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

Before Getting Started

The 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 (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 applicability of information in the user manual at the time of printing due to continual product improvements.
• Renogy assumes no responsibility or liability for personal and property losses, whether directly or 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.
• 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 25.6V 100Ah Deep Cycle Lithium Iron Phosphate Battery User Manual © 2023 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.
• Registered trademarks in the user manual are the property of Renogy. Unauthorized use of trademarks is strictly prohibited.

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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 25.6V 100Ah Deep Cycle Lithium Iron Phosphate Battery is designed for the drop-in replacement of deep-cycle lead-acid batteries with its standard Battery Council International (BCI) group size.

Weighing only half of 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 5000+ cycle life. The reliable Battery Management System (BMS) provides comprehensive protection to the battery.

Key Features

• Unparalleled Performance: Features greater energy density, deeper discharge capability, higher round-trip efficiency, and faster charging speed in a smaller size compared to market counterparts.
• Uncompromising Quality: Ensures an exceptional lifespan with over 5000 cycles (80% DOD), a continuous charge current of 100A, a continuous discharge current of 100A, and a wide range of operating temperatures with automotive-grade battery cells.
• Reliable Protection Mechanisms: Designed with a sturdy internal structure for RV use, including multiple levels of protection such as low temperature cut-off and precise balancing through the smart battery management system.
• Intelligent High Power Self-heating Function: Equipped with a 200W self-heating function to ensure charging at low temperatures.
• Easy to Expand: Upgrades to lithium batteries seamlessly with standard BCI group sizes; supports up to 16 batteries in 2 series and 8 parallel system connections, delivering a maximum of 48V (51.2V) 800Ah with 40.96 kWh.

SKU

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

RBT24100LFPSH

What's In the Box?

The package contains:

• Renogy Core LT (Low Temperature) Series 25.6V 100Ah Deep Cycle Lithium Iron Phosphate Battery x 1
• User Manual x 1
• Insulating Sleeve x 2
• Long Terminal Bolt (M8*1.25*20 mm) x 2

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

Required Tools & Accessories

• Wrench (9/16 in or 14 mm)
• Battery Adapter Cables x 2
• Insulating Gloves
• Multimeter

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

The battery features:

• Negative Terminal (M8)
• Positive Terminal (M8)
• Lift Handles

Description of Battery Image: A rectangular deep cycle lithium iron phosphate battery with 'RENOGY', 'DEEP CYCLE', 'LITHIUM IRON PHOSPHATE', and 'CORE' branding. It shows the positive and negative terminals on top, along with lift handles on the sides. Labels indicate '25.6V 100AH'.

Dimensions

Length: 20.55 in (522 mm)

Width: 9.45 in (240 mm)

Height: 8.62 in (219 mm)

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.

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 from loose cables and bumps.

Recommended Components: Battery Tray, Tie Down Strap, Mounting Screws × 4.

Description of Mounting Diagram: Illustrates securing the battery using a tie-down strap over the battery and attached to a battery tray, with mounting screws.

Alternative mounting methods are allowed to meet specific application requirements.

Step 1. Plan a Mounting Site

For optimal battery performance, install the battery in a clean, cool, and dry location, free from accumulation of water, oil, or dirt. Such materials can lead to current leakage, self-discharge, and short-circuiting.

Environmental Considerations:

• Ventilation is required.
• Keep the area dry.
• Avoid fragile conditions.

Operating Temperature Ranges:

• Charge: -4°F to 131°F (-20°C to 55°C) (Self-heating function is active below 32°F/0°C)
• Discharge: -4°F to 140°F (-20°C to 60°C)
• Humidity: 10% to 95%

Sufficient airflow must be provided to prevent excessive heat build-up and minimize temperature variation between connected batteries.

Description of Mounting Site Diagram: Shows a battery in an enclosed space with arrows indicating air cross-flow for ventilation. Environmental icons for 'KEEP DRY', 'FRAGILE', and 'VENTILATION' are displayed.

Step 2. Wear Insulating Gloves

Description of Image: A hand wearing an orange insulating glove, positioned near a battery.

Always wear insulating gloves when handling battery terminals.

Step 3. Remove the Dust Cover.

