Renogy Core LT (Low Temperature) Series 25.6V 100Ah Deep Cycle Lithium Iron Phosphate Battery

Before Getting Started

This user manual provides important operation and maintenance instructions for the Renogy Core LT (Low Temperature) Series 25.6V 100Ah Deep Cycle Lithium Iron Phosphate Battery (referred to as the battery). Please read the manual carefully before operation and save it for future reference. Failure to observe instructions or precautions can result in electrical shock, serious injury, or death, or damage to the battery.

• Renogy ensures the accuracy and applicability of information at the time of printing, subject to product improvements.
• Renogy is not responsible for losses caused by failure to install or use the product according to the manual.
• Renogy is not liable for issues arising from repairs by unqualified personnel, improper installation, or inappropriate operation.
• Illustrations are for demonstration purposes and may differ slightly based on product revision or market region.
• Renogy reserves the right to change manual information without notice. Visit renogy.com for the latest version.

Disclaimer

Renogy Core LT (Low Temperature) Series 25.6V 100Ah Deep Cycle Lithium Iron Phosphate Battery User Manual © 2023 Renogy. All rights reserved. RENOGY and the Renogy logo are registered trademarks of Renogy.

• All information is subject to copyright and intellectual property rights of Renogy and its licensors. Reproduction or copying without prior written permission is prohibited.
• Unauthorized use of registered trademarks is strictly prohibited.

Online Manual

Access the online manual for the latest information.

Symbols Used

The following symbols highlight important information:

• WARNING: Indicates a potentially dangerous condition that could result in injury or death.
• CAUTION: Indicates a critical procedure for safe and proper installation and operation.
• NOTE: Indicates an important step or tip for optimal performance.

Introduction

The Renogy Core LT (Low Temperature) Series 25.6V 100Ah Deep Cycle Lithium Iron Phosphate Battery is designed as a direct replacement for deep-cycle lead-acid batteries using the standard Battery Council International (BCI) group size. It weighs half as much as lead-acid counterparts, can be safely discharged to 100% Depth of Discharge (DOD), and delivers twice the energy. Manufactured with automotive-grade battery cells, it offers high safety standards and an extended 5000+ cycle life. The integrated Battery Management System (BMS) provides comprehensive protection.

Key Features

• Unparalleled Performance: Greater energy density, deeper discharge capability, higher round-trip efficiency, and faster charging in a smaller size.
• Uncompromising Quality: Over 5000 cycles (80% DOD) lifespan, 100A continuous charge/discharge current, and wide operating temperature range due to automotive-grade cells.
• Reliable Protection Mechanisms: Sturdy internal structure for RV use, with multiple protection levels including low temperature cut-off and smart BMS balancing.
• Intelligent High Power Self-heating Function: A 200W self-heating function allows charging at low temperatures.
• Easy to Expand: Supports system expansion up to 16 batteries (2 series, 8 parallels) for a maximum of 48V (51.2V) 800Ah or 40.96 kWh.

SKU

What's In the Box?

The package includes:

• Renogy Core LT (Low Temperature) Series 25.6V 100Ah Deep Cycle Lithium Iron Phosphate Battery × 1
• User Manual × 1
• Insulating Sleeve × 2
• Long Terminal Bolt × 2

NOTE: Ensure all accessories are complete and free of any signs of damage.

Required Tools & Accessories

Before installation, prepare the following:

• Wrench (9/16 in)
• Battery Adapter Cables × 2
• Insulating Gloves
• Multimeter

NOTE: For sizing battery adapter cables, refer to the section "How to Size Battery Adapter Cables?" in this manual.

Get to Know Deep Cycle Lithium Iron Phosphate Battery

Battery Terminals: Features a Negative Terminal (M8) and a Positive Terminal (M8).

Lift Handles: Integrated lift handles for easier transport.

Dimensions

The battery dimensions are:

• Length: 20.55 inches (522 mm)
• Width: 9.45 inches (240 mm)
• Height: 8.62 inches (219 mm)

NOTE: Dimension tolerance is ±0.2 inches (0.5 mm).

