Compact PWM Solar Charge Controller for 6V and 12V Systems Key benefits Simple, reliable charging for small solar systems. Protects and maintains 6V or 12V battery banks for off grid lighting, small RVs, boats, and backup power. Low standby drain and minimal voltage drop preserve battery capacity and improve overall system efficiency. Builtin protections reduce the risk of overload, short circuit, and incorrect wiring while allowing automatic recovery after transient faults. What this controller does Provides PWM charging control for 6 volt and 12 volt PV systems. Selectable options support small system currents and lithium battery configurations for flexible compatibility. Monitors charge and discharge circuits with very low no load current to limit parasitic losses. Key specifications and options System voltage: 6 V or 12 V. Current options: 5 A or 10 A models for standard 6 V / 12 V lead acid type systems. Lithium battery options (5 A): 11.1 V for 3 cell lithium packs, and 12.8 V for 4 cell lithium iron phosphate packs. Charging mode: PWM. Input power: up to 30 W for 5 A model, up to 60 W for 10 A model. Input withstand voltage: less than 30 V. Overload and short circuit protection: controller will cut off after 5 minutes at 1.5 times rated current and will automatically recover after 5 minutes. Additional short circuit protection: triple rated current action at rated voltage. No load current: less than 6 mA. Charging circuit voltage drop: up to 0.02 V. Discharge circuit voltage drop: up to 0.01 V. Operating temperature: 30 C to +55 C. Storage temperature: 45 C to +70 C. Humidity: up to 90 percent relative humidity, no condensation. Size: 53.4 x 68.6 x 22.0 mm. Important wiring and safety note Connect in this for normal operation: battery first, then solar panel, then load. Observe correct polarity for all connections. If polarity is reversed, the controller indicator will not show but internal components will not be damaged. Practical applications Small camper or caravan: Maintain a single 12 V leisure battery used for lights, USB charging, and small appliances while parked or boondocking. Remote cabin or garden lighting: Keep a 6 V or 12 V battery topped up by a compact solar panel to power LED lighting and sensors. Marine and vehicle accessory backup: Provide managed charging for a small auxiliary battery on boats, trailers, or service vehicles where space is limited. Why choose this model Compact footprint makes installation in tight enclosures easy. Low power consumption and minimal circuit voltage drop help maximize usable battery energy. Multiple voltage and current options allow matching to common lead acid and selected lithium battery types without unnecessary complexity. What to verify before Match the controller model to your system voltage (6 V or 12 V) and required current (5 A or 10 A). If using lithium batteries, choose the appropriate 11.1 V (3 cell lithium) or 12.8 V (4 cell lithium iron phosphate) 5 A option. Ensure panel open circuit voltage is below 30 V to avoid exceeding the input withstand rating. This controller offers a compact, low loss PWM charging solution for small standalone solar systems with straightforward protections and flexible battery compatibility.