Renogy Core LT (Low Temperature) Series

Before Getting Started

The user manual provides important operation and maintenance instructions for the Renogy Core LT (Low Temperature) Series 48V 50Ah Deep Cycle Lithium Iron Phosphate Battery (hereinafter referred to as battery).

Read the user manual carefully before operation and save it for future reference. Failure to observe the instructions or precautions in the user manual can result in electrical shock, serious injury, or death, or can damage the battery, potentially rendering it inoperable.

• Renogy ensures the accuracy, sufficiency, and the applicability of information in the user manual at the time of printing due to continual product improvements that may occur.
• Renogy assumes no responsibility or liability for personal and property losses, whether directly and indirectly, caused by the user's failure to install and use the product in compliance with the user manual.
• Renogy is not responsible or liable for any failure, damage, or injury resulting from repair attempts by unqualified personnel, improper installation, or inappropriate operation.
• The illustrations in the user manual are for demonstration purposes only. Details may appear slightly different depending on product revision and market region.
• Renogy reserves the right to change the information in the user manual without notice. For the latest user manual, visit renogy.com.

Disclaimer

Renogy Core LT (Low Temperature) Series 48V 50Ah Deep Cycle Lithium Iron Phosphate Battery User Manual © 2024 Renogy. All rights reserved.

RENOGY and RENOGY are registered trademarks of Renogy.

• All information in the user manual is subject to copyright and other intellectual property rights of Renogy and its licensors. The user manual may not be modified, reproduced, or copied, in whole or in part, without the prior written permissions of Renogy and its licensors.
• The registered trademarks in the user manual are the property of Renogy. The unauthorized use of the trademarks is strictly prohibited.

Online Manual

User Manual

Symbols Used

The following symbols are used throughout the user manual to highlight important information.

⚠️ WARNING: Indicates a potentially dangerous condition which could result in injury or death.

⚠️ CAUTION: Indicates a critical procedure for safe and proper installation and operation.

ℹ️ NOTE: Indicates an important step or tip for optimal performance.

Introduction

The Renogy Core LT (Low Temperature) Series 48V 50Ah Deep Cycle Lithium Iron Phosphate Battery is designed for the drop-in replacement of deep-cycle lead-acid batteries with its smaller size.

Weighing only half of the lead-acid counterparts, the battery can be safely discharged to 100% Depth of Discharge (DOD), delivering twice the energy. Manufactured with automotive grade battery cells, the battery features the highest safety standards and an extended 6000+ cycle life. In addition, the Smart Battery Management System (BMS) provides comprehensive protection to the battery.

Key Features

• Unparalleled Performance: Features a greater energy density, a deeper discharge capability, a higher round-trip efficiency, and a faster charging speed in a smallest size over counterparts in the market.
• Uncompromising Quality: Ensures an exceptional lifespan with more than 6000 cycles (80% DOD), a continuous charge current of 50A and a continuous discharge current of 50A, and a wide range of operating temperatures with the automotive grade battery cells.
• Reliable Protection Mechanisms: Designed with a sturdy internal structure for RV use, and includes multiple levels of protection such as low temperature cut-off and precise balancing through the battery management system.
• Intelligent Self-heating Function & More Stable Performance: The built-in heater operates automatically at low temperatures to keep the battery charging, assuring charging performance at low temperature and increasing battery lifespan.
• Easy to Expand: It supports up to 16 batteries in parallel, delivering a maximum of 48V 800Ah at 38.4kWh.

SKU

What's In the Box?

The package includes:

• Renogy Core LT (Low Temperature) Series 48V 50Ah Deep Cycle Lithium Iron Phosphate Battery x 1
• User Manual x 1
• Insulating Sleeve x 2
• Long Terminal Bolt x 2

[Image of Renogy Core LT Battery, User Manual, Insulating Sleeves, and Long Terminal Bolts]

ℹ️ NOTE: Make sure that all accessories are complete and free of any signs of damage.

