Compact solar charge controller designed for use only with photovoltaic panels. This regulator provides reliable battery charging and device power via dual USB ports, and is suitable for small solar generators and off grid systems. Key benefits Designed for photovoltaic panels only: connects directly to solar panels to manage charging and protect batteries. Simplified battery support: automatic 12V and 24V identification for easy setup and operation. Selectable battery modes: b1 for general battery charging with 12V or 24V automatic detection, b2 for lithium ion batteries, b3 for lithium iron phosphate batteries. Dual USB output: charges mobile devices or accessories directly from the system without extra adapters. Durable construction and compact design: built to last and fit into small installations while improving conversion rates for solar generator systems. Easy installation guidance: mount on a flat, well ventilated surface to ensure stable operation. Functions and compatibility Charge regulation for photovoltaic input to battery storage and solar generators. Automatic voltage recognition between 12V and 24V systems. Battery type selection for lead type or common battery, lithium ion, and lithium iron phosphate using modes b1, b2, and b3. Dual USB ports for powering or charging external devices while regulating battery charge. Performance and installation Compact footprint for installation in compact power boxes, solar generator housings, or vehicle mounts. Install on a flat and ventilated surface to maintain heat dissipation and long term reliability. Intended for use only with photovoltaic panels; do not connect to other power sources. Practical use scenarios Remote cabin power: connect a photovoltaic panel and a battery to supply lighting and charge phones through the dual USB ports while the controller maintains correct battery charging modes. RV or camper setup: integrate with a small solar generator and battery bank to support auxiliary loads, with automatic 12V or 24V recognition for flexible system configurations. Portable workshop or outdoor event: pair with a portable solar panel and battery to provide device charging and regulated power for tools and accessories. What to expect A straightforward solar regulator that manages charging, supports common battery chemistries via modes b1, b2, and b3, and provides convenient USB charging. Follow installation guidance and use only with photovoltaic panels for proper operation.