How to Size Battery Adapter Cables?

Use appropriately sized Battery Adapter Cables based on expected load. Refer to the table for copper cable ampacities:

NOTE: Values are from NEC Table 310.17 for copper cables at 194°F (90°C) and ambient temperature up to 86°F (30°C). Cables longer than 13 feet (4000 mm) may require thicker wires to prevent voltage drop.

Fix the Battery to a Position (Optional)

Securing the battery prevents damage from loose cables and bumps. Recommended components include a Battery Tray, Tie Down Strap, and Mounting Screws (× 4). Alternative mounting methods are permitted.

Step 1. Plan a Mounting Site

For optimal performance, install the battery in a clean, cool, and dry location, free from water, oil, or dirt, which can cause leakage, self-discharge, or short-circuiting.

Environmental Considerations:

• Ensure adequate ventilation (indicated by vent arrows and air cross-flow diagram).
• KEEP DRY
• FRAGILE
• VENTILATION
• Charge Temperature: -4°F to 131°F (-20°C to 55°C). Self-heating function activates below 32°F (0°C).
• Discharge Temperature: -4°F to 140°F (-20°C to 60°C).
• Operating Humidity: 10%–95%.

NOTE: Sufficient airflow is crucial to prevent heat build-up and minimize temperature variations.

Step 2. Wear Insulating Gloves

Always wear insulating gloves when handling the battery terminals.

Step 3. Remove the Dust Cover.

Carefully remove the protective dust covers from the battery terminals.

Step 4. Check the Battery

Inspect the battery for any visible damage such as cracks, dents, or deformation. Ensure connector contacts are clean, dry, and free of corrosion.

WARNING: Do not touch exposed electrolyte or powder if the battery is damaged. If contact occurs with skin or eyes, flush immediately with clean water and seek medical attention.

Step 5. Run the Adapter Cables Through the Insulating Sleeves

Thread the adapter cables through the provided insulating sleeves before connecting them to the battery terminals.

Step 6. Install Battery Terminals

Connect the battery adapter cables to the terminals using the provided Long Terminal Bolts, Spring Washer, and Flat Washer. Ensure the cable lug and terminal surface are in contact, placing washers on top of the lug. Tighten to 10 N-m (88.5-106.2 inch-lbs).

WARNING: Avoid short-circuiting battery terminals. Verify polarity before wiring to prevent irreversible damage.

CAUTION: Over-tightening can cause terminal breakage; loose connections can lead to overheating. Use Long Terminal Bolts for multiple cable lugs on a single terminal.

Step 7. Install the Insulating Sleeves

Install the insulating sleeves over the connected terminals for protection.

Step 8. Connect the Battery to Other Devices

CAUTION: Use appropriately sized circuit breakers, fuses, or disconnects certified by a qualified electrician to protect equipment.

For a Single Battery

Connect the battery to devices like an Inverter, DC-DC Charger, DC Distribution Panel, and Charge Controller, using a battery fuse for protection.

For Batteries in Parallel

Connect multiple batteries in parallel, ensuring each string is protected by a battery fuse. The system diagram shows connections to Inverter, DC-DC Charger, DC Distribution Panel, and Charge Controller.

For Batteries in Series

Connect batteries in series, with each string protected by a battery fuse. The system diagram shows connections to Inverter, DC-DC Charger, DC Distribution Panel, and Charge Controller.

How to Connect Renogy Core Batteries in Series or Parallel

Calculate Voltage and Current in Series and Parallel Connections

Parallel Connection (e.g., 24V(25.6V) 400Ah): Connect batteries positive-to-positive and negative-to-negative. System voltage remains 25.6V, while system current is the sum of individual battery currents.

Series Connection (e.g., 48V(51.2V) 100Ah): Connect batteries positive-to-negative. System voltage is the sum of individual battery voltages (e.g., 25.6V + 25.6V = 51.2V), while system current remains 100A.

WARNING: Do not connect batteries of different chemistries, capacities, voltages, brands, or models. This can cause damage and safety risks.