Required Tools & Accessories

Prior to installing and configuring the battery, prepare the recommended tools, components, and accessories.

• Wrench (9/16 inches)
• Battery Adapter Cables x 2
• Insulating Gloves
• Multimeter

[Image of a 14mm wrench]

[Image of M8 Battery Adapter Cables]

[Image of Insulating Gloves]

[Image of a Multimeter]

ℹ️ NOTE: For how to size battery adapter cables, refer to "How to Size Battery Adapter Cables?" in this manual.

Get to Know Deep Cycle Lithium Iron Phosphate Battery

[Diagram showing the Renogy Core LT battery with labels pointing to the Negative Terminal (M8), Positive Terminal (M8), and Lift Handles.]

Dimensions

[Diagram showing the dimensions of the Renogy Core LT battery: 15.1 in (384 mm) length, 9.8 in (248 mm) height, and 7.6 in (195 mm) width.]

Dimension tolerance: ±0.2 in (0.5 mm)

How to Size Battery Adapter Cables?

Use appropriately sized Battery Adapter Cables (sold separately) based on expected load. Refer to the table below for copper cable ampacities with different gauge sizes.

ℹ️ NOTE: The above values are from the NEC Table 310.17 for copper cables rated at 194°F (90°C), operating at an ambient temperature of no more than 86°F (30°C). Cables longer than 13 feet (4000 mm) may require thicker gauge wires to prevent excessive voltage drop in undersized wiring.

Fix the Battery to a Position (Optional)

Securing the battery prevents damage to the battery from loose cables and bumps.

Recommended Components

• Battery Tray
• Tie Down Strap
• Mounting Screws × 4

[Diagram showing a battery tray, tie-down strap, and mounting screws.]

[Diagram illustrating how to secure the battery using a tie-down strap.]

ℹ️ NOTE: Alternative mounting methods are allowed to meet the requirements of specific applications.

Step 1. Plan a Mounting Site

For optimal battery performance, it is recommended to install the battery in a clean, cool, and dry location, free from any accumulation of water, oil, or dirt. Accumulation of such materials on the battery can lead to current leakage, self-discharge, and even short-circuiting.

[Diagram showing air cross-flow within an enclosed space with vents, illustrating proper ventilation for the battery.]

[Keep Dry Symbol] [Fragile Symbol] [Ventilation Symbol]

Charge: -4°F-131°F / -20°C-55°C

Discharge: -4°F-140°F / -20°C-60°C

Humidity: 10%-95%

ℹ️ NOTE: Sufficient air flow must be provided to prevent excessive heat build-up and to minimize temperature variation between the connected batteries. This user manual takes a battery as an example to illustrate how to install the battery.

Step 2. Wear Insulating Gloves

[Image of a Renogy Core LT battery and a pair of orange insulating gloves.]

Step 3. Remove the Dust Cover

[Diagram showing the removal of terminal dust covers from the Renogy Core LT battery.]

Step 4. Check the Battery

Inspect the battery for any visible damage including cracks, dents, deformation, and other visible abnormalities. All connector contacts shall be clean, free of dirt and corrosion, and dry.

⚠️ DO NOT touch the exposed electrolyte or powder if the battery is damaged.

⚠️ If uncovered electrolyte or powder contacts your skin or eyes, flush it out immediately with plenty of clean water and seek medical attention.

Step 5. Run the Battery Adapter Cables Through the Insulating Sleeves

[Diagram showing battery adapter cables being threaded through insulating sleeves.]

Step 6. Install Battery Terminals

[Diagram illustrating the connection of battery adapter cables to the battery terminals using long terminal bolts, spring washers, and flat washers. Torque specification of 10 N·m is indicated.]

Ensure the cable lug and the top surface of the terminal are in contact, and place the washers on top of the lug. Do not place the washers between the battery terminal and the cable lug to avoid high resistance and excessive heating.

