Lead-to-Lithium

Lead-to-Lithium Battery 12.8V 300Ah

Model: SCLFP-12.8V-300

Lead-to-Lithium Battery 12.8V 300Ah - Lead-to-Lithium series product image
The Lead-to-Lithium Battery 12.8V 300Ah (model SCLFP-12.8V-300) is the highest-capacity 12V drop-in replacement in CMJ Solar's Lead-to-Lithium series, delivering 3840Wh from a 52.2 by 26.8 by 22 centimeter chassis with a 200A discharge current. Engineered for serious off-grid, marine, and RV applications, this 300Ah battery can power 12V refrigerators, inverters, anchor winches, and entire cabin loads for extended periods without recharging. It directly replaces two or more parallel lead-acid batteries in a single compact footprint, saving weight and eliminating the maintenance and ventilation concerns of flooded cells. The LiFePO4 chemistry supports 2000 to 4000 deep cycles with a flat discharge curve, and the built-in 200A BMS provides robust cell balancing and protection. The 12.8V nominal voltage works with standard 12V charging systems, making the upgrade truly plug-and-play. Each battery carries CE, UN38.3, and MSDS certifications and is covered by a 5-year warranty. For distributors targeting serious off-gridders, liveaboard sailors, and luxury RV owners, the 12.8V 300Ah is a flagship deep-cycle SKU. CMJ Solar, based in Jiangmen, Guangdong, provides factory-direct wholesale pricing and OEM services. Request a quote at cmjsolar.com.

Product Overview

Is the SCLFP-12.8V-300 the Right Capacity for You?

Best suited for

At 3840Wh, the 12.8V 300Ah is built for long-duration autonomous sites that run inverters, fridges, lighting, and entertainment for days without recharge: remote homesteads, farms and lodges, telecom and surveillance hubs, and large marine or RV banks. Its 200A continuous rating (around 2500W) gives real headroom for AC appliances and motor startup while the oversized capacity means the pack rarely sees deep cycling.

Typical loads this capacity handles

Typical loads for the 300Ah pack: three to five days of full living loads — fridge, lighting, cooking appliances via a 2kW inverter, pumps, and entertainment — between charges, depending on solar. It starts and runs heavier motors that smaller packs refuse. Because of its weight and size, buyers typically plan a fixed installation point rather than a portable location.

Estimated runtime

Runtime example: roughly 3,450Wh usable. A 150W household load runs for about 23 hours and a 300W load for roughly 11 to 12 hours; at typical average living draw of 100W the pack approaches 34 hours, extending to several days when solar tops it up during daylight.

Sizing advice

Select the 300Ah where charging happens only every few days — weak solar seasons, generator-top-up sites, or weekend recharge cycles. The large 52.2 by 26.8 by 22 cm, single-pack design replaces a parallel pair and removes balancing between separate batteries. For typical single-night 12V needs it is oversized; the 100Ah or 200Ah will be lighter and far more cost-effective.

Technical Specifications

Voltage
12.8V
Capacity
300Ah3840Wh
Discharge Current
200A
Battery Type
LiFePO4
Dimensions
52.2*26.8*22CM

Key Advantages

  • ✓300Ah3840Wh of Grade A LiFePO4 storage with about 90% usable energy and 2000-4000 cycle life
  • ✓Standard drop-in footprint that replaces lead-acid batteries with no tray or wiring modification
  • ✓5-year warranty with CE, UN38.3, and MSDS certification as standard
  • ✓Factory-direct wholesale pricing and full OEM/ODM customization from CMJ Solar

Applications

Home Solar Backup
Off-grid Power Supply
Commercial Energy Storage
Unstable Grid Areas
Solar Energy Systems
Industrial Backup

Shipping & Warranty

Worldwide Shipping

Global shipping via sea freight and express courier. FOB Shenzhen or EXW Jiangmen terms available. Production lead time 10-20 days depending on order volume and customization requirements.

Warranty & Support

5-year warranty on battery systems. LiFePO4 cells rated for 2000-4000 cycles. BMS protection, WIFI monitoring, and technical support included. Spare parts available throughout warranty period.

Frequently Asked Questions

What warranty does this product come with?

The Lead-to-Lithium Battery 12.8V 300Ah comes with a 5-year warranty covering the LiFePO4 battery cells and integrated BMS. Our LiFePO4 cells are rated for 2,000-4,000 charge-discharge cycles, providing 5-10 years of reliable daily use under normal operating conditions. Spare parts and technical support are available throughout the warranty period.

What is the MOQ (Minimum Order Quantity)?

The MOQ is typically 20 units per model for standard products. Sample orders of 1 unit are welcome for testing and evaluation. For OEM/ODM custom packaging or private labeling, the MOQ is 500 units. Contact our sales team for specific pricing based on your order volume.

How long can the Lead-to-Lithium Battery 12.8V 300Ah power my home during an outage?

The Lead-to-Lithium Battery 12.8V 300Ah provides 3,840Wh of stored energy (approximately 3,456Wh usable at 90% depth of discharge). At an average essential-load draw of 500W (lights, router, refrigerator, and TV), it can sustain power for approximately 6.9 hours. At 1,000W, runtime is approximately 3.5 hours. Actual runtime depends on total connected load and usage patterns.

Is this a direct drop-in replacement for lead-acid batteries?

Yes. The Lead-to-Lithium Battery 12.8V 300Ah is designed as a direct drop-in replacement for equivalent lead-acid batteries. It matches the standard form factor and terminal positions of conventional lead-acid batteries while delivering 12.8V LiFePO4 chemistry. Simply remove the old lead-acid battery, place the LiFePO4 unit in the same compartment, and connect the existing cables. We recommend setting your charger or charge controller to the LiFePO4 charging profile for optimal performance and lifespan.

How long does the LiFePO4 battery last?

The LiFePO4 cells in the Lead-to-Lithium Battery 12.8V 300Ah are rated for 2,000-4,000 charge-discharge cycles before capacity drops to 80% of the original rating. In a typical daily-cycle residential application, this translates to 5-10 years of service life. LiFePO4 chemistry also offers superior thermal stability and safety compared to lead-acid or NMC batteries, with no maintenance required.

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