MPPT Solar Panel Controller Module for intelligent, efficient battery charging and stable power output Key benefits Maximizes energy harvest from a solar panel using MPPT technology to improve conversion efficiency and shorten charge time. Flexible charging for single or multi cell battery packs with selectable output voltages to match common lithium battery configurations. Compact and durable design for integration into portable chargers, emergency lighting, small UPS units, and field equipment. Main features MPPT function for smarter solar charging and better conversion from panel to battery. Supports single or multi cell battery packs, including lithium ion, LiFePO4, and lithium titanate configurations. Two input/output ranges available: Input 12 to 28 V, output adjustable 1.2 to 11 V with preset options including 3.6 V, 4.2 V, 4.3 V, 4.35 V and 8.4 V. Input 7 to 28 V, output adjustable 1.2 to 21 V with preset options including 3.6 V, 4.2 V, 4.3 V, 4.35 V, 8.4 V, 12.6 V, 16.8 V and 21 V. Maximum load current 1 A; output current can be changed by replacing the Rcs resistor to match specific applications. Can operate without a battery present and act as a stable voltage source for powering loads directly. Automatic charging management and battery overvoltage protection to prevent overcharging. CR LED status indicator for simple visual monitoring. Wide ambient temperature range from 40 C to +85 C. Compact size 45 x 20 x 15 mm for easy installation in tight spaces. Typical applications Small off grid solar chargers for 12 V or 18 V battery systems and portable battery packs. Emergency lamps and camping lighting that require safe, adjustable charging and direct solar powering when a battery is absent. Portable UPS and backup power for routers, small industrial controllers, and hand held equipment using lithium cells. Standalone chargers for lithium ion, LiFePO4, or lithium titanate battery packs used in mobile speakers, electric chargers, and field instruments. What is included 1 x MPPT Solar Panel Controller Module Technical summary Item type: MPPT Solar Panel Controller Module Input voltage: DC 12 to 28 V or DC 7 to 28 V depending on model Output voltage: DC 1.2 to 11 V adjustable or DC 1.2 to 21 V adjustable depending on model. Preset selectable voltages: 3.6 V, 4.2 V, 4.3 V, 4.35 V, 8.4 V, 12.6 V, 16.8 V, 21 V (availability depends on selected model) Maximum load current: 1 A (adjustable by changing Rcs resistor) LED indicator: CR status indicator Ambient temperature: 40 C to +85 C Size: 45 x 20 x 15 mm Notes for use Verify input and output voltage ranges for the selected module version before connecting to a battery or load. Adjust output current by changing the Rcs resistor only if you are familiar with component replacement and current sensing.