⚠️ Avoid short-circuiting the battery terminals to prevent irreversible damage to the system and battery caused by current bursts.

⚠️ Verify polarity before wiring to avoid irreversible battery damage due to polarity reversal.

ℹ️ NOTE: To ensure safe and reliable operation of the system, please follow the manufacturer's recommended torque specifications when securing cable connections. Over-tightening can result in terminal breakage, while loose connections can lead to terminal meltdown or fire. When securing multiple cable lugs on a single battery terminal, use the included Long Terminal Bolts.

Step 7. Install the Insulating Sleeves

[Diagram showing insulating sleeves being placed over the connected battery terminals.]

Step 8. Connect the Battery to Other Devices

⚠️ Please use circuit breakers, fuses, or disconnects appropriately sized by a certified electrician, licensed installers, or regional code authorities to protect all electrical equipment.

For a Single Battery

[Diagram showing a single Renogy Core LT battery connected to an inverter, DC-DC converter, DC distribution panel, and charge controller via a battery fuse.]

For Batteries in Parallel

[Diagram showing multiple Renogy Core LT batteries connected in parallel to an inverter, DC-DC converter, DC distribution panel, and charge controller via a battery fuse.]

How to Connect Renogy Core Batteries in Parallel

Calculate Voltage and Current in Parallel Connections

[Diagram illustrating parallel connection with positive terminals connected together and negative terminals connected together.]

[Diagram showing four 48V 50Ah batteries connected in parallel to form a 48V 200Ah system.]

⚠️ Do not connect batteries with different chemistries, rated capacities, nominal voltages, brands, or models in parallel or in series. This can result in potential damage to the batteries and the connected devices, and can also pose safety risks.

⚠️ Avoid connecting batteries that have been purchased for more than half a year. Over time, batteries can degrade and their performance may decrease, which can affect their ability to deliver reliable power and may lead to safety hazards.

ℹ️ The cables between each connected battery should be of equal length to ensure that all batteries can work equally together.

ℹ️ You can connect up to 16 batteries in parallel.

Balance Batteries Prior to Connection

Before connecting batteries in parallel, it is important to balance them to reduce voltage differences and optimize their performance. Follow these three steps:

1. Step 1: Charge each battery individually to its full capacity using a suitable charger. [Diagram showing individual battery charging with a battery fuse and charge controller.]
2. Step 2: Use a voltmeter to measure the voltage of each battery. It is best to keep the voltage difference of each battery less than 0.2V. [Diagram showing a multimeter measuring the voltage of a battery.]
3. Step 3: Connect all the batteries in parallel and allow them to rest together for 12 to 24 hours. [Diagram showing batteries connected in parallel with a time indicator for 12-24h.]

ℹ️ It is recommended to periodically rebalance the battery voltages every six months when connecting multiple batteries as a battery system. Slight voltage differences can occur among batteries over time due to factors like battery chemistry, capacity, temperature, and usage patterns.

Parallel Connection – Installation Steps

ℹ️ You can choose suitable busbars in parallel connections. Busbars help handle high currents and are typically arranged in a parallel or stacked configuration to distribute electrical power efficiently.

ℹ️ Note that the cable connection methods provided below are for reference purposes only, as the optimal approach may vary depending on the specific situation. It is essential to consider various factors, such as the cable size, equipment used, and environmental conditions.

[Diagram showing a 2P (2 batteries in parallel) configuration.]

2P: Battery System 48V 100Ah, Energy 4800Wh

[Diagram showing a 16P (16 batteries in parallel) configuration.]

