The 3240-G‘s most distinctive feature is its dedicated adaptation for 3.2V LiFePO₄ batteries. Compared to traditional lead-acid batteries, LiFePO₄ offers longer cycle life (2,000+ cycles), higher energy density, and superior safety — making it increasingly popular in off-grid lighting, portable energy storage, and solar street light applications.
Sukite has optimized its charging algorithm specifically for the 3.2V LiFePO₄ charge/discharge curve, enabling more precise control of charging voltage and current to prevent overcharging, deep discharge, and thermal stress — effectively extending battery life. For off-grid lighting systems, battery lifespan directly determines maintenance cycles and total cost of ownership, making this adaptation capability a tangible user benefit.
According to the product panel specifications, the 3240-G supports 3.2V battery systems — a low-voltage platform common in small off-grid lighting systems and portable solar devices. Its maximum charging current of 20A delivers substantial solar charging capacity for a 3.2V system. The maximum solar open-circuit voltage of 25V provides flexible series configuration options for solar panels while maintaining ample safety margin.
The 3240-G’s core feature is its built-in step-up constant current LED driver — denoted by the “G” suffix in the model number.
The LED output voltage range of 9V to 36V means the controller can boost the low voltage of a 3.2V battery to the operating voltage range required by LED strings. In real-world operation, battery voltage fluctuates with charge/discharge state; driving LEDs directly would result in highly unstable brightness and power consumption. The 3240-G‘s step-up constant current driver boosts and stabilizes the fluctuating battery voltage to a set value, delivering constant current output that ensures consistent driving conditions for the LED string regardless of battery state of charge — preserving both illumination quality and luminaire longevity.
The maximum load power of 40W forms an excellent match with the 20A charging capability. A 40W LED luminaire adequately covers medium-power lighting scenarios such as rural main roads, campus pathways, and courtyard lighting, balancing brightness with energy efficiency.
The value delivered by this integrated design is multifaceted: users no longer need to separately select and configure an LED driver power supply, reducing equipment selection complexity; the 2-in-1 design reduces hardware costs including enclosure, terminals, and internal circuit boards; and fewer devices and connection points mean fewer potential failure points, significantly enhancing system reliability.
As an MPPT solar charge controller, the 3240-G incorporates a maximum power point tracking algorithm. Solar panels exhibit non-linear output characteristics, with a maximum power point that shifts in real time with changes in irradiance, temperature, and shading. The 3240-G’s MPPT algorithm continuously monitors the panel‘s voltage and current, dynamically adjusting the operating point to ensure the PV array consistently operates at maximum power output.
Compared to traditional PWM controllers, MPPT technology can improve charging efficiency by 20% to 30% , with the advantage particularly pronounced under rapidly changing light conditions. For solar-dependent off-grid lighting systems, higher charging efficiency directly translates to shorter charging times, more fully charged batteries, and longer nighttime illumination duration.
With its 3.2V LiFePO₄ system, 20A charging, 40W load, and 9V-36V step-up constant current driver specifications, the 3240-G offers distinct advantages in the following application scenarios:
Medium-power off-grid road lighting: A 40W LED luminaire adequately covers rural main roads, campus roads, and community road lighting needs. The 20A charging capability ensures stable system operation even in regions with moderate sunlight conditions.
Off-grid lighting in Africa and Southeast Asia: In areas with inadequate grid coverage, solar lighting systems are a basic daily necessity. The 3240-G’s 3.2V LiFePO₄ compatibility and step-up constant current driver capabilities align perfectly with the medium-power solar lighting devices prevalent in these regions.
Solar courtyard and campus lighting: Outdoor lighting for villa gardens, factory premises, and school campuses typically demands higher brightness and reliability. The 3240-G‘s 40W load capacity meets the long-term operational requirements of these scenarios.
The Sukite 3240-G MPPT solar charge controller combines “3.2V LiFePO₄-specific charging + 20A high current + 40W load + step-up constant current LED driving” to deliver a highly integrated control solution for medium-power off-grid lighting applications. It is neither a standalone charge controller nor an independent LED driver power supply — it is a comprehensive control solution designed from a system-level perspective, purpose-built for real-world application scenarios.
For system integrators and contractors planning off-grid road lighting, campus lighting, or power upgrades to existing systems, the 3240-G is a practical choice worthy of serious consideration.
Model: Sukite 3240-G MPPT Solar Charge Controller
Core Functions: MPPT Maximum Power Point Tracking + 3.2V LiFePO₄-Specific Charging + Step-Up Constant Current LED Driver (9V-36V)
Target Applications: 3.2V LiFePO₄ Off-Grid Lighting Systems (≤40W Load)
Key Specifications: Max. Charging Current 20A / Max. Solar Voc 25V / Max. Load Power 40W
Manufacturer: Dongguan Sukite New Energy Lighting Co., Ltd. (Sukite)
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