RENOGY Core Series

Deep Cycle Lithium Iron Phosphate Battery

Model: RBT1250LFP

Version: A0

Specifications: 12.8V | 50Ah

Before Getting Started

This user manual provides operation and maintenance instructions for the Renogy Core Series 12.8V 50Ah Deep Cycle Lithium Iron Phosphate Battery.

Read carefully before operation and save for future reference. Failure to follow instructions can result in electrical shock, serious injury, death, or battery damage.

Renogy ensures accuracy at printing, but product improvements may occur.
Renogy is not liable for losses due to failure to install/use per the manual.
Renogy is not liable for issues from unqualified repairs, improper installation, or operation.
Illustrations are for demonstration; details may vary by revision/region.
Renogy reserves the right to change manual information without notice. Visit renogy.com for the latest version.

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Safety Precautions

⚠️ Danger High Voltage

DO NOT touch any terminals or connectors to avoid electric shock.

? Eye Protection Must Be Worn

ALWAYS wear protective clothing and eyeglasses while working with the Lithium Iron Phosphate Battery.

? Emergency Eye Wash

Any uncovered battery material (electrolyte/powder) on skin or in eyes must be flushed with clean water immediately. Seek medical attention. Spills on clothing should be rinsed with water.

? Caution Risk Of Fire Highly Flammable Material

Terminals of the Lithium Iron Phosphate Battery are always live. DO NOT place tools on them. DO NOT short circuit or use outside of specified electrical ratings.

General Safety Precautions

Use appropriately sized circuit breakers, fuses, or disconnects certified by electricians or authorities to protect system equipment. The Battery Management System (BMS) protects cells from over-charge, over-discharge, and over-current, but does not protect the entire system from severe electrical conditions.
Verify polarity before connecting wiring. Reverse polarity WILL destroy the battery.
DO NOT short-circuit battery terminals. This can cause amperage bursts, irreversible damage, and potential explosion.
Wear proper personal protective equipment (PPE) when working on the battery.
ONLY connect identical batteries in parallel or series for optimal performance.
If the battery shuts off due to low charge, disconnect it from equipment to eliminate parasitic loads and charge it immediately.
It is highly recommended to pair the battery with low voltage disconnect devices in the system setup.

Battery Installation

Safe and reliable installation requires trained and certified technicians. This section is a guideline only.

Steps:

Mounting Site: Install in a clean, cool, dry location, free from water, oil, or dirt to prevent current leakage, self-discharge, or short-circuiting.
Protective Gear: Wear protective clothing and eyeglasses.
Check Battery: Inspect for visible damage (cracks, dents, deformation). Ensure connector contacts are clean, dry, and free of corrosion. Reverse polarity WILL destroy the battery; use a multimeter to determine proper polarity.
Cable Sizing: Use high-stranded copper, heavy-gauge cables to handle loads. Maintain identical cable lengths.
Install Terminals: Verify battery polarity. Always finish negative terminals before positive ones. Connect batteries in series or parallel as needed.
Connect to Devices: Connect the battery to other system components.
Tighten Connections: Ensure connections are secure. Over-tightening can cause terminal breakage; loose connections can cause terminal meltdown or fire.

Diagrams:

For Batteries in Parallel

Diagram shows two batteries connected in parallel. Positive terminals are connected together and to a battery fuse, then to an inverter, DC-DC charger, DC distribution panel, and charge controller. Negative terminals are connected together.

For Batteries in Series

Diagram shows two batteries connected in series. The positive terminal of the first battery is connected to the negative terminal of the second battery. The negative terminal of the first battery connects to the system (via fuse, inverter, etc.), and the positive terminal of the second battery connects to the system.

Battery Operation

Batteries may arrive at a partial state of charge. Fully charge before first use.
Standard Charging: Charge at 0.5C constant current until 14.4V, then constant voltage at 14.4V, tapering current. Charging complete when current tapers to 0.05C. Safe charging temperatures: 0°C to 55°C (32°F to 131°F). Approx. 2.5 hours.
Standard Discharging: Discharge at 0.5C constant current until 10V. Safe discharging temperatures: -20°C to 60°C (-4°F to 140°F).