16P: Battery System 48V 800Ah, Energy 38400Wh

Battery Cell Balancing

The battery employs a bypass circuit to maintain the balance between each battery cell group. Each battery cell group is connected with a bypass resistor and a switch in parallel. During the charging process, if the highest-voltage battery cell group reaches the set balancing starting voltage and the voltage difference between the highest-voltage and the lowest-voltage battery cell group exceeds the set voltage difference, the switch connected to the highest-voltage battery cell group will be closed to shunt the charge current around the highest-voltage battery cell group through the bypass resistor until the voltage difference drops below the set value. To avoid excessive energy loss, the battery cell balancing is only performed during the charging process.

Charging/Discharging Parameter Settings

Charge

Discharge

ℹ️ NOTE: The parameters in the table are applicable to 48V (15 cells) battery packs.

Battery Charging and Discharging Logic

The battery may be received at a partial state of charge (SOC) depending on the time between manufacturing and shipping. It is crucial to fully charge the battery before its initial use. In case the battery shuts off due to low SOC, promptly disconnect it from loads and charge it to prevent irreversible damage. Follow the instructions in this user manual for proper charging and usage to ensure optimal battery performance and longevity.

Charging Logic

The standard charging process for the battery involves charging at a constant current of 50A until the battery voltage reaches 54V, followed by charging at a constant voltage of 54V while tapering the charge current. The charging process is considered complete when the charge current is less than 2.5A (also known as tail current).

The standard charging process typically takes 1.5 hours and requires battery temperatures to be between 32°F and 131°F (0°C and 55°C) for safe charging. Leaving the battery on float will continue to balance the battery cells without damaging the battery.

[Graph showing charging current (I/A) and voltage (U/V) over time. The graph depicts a constant current phase up to 50A, followed by a constant voltage phase at 54V, with current tapering down to 2.5A.]

ℹ️ Lithium batteries are compatible with various charging methods, including MPPT charge controller, AC charger, and DC-DC charger. The crucial parameter setting for these chargers is to set the charge voltage, boost voltage, or bulk voltage at 54V (±0.2V).

⚠️ Do not overcharge or overdischarge the battery.

⚠️ Do not discharge the battery at high temperatures above 140°F (60°C).

⚠️ Only charge the battery with a battery charger or charge controller that is compatible with lithium iron phosphate batteries.

⚠️ Do not exceed the maximum continuous charge current (50A) of the battery.

Discharging Logic

During standard discharging, the battery is discharged at a constant current of 50A until the voltage drops to 42V. To ensure safe discharging, the battery temperature should be between -4°F (-20°C) and 131°F (60°C).

ℹ️ To ensure safe and optimal battery usage, it is recommended to pair the battery with discharge equipment that features a low voltage disconnect (LVD) function.

⚠️ Do not connect large loads to the battery when it is running low.

⚠️ Do not exceed the maximum continuous discharge current (50A) of the battery.

How to Estimate the Battery SOC?

The SOC values listed below are estimated based on the resting voltage when the battery is at rest for 30 minutes, not in charging or discharging state.

ℹ️ NOTE: The table above is for reference only because slight variations in battery voltage may occur among different batteries.

Self-heating Function

The normal operation of the self-heating function requires a stable charge current greater than 3.5A for each battery in the parallel battery bank. The self-heating function will start at optimal performance once the battery temperature drops below 32°F (0°C) and stop operating automatically once the battery temperature rises above 41°F (5°C) with a full power of 200W.

Battery Management System

The battery is equipped with a Battery Management System (BMS) that provides warnings and protections against overvoltage, undervoltage, overcurrent, short circuit, high temperature, and low temperature conditions. Refer to the table below for the triggering and recovery conditions of each warning and protection.

Troubleshooting

For further assistance, contact Renogy technical support service at https://www.renogy.com/contact-us.

Specifications

General

Operation Parameters

Maintenance & Storage

Inspection

Please perform regular inspections following the steps below:

• Examine the external appearance of the battery. The housing and terminals of the battery shall be clean, dry, and free of corrosion.
• Check battery cables and connections. Replace any damaged cables and tighten any loose connections.

