Renogy Core LT (Low Temperature) Series 48V 50Ah Deep Cycle Lithium Iron Phosphate Battery User Manual
Model: RBT4850LFPSH
Version: A0
Date: September 23, 2024
Before Getting Started
This user manual provides important operation and maintenance instructions for the Renogy Core LT (Low Temperature) Series 48V 50Ah Deep Cycle Lithium Iron Phosphate Battery (referred to as 'battery'). Read the manual carefully before operation and save it for future reference. Failure to observe instructions may result in electrical shock, serious injury, or death, or damage to the battery.
Key Points:
- Renogy ensures accuracy at the time of printing, but product improvements may occur.
- Renogy is not responsible for losses due to non-compliance with the manual.
- Renogy is not liable for damage from unauthorized repairs, improper installation, or operation.
- Illustrations are for demonstration; details may vary.
- Renogy reserves the right to change information without notice. Visit renogy.com for the latest manual.
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 is subject to copyright and intellectual property rights of Renogy and its licensors. Reproduction or copying in whole or part requires prior written permission. Unauthorized use of trademarks is strictly prohibited.
Symbols Used
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 48V 50Ah Deep Cycle Lithium Iron Phosphate Battery is designed as a direct replacement for deep-cycle lead-acid batteries, offering a smaller size and lighter weight (half that of lead-acid counterparts). It can be safely discharged to 100% Depth of Discharge (DOD), delivering twice the energy. Manufactured with automotive-grade battery cells, it features high safety standards and an extended 6000+ cycle life. The Smart 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 compact size.
- Uncompromising Quality: Exceptional lifespan (6000+ cycles at 80% DOD), continuous charge/discharge current of 50A, 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 BMS balancing.
- Intelligent Self-heating Function & More Stable Performance: Built-in heater operates automatically at low temperatures to enable charging, ensuring performance and increasing battery lifespan.
- Easy to Expand: Supports up to 8 batteries in parallel, delivering a maximum of 48V 400Ah at 19.2kWh.
SKU
| Renogy Core LT (Low Temperature) Series 48V 50Ah Deep Cycle Lithium Iron Phosphate Battery | RBT4850LFPSH |
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
Note: Ensure all accessories are complete and free of any signs of damage.
Required Tools & Accessories
- Wrench (17/32 in or 13 mm)
- Battery Adapter Cables x 2
- Insulating Gloves
- Multimeter
Note: Prior to installation, prepare recommended tools, components, and accessories. Refer to "How to Size Battery Adapter Cables?" for cable sizing guidance.
Get to Know Deep Cycle Lithium Iron Phosphate Battery
Battery Terminals: Features M8 negative and positive terminals. Includes lift handles for easier transport.
Dimensions:
- Length: 15.1 in (384 mm)
- Height: 9.8 in (248 mm)
- Width: 7.6 in (195 mm)
Dimension tolerance: ±0.2 in (0.5 mm)
How to Size Battery Adapter Cables?
Use appropriately sized Battery Adapter Cables based on expected load. The table below shows copper cable ampacities for cables up to 13 feet (4 m). Longer cables may require thicker gauges to prevent voltage drop.
| Cable Gauge Size | Ampacity | Cable Gauge Size | Ampacity |
|---|---|---|---|
| 14 AWG (2.08 mm²) | 35A | 2 AWG (33.6 mm²) | 190A |
| 12 AWG (3.31 mm²) | 40A | 1 AWG (42.4 mm²) | 220A |
| 10 AWG (5.25 mm²) | 55A | 1/0 AWG (53.5 mm²) | 260A |
| 8 AWG (8.36 mm²) | 80A | 2/0 AWG (67.4 mm²) | 300A |
| 6 AWG (13.3 mm²) | 105A | 4/0 AWG (107 mm²) | 405A |
| 4 AWG (21.1 mm²) | 140A |
Note: Values are from NEC Table 310.17 for copper cables rated at 194°F (90°C), operating at ambient temperatures up to 86°F (30°C).