Description of Diagram: Shows the battery terminal with a red dust cover being removed.

Step 4. Check the Battery

Inspect the battery for any visible damage, including cracks, dents, deformation, and other abnormalities. Ensure all connector contacts are clean, dry, and free of corrosion.

⚠️ 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 Adapter Cables Through the Insulating Sleeves

Description of Diagram: Shows red and grey adapter cable ends being inserted into red and grey insulating sleeves before connecting to the battery terminals.

Step 6. Install Battery Terminals

Description of Diagram: Illustrates connecting the battery adapter cable to the battery terminal using a long terminal bolt, spring washer, and flat washer. A torque wrench indicates a tightening torque of 10 N·m.

⚠️ 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 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.

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

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

Step 7. Install the Insulating Sleeves

Description of Diagram: Shows the battery terminals after connection, with red and grey insulating sleeves being slid over the terminals for protection.

Step 8. Connect the Battery to Other Devices

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

For a Single Battery

Description of Diagram: A single battery connected via a battery fuse to an Inverter, DC-DC Charger, DC Distribution Panel, and Charge Controller.

For Batteries in Parallel

Description of Diagram: Two batteries connected in parallel, with a battery fuse leading to an Inverter, DC-DC Charger, DC Distribution Panel, and Charge Controller.

For Batteries in Series

Description of Diagram: Two batteries connected in series, with a battery fuse leading to an 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 (Example: 4 batteries)

System Voltage: 25.6V

System Current: Sum of the individual battery currents

Description of Diagram: Four batteries shown connected in parallel: positive terminals connected together, and negative terminals connected together.

Series Connection (Example: 2 batteries)

System Voltage: 48V (51.2V)

System Current: 100A

Description of Diagram: Two batteries shown connected in series: the positive terminal of the first battery is connected to the negative terminal of the second battery.

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

⚠️ Avoid connecting batteries purchased more than half a year apart. Over time, batteries degrade, affecting performance and potentially leading to safety hazards.

ℹ️ Cables between connected batteries should be of equal length for optimal performance.

You can connect up to 8 batteries in parallel or 2 batteries in series.

Balance Batteries Prior to Connection

Before connecting batteries in series or parallel, balance them to reduce voltage differences and optimize performance. Follow these steps:

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

Description of Diagram: A single battery connected to a Battery Fuse and a Charge Controller, with a DC-DC Charger shown nearby.

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 0.1V.

Description of Diagram: A multimeter connected to a battery terminal, displaying a voltage reading (e.g., 27.1V).

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

Description of Diagram: Batteries shown connected in parallel, with a clock icon indicating 12-24 hours.

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

Series Connection vs. Parallel Connection – Installation Steps

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

ℹ️ Cable connection methods provided are for reference only; the optimal approach may vary. Consider factors like cable size, equipment used, and environmental conditions.

Parallel Connection

Description of Diagram: Illustrates connecting multiple batteries in parallel using busbars, connecting positive to positive and negative to negative.

Series Connection

Description of Diagram: Illustrates connecting batteries in series using busbars, connecting positive of one to negative of the next.

Parallel & Series Connection (2P2S)

Description of Diagram: Illustrates a configuration of batteries connected in parallel and series (2 parallel strings of 2 batteries each) using busbars.

Battery System Configurations and Capacities:

• 2P: Battery System 24V (25.6V) 200Ah, Energy 5120Wh
• 8P: Battery System 24V (25.6V) 800Ah, Energy 20480Wh
• 2S: Battery System 48V (51.2V) 100Ah, Energy 5120Wh
• 2P2S: Battery System 48V (51.2V) 200Ah, Energy 10240Wh
• 4P2S: Battery System 48V (51.2V) 400Ah, Energy 20480Wh

Description of Battery Cell Balancing Diagram: A complex diagram showing battery cell groups connected in parallel with bypass resistors and switches, illustrating the cell balancing mechanism.

The battery employs a bypass circuit to maintain balance between each battery cell group. During charging, if the highest-voltage cell group reaches the balancing start voltage and the voltage difference exceeds the set value, a switch closes to shunt charge current through a bypass resistor until the difference drops. This process occurs only during charging to avoid energy loss.

