QOLTEC MPPT 15A Solar Charge Controller 12V/24V for LiFePO4, Gel, AGM, Flooded, Sealed Lead-Acid with LCD and RS485

This QOLTEC MPPT solar charge controller stands out by combining a true Maximum Power Point Tracking algorithm with a 15A charge capacity and automatic 12V/24V system voltage detection, making it a versatile choice for off-grid solar installations. Unlike basic PWM controllers, it extracts up to 30% more power from your PV array, especially in low-light or cold conditions. The controller supports LiFePO4 lithium batteries as well as sealed lead-acid, gel, AGM, and flooded types, giving you flexibility for various energy storage setups.

Highlights

• Advanced MPPT technology with >99.5% tracking efficiency and >97% conversion efficiency
• Wide battery compatibility: LiFePO4, Sealed Lead-Acid, Gel, AGM, Flooded
• Backlit LCD display for real-time monitoring of voltage, current, and charging status
• RS485 communication port for PC or app-based monitoring and data logging
• Programmable DC load output with timer function for lighting or other DC appliances
• Comprehensive protection: overcharge, over-discharge, reverse polarity (PV and battery), overload, short circuit, and over-temperature
• Common negative grounding for easy system integration
• Wide operating temperature range: -20°C to +50°C

In daily use

The controller automatically recognizes 12V or 24V systems, so you can install it without manual voltage selection. Its 3-stage charging algorithm (bulk, absorption, float) ensures optimal battery charging and longevity. The LCD screen provides clear information at a glance, and the RS485 interface allows remote monitoring when paired with an optional adapter. The load output can be programmed with a timer, making it ideal for street lighting or timed DC loads. With self-consumption below 10mA, the controller adds minimal drain to your system.

Full specifications

• Charge Controller Type: MPPT
• Rated Charge Current: 15A
• System Voltage: 12V / 24V (Auto-sensing)
• Max PV Input Voltage (VOC): 50V
• Max PV Input Power: 200W (12V system) / 400W (24V system)
• Battery Types Supported: LiFePO4, Sealed Lead-Acid, Gel, AGM, Flooded
• MPPT Tracking Efficiency: >99.5%
• Charge Conversion Efficiency: >97%
• Self-Consumption: <10mA
• Charging Algorithm: 3-Stage (Bulk, Absorption, Float)
• Display: Backlit LCD
• Communication Interface: RS485
• Load Output: Yes, with programmable timer
• Protection Features: Overcharge, Over-discharge, Reverse Polarity (PV & Battery), Overload, Short Circuit, Over-temperature
• Grounding Type: Common Negative
• Operating Temperature Range: -20°C to +50°C
• Enclosure Rating: IP30

Final note

Engineered for reliability and efficiency, this QOLTEC controller is a solid foundation for small to medium solar power systems, whether for cabins, RVs, boats, or remote monitoring stations.