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 (x4). Alternative mounting methods may be used depending on specific applications.
Installation Steps
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. Accumulation of such materials can lead to current leakage, self-discharge, and short-circuiting.
Ensure sufficient airflow to prevent heat build-up and minimize temperature variation between connected batteries.
Operating Conditions:
- Charge Temperature: -4°F to 131°F (-20°C to 55°C)
- Discharge Temperature: -4°F to 140°F (-20°C to 60°C)
- Humidity: 10% to 95%
Icons: [Keep Dry] [Fragile] [Ventilation]
Step 2. Wear Insulating Gloves
Always wear insulating gloves when handling 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 visible damage like 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 Battery Adapter Cables Through the Insulating Sleeves
Thread the battery adapter cables through the provided insulating sleeves before connecting them to the terminals.
Step 6. Install Battery Terminals
Connect the battery adapter cables to the terminals using the provided Long Terminal Bolts, Flat Washer, and Spring Washer. Ensure the cable lug and terminal surface are in contact. Tighten to 10 N·m (88.5-106.2 inch-lbs).
WARNING: Do not place washers between the terminal and cable lug to avoid high resistance and heating. Avoid short-circuiting terminals. Verify polarity before wiring to prevent damage.
Note: Over-tightening can cause terminal breakage; loose connections can lead to meltdown or fire. Use Long Terminal Bolts for multiple cable lugs on a single terminal.
Step 7. Install the Insulating Sleeves
After connecting the cables, slide the insulating sleeves over the terminals to protect them.
Step 8. Connect the Battery to Other Devices
Use appropriately sized circuit breakers, fuses, or disconnects installed by a certified electrician.
For a Single Battery: Connect the battery via a battery fuse to the inverter, DC-DC converter, DC distribution panel, and charge controller.
For Batteries in Parallel: Connect multiple batteries in parallel, with a battery fuse, to the inverter, DC-DC converter, DC distribution panel, and charge controller.
How to Connect Renogy Core Batteries in Parallel
Calculate Voltage and Current in Parallel Connections
Connect batteries in parallel by linking positive terminals to positive terminals and negative terminals to negative terminals. Ensure all connecting cables are of equal length for balanced operation. Up to 8 batteries can be connected in parallel.
- System Voltage: 48V
- System Current: Sum of individual battery currents
Example: Four 48V 50Ah batteries in parallel result in a 48V 200Ah system.
WARNING: Do not connect batteries with different chemistries, capacities, voltages, brands, or models in parallel or series, as this can cause damage and safety risks.
WARNING: Avoid connecting batteries older than six months, as performance may degrade over time.
Balance Batteries Prior to Connection
To optimize performance, balance batteries by following these steps:
- Charge: Charge each battery individually to full capacity using a suitable charger.
- Measure Voltage: Use a voltmeter to check each battery's voltage. The difference between batteries should be less than 0.2V.
- Rest: Connect all batteries in parallel and allow them to rest for 12 to 24 hours.
Note: Periodically rebalance battery voltages every six months. Slight voltage differences may occur over time due to chemistry, capacity, temperature, and usage.
Parallel Connection – Installation Steps
Use suitable busbars for parallel connections to handle high currents efficiently. The connection methods shown are for reference; optimal approaches may vary based on specific conditions like cable size and environment.
System Capacity Examples:
- 2P (Parallel): Battery System 48V 100Ah, Energy 4800Wh
- 8P (Max): Battery System 48V 400Ah, Energy 19200Wh
Battery Cell Balancing
The battery uses a bypass circuit with resistors and switches to maintain balance between cell groups. During charging, if a cell group's voltage exceeds the set balancing start voltage and the difference between the highest and lowest voltage groups is too large, the switch for the highest voltage group closes, shunting charge current through a resistor until the voltage difference is reduced. Cell balancing occurs only during charging to prevent energy loss.