CAUTION: Avoid connecting batteries purchased more than six months apart, as performance may degrade. Ensure all connecting cables are of equal length for optimal performance.

NOTE: Up to 8 batteries can be connected in parallel, and up to 2 batteries in series.

Balance Batteries Prior to Connection

Balancing batteries before series or parallel connection is crucial for optimizing performance. Follow these steps:

Step 1: Charge each battery individually to its full capacity using a suitable charger.

Step 2: Use a voltmeter to measure the voltage of each battery.

The ideal voltage difference between batteries should be less than 0.1V.

Step 3: Connect all batteries in parallel and allow them to rest for 12 to 24 hours.

NOTE: Periodically rebalance battery voltages every six months, as slight differences can occur over time due to various factors.

Series Connection vs. Parallel Connection – Installation Steps

Busbars can be used for series and parallel connections to efficiently handle high currents. The following diagrams illustrate connection methods for reference; specific applications may require adjustments.

Parallel Connection

Diagram shows connecting multiple batteries in parallel.

Series Connection

Diagram shows connecting batteries in series.

Parallel & Series Connection

Diagram shows connecting batteries in a combination of parallel and series.

Battery Cell Balancing

The battery uses a bypass circuit to maintain balance between cell groups. During charging, if the highest-voltage cell group reaches the set balancing voltage and exceeds the voltage difference threshold, its switch closes to shunt charge current through a bypass resistor, equalizing voltage until the difference is below the set value. Cell balancing occurs only during charging to prevent energy loss.

Charging/Discharging Parameter Settings

Charge

Discharge

NOTE: Parameters apply to 24V (25.6V) packs. Multiply by 2 for 48V (51.2V) packs.

Battery Charging and Discharging Logic

Batteries may arrive with a partial state of charge (SOC). Fully charge the battery before initial use. If the battery shuts off due to low SOC, disconnect it from loads and charge it to prevent irreversible damage. Follow manual instructions for optimal performance.

Charging Logic

The charging process starts with a constant current of 50A until the battery voltage reaches 29.0V. It then continues at a constant voltage of 29.0V, with the charge current tapering. Charging is complete when the current drops below 5A (tail current).

This process typically takes 2.5 hours and requires battery temperatures between 32°F and 131°F (0°C to 55°C). Float charging helps balance cells without damage.

The charging curve shows a Constant Current phase followed by a Constant Voltage phase, with current tapering from 50A down to 5A as voltage rises to 29.0V.

NOTE: Lithium batteries are compatible with MPPT charge controllers, AC chargers, and DC-DC chargers. Set charge/boost/bulk voltage to 29.0V (±0.2V).

WARNING: Do not overcharge or overdischarge. Do not discharge above 140°F (60°C). Only use chargers compatible with lithium iron phosphate batteries. Do not exceed the maximum continuous charge current of 100A.

Discharging Logic

During standard discharging, the battery delivers a constant current of 100A until the voltage drops to 20V. Safe discharging requires battery temperatures between -4°F (-20°C) and 131°F (60°C).

NOTE: Pair with discharge equipment featuring a low voltage disconnect (LVD) function for optimal usage.

WARNING: Do not connect large loads when the battery is low. Do not exceed the maximum continuous discharge current of 100A.

How to Estimate the Battery SOC?

The State of Charge (SOC) can be estimated based on resting voltage after 30 minutes of inactivity:

NOTE: These values are for reference; slight variations may occur.

Self-heating Function

The self-heating function requires a stable charge current greater than 10A per battery in a parallel bank. It activates when the battery temperature drops below 41°F (5°C) and stops when it rises above 50°F (10°C). The temperature can rise by approximately 86°F (30°C) per hour at 200W.

Battery Management System

The integrated BMS provides protection against overvoltage, undervoltage, overcurrent, short circuit, high temperature, and low temperature conditions. Refer to the table for trigger and recovery conditions:

Troubleshooting

For further assistance, contact Renogy technical support at renogy.com/contact-us.

