Abstract: To address the challenges of short battery lifespan, inadequate remote management capability, unstable data transmission, and high maintenance costs in the power supply systems of gas production well sites in remote oilfields, a high-reliability off-grid intelligent photovoltaic-storage microgrid system based on lithium iron phosphate batteries and a remote management platform was developed. The system integrates solar modules, energy storage units, and an intelligent monitoring platform, and achieves coordinated control of power generation, storage, and load through the optimization of photovoltaic and battery configurations. Real-time battery status monitoring, remote data transmission, and automated fault diagnosis functions are enabled to ensure stable long-term operation under unattended field conditions. Field tests confirmed significant performance improvements after system optimization: the data connectivity rate increased from 84.9% to 99.2% (a 14.3 percentage rise), charging efficiency improved from 70% to 85% (a 15 percentage increment), fault response time was reduced from 100 ms to 20 ms (a 80% reduction), backup power duration was extended from 24 h to 48 h, and annual maintenance costs decreased by 15% from 15 000 CNY to 12 750 CNY. Although previous studies have advanced photovoltaic-storage control strategies and battery management techniques, most existing systems still fall short of supporting long-term reliable operation in the harsh and unattended conditions of oilfield well sites. The proposed system significantly enhances power supply reliability, operational intelligence, and economic efficiency, demonstrating strong potential for engineering application and future deployment in remote energy infrastructures.