Charging/Discharging Parameter Settings
| Charge | |||
|---|---|---|---|
| Charge/Boost Voltage | 54.0V | Boost Return Voltage | 49.5V |
| Bulk/Absorption Voltage | 54.0V | Overvoltage Disconnect | 56.3V |
| Bulk/Absorption Voltage | 54.0V / Disabled | Overvoltage Reconnect | 53.3V |
| Discharge | |||
| Low Voltage Reconnect | 47.3V | Undervoltage Warning | 45.0V |
| Undervoltage Shutdown | 42.0V | ||
Note: Parameters apply to 48V (15 cells) battery packs.
Battery Charging and Discharging Logic
The battery may arrive at a partial state of charge (SOC). Fully charge it before initial use. If the battery shuts off due to low SOC, disconnect it from loads and charge it promptly to prevent irreversible damage.
Charging Logic
The standard charging process involves charging at a constant current of 50A until the voltage reaches 54V, then charging at a constant voltage of 54V while tapering the current. Charging is complete when the current drops below 2.5A (tail current). This process typically takes 1.5 hours and requires battery temperatures between 32°F (0°C) and 131°F (55°C). Float charging helps balance cells without damage.
Charging Graph: Shows current tapering from 50A (Constant Current) to below 2.5A as voltage rises to 54V (Constant Voltage).
Note: Lithium batteries are compatible with MPPT, AC, and DC-DC chargers. Set charge/boost/bulk voltage to 54V (±0.2V).
WARNING: Do not overcharge or overdischarge. Do not discharge above 140°F (60°C). Use only chargers compatible with lithium iron phosphate batteries. Do not exceed the maximum continuous charge current of 50A.
Discharging Logic
During standard discharging, the battery delivers a constant current of 50A until the voltage drops to 42V. For safe discharging, maintain battery temperature between -4°F (-20°C) and 131°F (60°C).
Note: Pair the battery with discharge equipment featuring a low voltage disconnect (LVD) function. Do not connect large loads when the battery is running low.
WARNING: Do not exceed the maximum continuous discharge current (50A).
How to Estimate the Battery SOC?
State of Charge (SOC) is estimated based on resting voltage (open-circuit voltage) after 30 minutes of inactivity.
| SOC | Open Circuit Voltage | SOC | Open Circuit Voltage |
|---|---|---|---|
| 100% | 51.0V | 30% | 48.4V |
| 99% | 50.3V | 20% | 48.0V |
| 90% | 49.5V | 14% | 47.6V |
| 70% | 49.1V | 9% | 47.2V |
| 40% | 48.8V | 0% | 42.0V |
Note: Values are for reference; slight variations may occur between batteries.
Self-heating Function
The self-heating function requires a stable charge current greater than 3.5A per battery in a parallel bank. It activates when battery temperature drops below 32°F (0°C) and stops automatically when it rises above 41°F (5°C), using up to 200W of power.