Battery Storage

Charge to 30%-50% for storage. Store in an open, well-ventilated, dry, clean area at around 25°C (77°F).
Long storage can degrade performance. Charge at least every three months to prevent over-discharge.

Battery Management System (BMS)

The BMS protects the battery from over-discharge and short circuits by shutting it down. In such cases, the battery may show 0V. Activate the battery using an external charger with lithium battery activation. Contact Renogy Tech Support at (909)287-7111 for BMS information.

Battery Specifications

General Specifications

Parameter	Value
Model	RBT1250LFP
Nominal Voltage	12.8V
Rated Capacity (0.5C)	50Ah
Energy	640Wh
Specific Energy	116.36Wh/kg
Internal Resistance	≤20mΩ
Cycle Life	≥3500 Cycles (25°C, 0.5C, DOD 80%, EOL 80%)

Charging Parameters

Parameter	Value
Charge Voltage	14.4V (±0.2V)
Maximum Continuous Charge Current	50A
Charge Cut-off voltage	14.6V

Discharging Parameters

Parameter	Value
Maximum Continuous Discharge Current	50A
Discharge Cut-off Voltage	10V

Temperature Parameters

Parameter	Condition
Operation Temperature Range (60±25% R.H.)	Charge: 0°C to 55°C / 32°F to 131°F
	Discharge: -20°C to 60°C / -4°F to 140°F
	Recommended: 23°C (±5°C) / 73.4°F (±9°F)
Storage Temperature Range (60±25% R.H.)	-25°C to 65°C / -13°F to 149°F

Mechanical Properties

Parameter	Value
Length	198 mm / 7.8 in
Width	165 mm / 6.5 in
Height	169 mm / 6.7 in
Weight	5.35 kg / 11.8 lbs
Housing Material	ABS+PC
Terminal Model	M8 x 1.25 x 16 mm
Additional Terminal Model	M8 x 1.25 x 20 mm

Protection Circuit Module (PCM) Specifications

Battery Operating Status		Condition (For Reference Only)
Battery Cell Overvoltage Protection	Trigger	Battery Cell Voltage ≥ 3.65V
Battery Cell Overvoltage Protection	Recover	Battery Cell Voltage ≤ 3.55V / Discharge current ≥ 1A
Battery Cell Undervoltage Protection	Trigger	Battery Cell Voltage ≤ 2.3V
Battery Cell Undervoltage Protection	Recover	Battery Cell Voltage≥2.7V / Charge current ≥ 1A
Charge High Temperature Protection	Trigger	Battery Temperature ≥ 131°F (55°C)
Charge High Temperature Protection	Recover	Battery Temperature ≤ 122°F (50°C)
Discharge High Temperature Protection	Trigger	Battery Temperature ≥ 149°F (65°C)
Discharge High Temperature Protection	Recover	Battery Temperature ≤ 131°F (55°C)
Charge Low Temperature Protection	Trigger	Battery Temperature ≤ 32°F (0°C)
Charge Low Temperature Protection	Recover	Battery Temperature ≥ 41°F (5°C)
Discharge Low Temperature Protection	Trigger	Battery Temperature ≤ -4°F (-20°C)
Discharge Low Temperature Protection	Recover	Battery Temperature ≥ 5°F (-15°C)
Charge Overcurrent Protection	Trigger	Charge current ≥ 65A (Delay 5s)
Charge Overcurrent Protection	Recover	Disconnect the charger or Discharge current ≥ 1A
Discharge Overcurrent Protection	Trigger	Disharge current ≥ 165A (Delay 0.5s)
Discharge Overcurrent Protection	Recover	Disconnect the load or Charge current ≥ 1A
Short Circuit Protection	Trigger	Discharge current ≥ 600A
Short Circuit Protection	Recover	Remove Short Circuit (400µs) or Charge current ≥ 1A

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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

EU Representative

Company: eVatmaster Consulting GmbH

Address: Battinastr. 30, 60325 Frankfurt am Main, Germany

Contact: contact@evatmaster.com

UK Representative

Company: EVATOST CONSULTING LTD

Address: Suite 11, First Floor, Moy Road Business Centre, Taffs Well, Cardiff, Wales, CF15 7QR