Charging/Discharging Parameter Settings

Charge

Discharge

ℹ️ Parameters are applicable to 24V (25.6V) battery packs. Multiply by 2 for 48V (51.2V) packs.

Battery Charging and Discharging Logic

The battery may be received at a partial state of charge (SOC). It is crucial to 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 proper charging and usage to ensure optimal performance and longevity.

Charging Logic

The standard charging process involves charging at a constant current of 50A until the battery voltage reaches 29.0V, followed by charging at a constant voltage of 29.0V with tapering current. 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 and 55°C). Leaving the battery on float will continue to balance cells without damage.

Description of Charging Logic Graph: A graph showing 'Current' decreasing from 50A (Constant Current phase) to below 5A, while 'Voltage' rises to 29.0V and remains constant (Constant Voltage phase). The Y-axis is labeled 'I/A' (Current) and 'U/V' (Voltage), with a peak voltage of 29.0V and peak current of 50A.

ℹ️ Lithium batteries are compatible with MPPT charge controllers, AC chargers, and DC-DC chargers. Set charge/boost/bulk voltage at 29.0V (±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 charger compatible with lithium iron phosphate batteries.

⚠️ Do not exceed the maximum continuous charge current (100A).

Discharging Logic

During standard discharging, the battery delivers a constant current of 100A until the voltage drops to 20V. For safe discharging, the battery temperature should be between -4°F (-20°C) and 131°F (60°C).

ℹ️ To ensure safe and optimal usage, pair the battery with discharge equipment featuring a low voltage disconnect (LVD) function.

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

⚠️ Do not exceed the maximum continuous discharge current (100A).

How to Estimate the Battery SOC?

SOC values are estimated based on resting voltage after 30 minutes of inactivity (not charging or discharging).

ℹ️ This table is for reference only; slight variations in battery voltage 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 battery temperature drops below 41°F (5°C) and stops automatically above 50°F (10°C). The temperature can rise approximately 86°F (30°C) per hour at 200W power.

Battery Management System

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

Troubleshooting

ℹ️ 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 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 to form a moisture-resistant seal and protect from corrosion.

Cleaning

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

• Disconnect the battery from the system.
• Clear leaves and debris from the battery.
• Clean the battery with a soft, lint-free cloth, dampened with water or mild soap and water if 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

Periodically check the battery voltage to assess health. If the battery cannot be activated with a charge/discharge current greater than 1A, or if activated with a resting voltage below 10V, it may be severely overdischarged. Stop using the battery until the fault is corrected and it can be charged.

Storage

Follow these tips to ensure the battery emerges from storage in good condition:

• Charge the battery to 30% to 50% SOC.
• Disconnect the battery from the system.
• Store in a well-ventilated, dry, clean area with temperatures between -13°F (-25°C) and 149°F (65°C).
• Do not expose to direct sunlight, moisture, or precipitation.
• Handle carefully to avoid sharp impacts or extreme pressure on the battery housing.
• Charge at least once every 3 to 6 months to prevent overdischarge.
• Fully charge the battery when taking it 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, improper maintenance, or 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, use 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 to avoid excessive voltage drop.
• Cable specifications in the quick guide account for a critical, less than 3% voltage drop and may not cover all configurations.
• Do not expose the battery to strong electrostatic fields, strong 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 any terminals or connectors.
• Ensure 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.
• Use suitable handling equipment for safe transportation.
• Do not insert foreign objects into the positive and negative terminals.

Renogy Support

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

• Website: renogy.com/support/downloads
• Email: contentservice@renogy.com

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

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

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

• 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. 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.

Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

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. Reorient 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 a minimum distance of 20cm between the radiator and your body.

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Manufacturer Information

Manufacturer: RENOGY New Energy Co.,Ltd

Address: No.66, East Ningbo Road Room 624-625 Taicang German Overseas Students Pioneer Park JiangSu 215000 CN

UK REP: EVATOST CONSULTING LTD, Suite 11, First Floor, Moy Road Business Centre, Taffs Well, Cardiff, Wales, CF15 7QR, contact@evatmaster.com

Website: RENOGY.COM