Battery Management System (BMS)
The BMS provides warnings and protections against overvoltage, undervoltage, overcurrent, short circuit, high temperature, and low temperature conditions. Refer to the table for trigger and recovery conditions:
| Battery Operating Status | Condition (For Reference Only) | |
|---|---|---|
| Battery Cell Overvoltage Protection | Trigger | Battery Cell Voltage ≥ 3.65V |
| Recover | Battery Cell Voltage ≤ 3.40V | |
| Battery Cell Undervoltage Protection | Trigger | Battery Cell Voltage ≤ 2.50V |
| Recover | Battery Voltage ≥ 3.25V | |
| Charge High Temperature Protection | Trigger | Battery Temperature ≥ 131°F (55°C) |
| Recover | Battery Temperature ≤ 122°F (50°C) | |
| Discharge High Temperature Protection | Trigger | Battery Temperature ≥ 140°F (60°C) |
| Recover | Battery Temperature ≤ 131°F (55°C) | |
| Charge Low Temperature Protection | Trigger | Battery Temperature ≤ 32°F (0°C) |
| Recover | Battery Temperature ≥ 41°F (5°C) | |
| Charge Overcurrent Protection | Trigger | Charge Current ≥ 55A |
| Recover | Discharge Current ≥ 1A or Recover automatically after 60s | |
| Discharge Overcurrent | Primary Protection Trigger | Discharge Current ≥ 60A |
| Primary Protection Recover | Charge Overcurrent ≥ 1A or Recover automatically after 60s | |
| Secondary Protection Trigger | Discharge Current ≥ 100A | |
| Secondary Protection Recover | Charge Overcurrent ≥ 1A or Recover automatically after 60s | |
| Short Circuit Protection | Trigger | Discharge Current ≥ 600A |
| Recover | Remove Short Circuit |
Troubleshooting
| Problem | Possible Causes | Solution |
|---|---|---|
| Battery unable to activate with charge/discharge current > 1A | Severe battery overdischarge due to self-discharge or parasitic loads | Revive battery with a charger featuring lithium battery activation or force charging. |
| Battery activates at resting voltage below 42V | Battery voltage drops below preset threshold | Disconnect from loads, charge with current > 1A ASAP. |
| Battery shuts off due to undervoltage protection | Battery voltage drops below preset threshold | Disconnect from loads, charge with current > 1A ASAP. |
| Battery cuts off charging current due to overvoltage protection | Battery voltage exceeds preset threshold during charging | 1. Disconnect from charging source. 2. Reduce charge voltage by 0.2V-0.4V for 6 hours. 3. Attempt full charge again. Repeat if necessary. |
| Battery temperature too high/low triggers protection | Battery temperature exceeds preset threshold | 1. Disconnect from source/loads. 2. Cool down/Warm up battery. 3. Battery recovers automatically. |
| Battery shorted, triggers short circuit protection | Short circuit occurs in the battery | 1. Remove short circuit ASAP. 2. Charge battery with current > 1A. |
| Charge/Discharge over-current protection triggered | Excessive current during charging or discharging | Disconnect battery from charging source or loads ASAP. |
For further assistance: Contact Renogy technical support at renogy.com/contact-us.
Specifications
General
| Specification | Value |
|---|---|
| Battery Cell Type | Lithium Iron Phosphate |
| Rated Capacity (0.5C, 25°C) | 50Ah |
| Nominal Voltage | 48V |
| Voltage Range | 42.0V to 55.5V |
| Cycle Life (0.5C, 25°C) | 6000 Cycles (80% DOD) |
| Dimension | 15.1 x 7.6 x 9.8 in / 384 x 195 x 248 mm |
| Weight | 51.4 lbs / 23.3 kg |
| Connection Method | Parallel (8P) |
| Terminal Bolt Size | M8 x 1.25 x 15 mm |
| Recommended Terminal Torque | 88.5 inch-lbs to 106.2 inch-lbs / 10 N·m to 12 N·m |
| Protection Rating | IP65 |
| Certification | MSDS, UN38.3, FCC, CE, PSE, and UKCA |
Operation Parameters
| Parameter | Value |
|---|---|
| Charge Voltage | 54V |
| Maximum Continuous Charge Current | 50A |
| Maximum Continuous Discharge Current | 50A |
| Peak Discharge Current | 100A@5s |
| Charge Temperature Range | -4°F to 131°F / -20°C to 55°C |
| Discharge Temperature Range | -4°F to 140°F / -20°C to 60°C |
| Storage Temperature Range | -13°F to 149°F / -25°C to 65°C |
| Operation Relative Humidity | 10% to 95% |
Maintenance & Storage
Inspection
- Examine battery appearance, housing, and terminals for cleanliness, dryness, and absence of corrosion.
- Check battery cables and connections; replace damaged cables and tighten loose connections.
Note: Apply insulation grease to terminals to prevent corrosion and ensure good contact.
Cleaning
- Disconnect the battery from the system.
- Clear debris from the battery.