ℹ️ In certain application scenarios, corrosion may occur around the terminals. Corrosion can cause increased resistance and poor contact. It is recommended to regularly apply insulation grease to each terminal. Insulation grease can form a moisture-resistant seal and protect the terminals from corrosion.

Cleaning

Please clean the battery at regular intervals following the steps below:

• Disconnect the battery from the system.
• Clear the leaves and debris from the battery.
• Clean the battery with a soft, lint-free cloth. The cloth can be dampened with water or mild soap and water if the battery is extremely dirty.
• Dry the battery with a soft, lint-free cloth.
• Keep the area around the battery clean.
• Reconnect the battery to the system.

Checking Voltage

Please check the battery voltage periodically to assess battery health. If the battery is unable to be activated with a charge/discharge current greater than 1A or the battery is activated with a resting voltage below 37.5V, the battery may have been severely overdischarged due to self-discharge or parasitic loads. Please stop using the battery until the fault can be corrected and the battery can be charged.

Storage

Please follow the tips below to ensure that the battery emerges from storage in a good condition:

• Charge the battery to 30% to 50% SOC.
• Disconnect the battery from the system.
• Store the battery in a well-ventilated, dry, clean area with temperatures between -13°F (-25°C) and 149°F (65°C).
• Do not expose the battery to direct sunlight, moisture, or precipitation.
• Handle the battery carefully to avoid sharp impacts or extreme pressure on the battery housing.
• Charge the battery at least once every 3 to 6 months to prevent it from overdischarge.
• Fully charge the battery when it is taken out of storage.

Important Safety Instructions

The manufacturer accepts no liability for any damage caused by:

• Force majeure including fire, typhoon, flood, earthquake, war, and terrorism.
• Intentional or accidental misuse, abuse, neglect or improper maintenance, and use under abnormal conditions.
• Improper installation, improper operation, and malfunction of a peripheral device.
• Contamination with hazardous substances or radiation.
• Alterations to the product without express written consent from the manufacturer.

General

• Wear proper protective equipment and use insulated tools during installation and operation. Do not wear jewelry or other metal objects when working on or around the battery.
• Keep the battery out of the reach of children.
• Do not dispose of the battery as household waste. Comply with local, state, and federal laws and regulations and use recycling channels as required.
• In case of fire, put out the fire with a FM-200 or CO2 fire extinguisher.
• Do not expose the battery to flammable or harsh chemicals or vapors.
• Clean the battery regularly.
• It is recommended that all cables should not exceed 10 meters because excessively long cables result in a voltage drop.
• The cable specifications listed in the quick guide account for critical, less than 3% voltage drop and may not account for all configurations.
• Do not expose the battery to strong electrostatic fields, strong magnetic fields, or radiation.

Battery Safety

• Please keep the battery away from water, heat sources, sparks, and hazardous chemicals.
• Do not puncture, drop, crush, burn, penetrate, shake, strike, or step on the battery.
• Do not open, dismantle, repair, tamper with, or modify the battery.
• Do not touch any terminals or connectors.
• Please make sure any battery charger or charge controller has been disconnected before working on the battery.
• Do not connect or disconnect terminals from the battery without first disconnecting loads.
• Do not place tools on top of the battery.
• Please use suitable handling equipment for safe transportation of the battery.
• Do not insert foreign objects into the positive and negative terminals of the battery.

Renogy Support

To discuss inaccuracies or omissions in this quick guide or user manual, visit or contact us at:

• renogy.com/support/downloads
• contentservice@renogy.com

To explore more possibilities of solar systems, visit Renogy Learning Center at: renogy.com/learning-center

For technical questions about your product in the U.S., contact the Renogy technical support team through:

• renogy.com/contact-us
• 1(909)2877111

For technical support outside the U.S., visit the local website below:

FCC Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

1. Orient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
4. Consult the dealer or an experienced radio/TV technician for help.

FCC Radiation Exposure Statement

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.