LiFePO4 12.8V 300Ah For Solar energy system

2025-03-05

How to set up solar energy system by 4 sets 12.8V300Ah LiFePO4 Battery

First, we need to know the specification of 12.8V300Ah, then we can know how to make the connection for the power storage.

LiFePO4 12.8V 300Ah Specifications

Key Parameters

Parameter	Specification
Nominal Voltage	12.8V (Operating Range: 10V ~ 14.6V)
Full Charge Voltage	14.4V ~ 14.6V
Discharge Cut-off Voltage	10V ~ 10.5V
Capacity	300Ah (Total Energy: 12.8V × 300Ah = 3,840Wh ≈ 3.84kWh)
Charge/Discharge Current	- Continuous: 150A (0.5C) - Peak: 300A (1C, ≤30 seconds)
Cycle Life	- ≥2000 cycles (at 80% Depth of Discharge, DoD) - ≥6000 cycles (50% DoD for premium models)

Additional Details

Physical Dimensions: ~330mm (L) × 175mm (W) × 240mm (H)
Weight: ~30–35 kg
Operating Temperature:

Charging: 0°C to 45°C
Discharging: -20°C to 60°C

Safety Features:

Built-in BMS (Battery Management System) with overcharge/over-discharge/short-circuit/temperature protection.
LiFePO4 chemistry: Non-flammable, no thermal runaway risk.

Certifications: CE, UN38.3, RoHS, MSDS

Typical Applications

Solar energy storage systems
Off-grid power for RVs, boats, and cabins
Backup power (UPS)
Electric vehicles (golf carts, forklifts)

Second, we check other related equipments to solar panels, inverter, power control,MPPT, and so on, and match the rate of them.

What size solar power system can 4 sets of 12V 300Ah LiFePO4 batteries support?

Here’s a detailed explanation in English:

Step 1: Calculate Total Battery Capacity

Voltage: 12V × 4 batteries (typically arranged in series for a 48V system).
Capacity: 300Ah × 4 = 1,200Ah (if in parallel) or 300Ah (if in series for 48V).
Total Energy Storage:
$Energy (Wh) = Voltage \times Capacity = 48 V \times 300 A h = 14, 400 W h (14.4 k W h) .$

Step 2: Determine Solar Panel Capacity

To recharge the batteries daily (assuming 1 full cycle per day):

$Solar Panel Size (W) = \frac{Battery Energy (Wh)}{Sunlight Hours \times System Efficiency} .$

Sunlight Hours: Assume 4–6 peak sunlight hours (adjust based on location).
Efficiency: ~80% (due to losses in charging, wiring, and inverters).

Example:
For 5 sunlight hours:

$Solar Power = \frac{14, 400 W h}{5 \times 0.8} = 3, 600 W (3.6 k W) .$

Recommended Solar Capacity:

Minimum: 2,000W (to partially recharge batteries).
Optimal: 3,000–4,000W (for full daily recharge).

Step 3: Key Components

Solar Panels: 3,000–4,000W (e.g., 10×400W panels).
Charge Controller:

MPPT Type (supports 48V systems).
Current Rating: $\frac{4, 000 W}{48 V} = 83 A$ → Choose a 100A controller.

Inverter:

Power: 3,000–5,000W (to handle surge loads).
Voltage: 48V DC input.

Important Notes

Battery Depth of Discharge (DoD): LiFePO4 batteries can safely discharge to 80–90% DoD, increasing usable energy.
Scalability: Add more panels if energy demand grows.
Climate: Increase panel capacity by 20–30% for cloudy regions.

It is necessary to ensure the correct translation of technical terms, such as "Nominal Voltage" "Full Charge Voltage" for and "Discharge Cut-off Voltage" for Additionally, the cycle life "≥2000次" should be accurately expressed as "≥2000 cycles" and specify that it is at 80% DOD.

For physical characteristics, dimensions and weight should be converted to internationally recognized units if necessary, such as millimeters and kilograms. However, since the user's previous response already used millimeters and kilograms, they can remain unchanged.

It is also important to check for any missing parameters, such as operating temperature range, safety certifications, and application scenarios. While these were included in the user’s previous response, the current request may only require core parameters. However, for completeness, additional details may be necessary.

Furthermore, the translated specifications should remain professional and formal, suitable for technical documentation. Proper units and symbols should be used, such as V (Volt), Ah (Ampere-hour), Wh (Watt-hour), kWh (Kilowatt-hour), A (Ampere), etc.

Accuracy must be ensured to avoid misunderstandings, especially regarding current and voltage parameters, which are crucial for system design. For example, a continuous charge/discharge current of 0.5C (150A), a peak current of 1C (300A) for no more than 30 seconds, and similar conditions should be precisely translated and clearly stated.

In summary, the user requires an accurate, professional, and well-structured English version of the specifications, which may be used for procurement, technical documentation, or international communication. Each parameter should be carefully checked for correct translation, and the table should be neatly formatted to ensure clear and concise presentation.