Specifications

General

Operation Parameters

Maintenance & Storage

Inspection

Perform regular inspections:

• Examine battery appearance: housing and terminals should be clean, dry, and free of corrosion.
• Check battery cables and connections: replace damaged cables and tighten loose connections.

NOTE: Terminal corrosion can increase resistance. Apply insulation grease for a moisture-resistant seal.

Cleaning

Clean the battery at regular intervals:

• Disconnect the battery from the system.
• Clear leaves and debris from the battery.
• Clean with a soft, lint-free cloth, dampened with water or mild soap if necessary.
• Dry with a soft, lint-free cloth.
• Keep the surrounding area clean.
• Reconnect the battery to the system.

Checking Voltage

Periodically check battery voltage for health. If the battery cannot be activated with >1A current or shows a resting voltage below 10V, it may be severely overdischarged. Stop use until the fault is corrected and the battery can be charged.

Storage

Ensure good condition during storage:

• Charge the battery to 30% to 50% SOC.
• Disconnect the battery from the system.
• Store in a well-ventilated, dry, clean area between -13°F (-25°C) and 149°F (65°C).
• Avoid direct sunlight, moisture, or precipitation.
• Handle carefully to avoid impacts or pressure.
• Charge every 3 to 6 months to prevent overdischarge.
• Fully charge when taking out of storage.

Important Safety Instructions

The manufacturer is not liable for damage caused by:

• Force majeure (fire, flood, earthquake, war, terrorism).
• Misuse, abuse, neglect, improper maintenance, or use under abnormal conditions.
• Improper installation, operation, or peripheral device malfunction.
• Contamination with hazardous substances or radiation.
• Alterations without written consent.

General Safety

• Wear protective equipment and use insulated tools during installation and operation.
• Do not wear jewelry or metal objects near the battery.
• Keep the battery out of reach of children.
• Dispose of batteries according to local, state, and federal regulations; use recycling channels.
• In case of fire, use FM-200 or CO2 extinguisher.
• Do not expose the battery to flammable or harsh chemicals or vapors.
• Clean the battery regularly.
• Cables should not exceed 10 meters to avoid voltage drop. Cable specifications account for <3% voltage drop and may not cover all configurations.
• Do not expose the battery to strong electrostatic, magnetic fields, or radiation.

Battery Safety

• 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 terminals or connectors.
• Ensure battery charger or charge controller is disconnected before working on the battery.
• Do not connect or disconnect terminals without first disconnecting loads.
• Do not place tools on top of the battery.
• Use suitable handling equipment for safe transportation.
• Do not insert foreign objects into the positive and negative terminals.

Renogy Support

For inaccuracies or omissions, visit renogy.com/support/downloads or contact contentservice@renogy.com.

For technical questions in the U.S., contact Renogy technical support via renogy.com/contact-us or call 1(909)2877111.

For technical support outside the U.S., visit regional websites:

• Canada: ca.renogy.com
• Australia: au.renogy.com
• South Korea: kr.renogy.com
• United Kingdom: uk.renogy.com
• China: www.renogy.cn
• Japan: renogy.jp
• Germany: de.renogy.com
• Other Europe: eu.renogy.com

FCC Statement

This device complies with Part 15 of the FCC Rules, subject to two conditions: (1) it may not cause harmful interference, and (2) it must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the responsible party could void the user's authority to operate the equipment.

This equipment has been tested and found to comply with Class B digital device limits per FCC Rules, designed to provide reasonable protection against harmful interference in residential installations. It generates, uses, and can radiate radio frequency energy. If not installed and used per instructions, it may cause harmful interference to radio communications. There is no guarantee interference will not occur. If interference occurs, users are encouraged to try correcting it by:

• Reorienting or relocating the receiving antenna.
• Increasing separation between equipment and receiver.
• Connecting the equipment to a different circuit.
• Consulting a dealer or experienced radio/TV technician.

FCC Radiation Exposure Statement

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

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Renogy reserves the right to change manual contents without notice.

Manufacturer: RENOGY New Energy Co.,Ltd

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