger with other battery types may cause damage, injury, fire, or explosion, and could void warranties.
Function Description:
The SG-720 charges lead-acid batteries by converting AC input power to DC output power. It features an LED indicator that displays the charging status and identifies faults. The charger automatically starts when connected to a battery and terminates charging once the batteries reach a 100% state of charge, indicated by a solid green LED light. After completing a charge cycle, it enters a float charge mode, continuously monitoring battery voltage and reactivating charging if the state of charge drops to 80% or after 30 days, whichever comes first.
Important Technical Specifications:
- AC Input Voltage Range: 90-120 VAC (45-65 Hz)
- AC Input Max Current: 8.0A @ 100VAC
- Power Factor: >0.98
- Efficiency: >94.0%
- Noise: <50dB
- IP (Ingress Protection) Rating: IP65
- Operating Temperature: -22 °F to 149 °F (-30 °C to 65 °C)
- Storage Temperature: -40 °F to 176 °F (-40 °C to 80 °C)
- Altitude: 0-6500 feet (0-1981 meters)
- Humidity: 5% to 95%
- Dimensions (L x W x H): 10.6 in x 6.2 in x 3.2 in (26.9 cm x 15.7 cm x 8.1 cm)
- Height with Handle: 4.5 in (11.4 cm)
- Weight: 7.5 lbs (3.4 kg)
- AC Cord Length: 8 ft (2.4 m)
- DC Cord Length: 8 ft (2.4 m)
Built-In Safety Features:
- Over Temperature Protection: Decreases power output if temperatures exceed normal operating ranges. If the charger exceeds 149°F (65°C), it automatically stops charging and enters standby mode until temperatures normalize.
- Reverse Polarity Protection: Automatically shuts down if batteries are connected improperly to prevent damage.
- No Load Protection: Provides zero output when the DC paddle is disconnected.
- Short Circuit Protection: Automatically shuts down if a short circuit is detected and resumes normal charging once rectified.
- Auto Shut Down: Automatically shuts down and provides zero DC output with a solid green light when batteries are fully charged.
Usage Features:
- Mounting: The charger has four mounting holes and two hanger holes in its aluminum base, allowing for multiple configurations. It is recommended to use 1/4 - 20 nuts and bolts for secure mounting. Screws are not recommended. The center holes can be used with a securely mounted hook.
- Preferred Orientations: Horizontally flat with the fan (handle) facing upwards without obstruction, vertically with AC/DC cords facing up or down, or side-mounted with AC/DC cords facing left or right.
- Non-Preferred Orientation: Horizontally mounted with the fan (handle) facing the ground.
- Installation Note: Always mount the charger to a non-combustible surface (metal, brick, concrete) and ensure at least 3 inches of space around the fan for cooling.
- Operation Steps:
- Connect the AC power cord to a 3-prong grounded wall outlet before connecting the DC paddle to the vehicle. The LED indicator will flash red/green repeatedly.
- Insert the DC paddle into the vehicle's charger receptacle. The fan will turn on, and the LED will flash red/green while determining battery capacity and ambient temperature (up to 90 seconds).
- The charger will automatically start, and the LED will indicate the state of charge.
- To disconnect during a charge cycle, first unplug the AC power cord from the wall outlet, then remove the DC paddle from the vehicle.
- Charging terminates automatically when batteries are full (solid green LED).
- Before driving, firmly grasp and pull the DC charger paddle straight out of the receptacle.
- Unplug the charger from the AC wall outlet if not frequently used.
- Store the charger in a safe place when not in use.
- Charging Status Indicators:
- Red flash, pause for 3 seconds: Charging 0%-19%
- Red flash, pause for 1 second: Charging 20%-79%
- Yellow flash, pause for 1 second: Charging 80%-99%
- Solid green light: Charged 100%
- Red-green flash: Idle, Precharge Diagnostics, or Error (refer to fault table for details).
- DC Output Polarity: The BLACK DC cable must connect to the battery negative (-), and the WHITE or RED DC cable to the battery positive (+). The charger will not operate if polarity is reversed.
- Vehicle Interlock: The SG-720 does not activate vehicle charger interlock features. Always disconnect the DC paddle before moving the vehicle.
Maintenance Features:
- Cleaning: If cleaning is required, always ensure the DC charger paddle is disconnected from the golf cart charging port and the AC cord is unplugged from the wall outlet. Use a slightly damp, soft cloth to clean the charger. Never use cleaning solvents.
- Ventilation: Always use the charger in a well-ventilated area to prevent the buildup of explosive hydrogen gas from lead-acid batteries.
- Fault Resolution: The manual provides an LED flash pattern guide for various faults (No-Load, Over-Voltage/Current, Over/Under Temperature, Charger Overheat, Charger Under-Voltage, Input AC Abnormal) with corresponding resolutions. If issues persist after troubleshooting, contact technical support. Do not continue to use a malfunctioning charger.
Safety Precautions:
- Read all instructions and warning labels before use.
- Always disconnect the charger handle from the vehicle and unplug AC power before servicing the vehicle.
- Never touch uninsulated portions of connectors or battery terminals.
- Ensure all electrical connectors are in good working condition; do not use damaged connectors.
- Do not disassemble, modify, or service the charger. Service must be performed by a qualified technician. Disassembly voids the warranty.
- Connect to a properly grounded 3-wire outlet. Do not modify the AC cord.
- Extension cords are not recommended, but if used, must be a 3-wire grounded cord of at least 14AWG and less than 25 ft long.
- Do not use near flammable materials or vapors.
- Always install or use on a non-combustible surface.
- Lead-acid batteries generate hydrogen gas; never smoke near batteries or allow conductive objects to connect across terminals.
- Ventilate enclosed areas during charging.
- Wear eye/face protection and protective gloves when working with batteries due to sulfuric acid.
- Never charge a frozen or non-rechargeable battery.
- Keep cell phones away from batteries during charging to avoid sparks.
- Ensure the vehicle's battery system matches the charger's specifications (voltage/cell count/amp hour capacity, flooded lead-acid type).
- Do not operate if the charger has physical damage, has been dropped, or received a sharp blow.
- This charger is not intended for use as an on-board charger. Modifying it for on-board use will void warranties.
Compliance:
The product meets UL1012:2010 R4.16, DOE 10 CFR Part 430, CAN/CSA-C22.2 No.107.2-01+GI1+GI2 (R2016), and CEC 400-2017-002 standards. It also complies with Electromagnetic Compatibility Directive 2014/30/EU, FCC Part 15, and Industry Canada's ICES 003 for a Class A digital device. It is designed not to cause harmful electromagnetic interference and must accept any received interference.
Warranty:
The Reliance SG-720 comes with an 18-month limited warranty, non-transferable to the original end user. Coverage starts from the purchase date. Manufacturer's defects within this period will result in a full replacement charger at no cost, excluding shipping.
- Exclusions: Commercial or rental use, normal wear and tear (including minor cosmetic damage), damages from accident, misuse, or modification.
- The purchaser is responsible for regular maintenance and replacement parts outside the warranty scope, and for determining compatibility with their vehicle charging application.
Product Recycling/Disposal:
End users must comply with relevant local laws and regulations for recycling or disposing of the charger.
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