- Clean with a soft, lint-free cloth, dampened with water or mild soap and water if very dirty.
- Dry with a soft, lint-free cloth.
- Keep the surrounding area clean.
- Reconnect the battery to the system.
Checking Voltage
Periodically check battery voltage. If the battery cannot be activated with a current > 1A or has a resting voltage below 37.5V, it may be severely overdischarged. Stop using it until the fault is corrected and it can be charged.
Storage
- Charge the battery to 30%-50% SOC before storage.
- 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 on the housing.
- Recharge the battery every 3-6 months to prevent overdischarge.
- Fully charge the battery when taking it out of storage.
Important Safety Instructions
General
- 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 the battery according to local, state, and federal laws; 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.
- Cable length should not exceed 10 meters to avoid voltage drop.
- Do not expose to strong electrostatic fields, 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, or modify the battery.
- Do not touch terminals or connectors.
- Ensure battery charger/controller is disconnected before working on the battery.
- Do not connect/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 terminals.
Renogy Support
For inaccuracies or omissions, visit or contact Renogy:
- Website: renogy.com/support/downloads
- Email: contentservice@renogy.com
Explore solar systems at the Renogy Learning Center: renogy.com/learning-center
For technical questions in the U.S., contact support:
- Website: renogy.com/contact-us
- Phone: 1(909)2877111
For technical support outside the U.S., visit local websites:
- Canada: ca.renogy.com
- China: www.renogy.cn
- Australia: au.renogy.com
- Japan: jp.renogy.com
- Other Europe: eu.renogy.com
- Germany: de.renogy.com
- United Kingdom: uk.renogy.com
Battery Recycling
Proper disposal and recycling are essential for environmental protection. Dispose of depleted batteries at locations accepting Renogy rechargeable batteries (e.g., Call2Recycle, Earth911).
- Find locations: www.call2recycle.org/locator
- Find locations: search.earth911.com
Participate in Renogy's incentive program to earn $20 gift cards for proper battery disposal.
Support: renogy.com/support
FCC Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to two conditions: (1) no harmful interference, and (2) acceptance of any received interference.
This equipment complies with Class B digital device limits, providing reasonable protection against harmful interference in residential installations. It generates and radiates radio frequency energy. If not installed per instructions, it may cause radio communication interference. No guarantee against interference in specific installations.
If interference occurs, try correcting it by:
- Orienting or relocating the receiving antenna.
- Increasing separation between equipment and receiver.
- Connecting to a different circuit than the receiver.
- Consulting a dealer or technician.
FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits for an uncontrolled environment. Install and operate with a minimum distance of 20cm between the radiator and your body.
Renogy Empowered
Renogy empowers people globally through education and distribution of DIY-friendly renewable energy solutions, driving sustainable living and energy independence. Their solar products help minimize carbon footprints by reducing reliance on grid power.
Live Sustainably with Renogy
A 1 kW solar energy system can save:
- 170 pounds of coal from being burned
- 300 pounds of CO2 from being released into the atmosphere
- 105 gallons of water from being consumed
Renogy Power PLUS
Renogy Power Plus keeps you updated on solar innovations, allows sharing of solar energy journeys, and connects you with a community making a difference.
Connect with Renogy:
- YouTube: @Renogy Solar
- Instagram: @renogyofficial
- Facebook: @Renogy
Renogy reserves the right to change manual contents without notice.
Renogy AU Official | Trusted Off-Grid Solutions
Renogy CA Official | Trusted Energy Solutions
Renogy DE Official | Vertrauenswürdige Energielösungen
Renogy EU Official | Trusted Off-Grid Solutions
Renogy JP 公式サイト 丨 信頼のエネルギーソリューション
Renogy US Official | Trusted Off-Grid Solutions
Recycling Center Search - Earth911.com
Renogy UK Official | Trusted Off-Grid Solutions
RENOGY如果新能源 | 让每个人拥有独立清洁的能源
Renogy US Official | Trusted Off-Grid Solutions
