Compact 5 V solar panel for small device charging and DIY home projects This polycrystalline silicon solar cell delivers a reliable, lowpower source of electricity for phones and other 5 V devices. Its compact size and fixed output make it easy to integrate into home improvement projects, emergency kits, and portable setups. Key benefits Reliable lowpower charging: Provides up to 5 V at 400 mA (2 W), suitable for trickle charging and running lowpower USB devices under good sunlight. Easy to install and integrate: Small footprint (142 mm x 85 mm) fits into tight spaces for mounting on windows, cabinets, or DIY housings. Durable polycrystalline construction: Solid panel material for everyday outdoor use and longterm projects without adding unnecessary complexity. Versatile for DIY and retrofit work: Straightforward electrical characteristics simplify pairing with regulators, power banks, charge controllers, or simple circuitry. What this panel does Outputs approximately 5 V and up to 400 mA under sunlight conditions, delivering 2 W of peak power for small electronics. Intended for use as a supplemental charger or power source, not as a primary power supply for demand devices. used with a proper charge controller, power bank, or regulator when charging batteries or powering sensitive electronics. Specifications Output voltage: 5 V Output current: 400 mA Peak power: 2 W Size: 142 mm x 85 mm Material: Polycrystalline silicon Primary function: Solar cell panel for phone charging and small device power Practical use scenarios Emergency phone up: Keep the panel in an emergency kit to provide a daytime trickle charge to a phone or small USB battery pack when mains power is unavailable. Home improvement projects: Integrate the panel into windowmounted or cabinetmounted setups to power sensors, small lights, or control circuits in workshops and garden areas. Outdoor and camping use: Mount on a backpack, tent, or shelter to maintain a trickle charge to a portable battery or lowpower USB devices during daytime activities. Installation and usage tips Position the panel in direct sunlight, angled toward the sun for results. Partial shade will significantly reduce output. Use a charge controller or power bank when charging batteries to prevent overcharge and to stabilize voltage. Observe polarity when connecting devices. Consider adding a blocking diode if the panel will be connected to batteries overnight to prevent discharge. For mounting, secure with brackets or adhesive compatible with the panel backing and the chosen surface. Avoid excessive bending or pressure on the cells. Who should consider this panel DIY hobbyists building small solar projects Home improvement users needing a compact supplemental power source Outdoor users and emergency preppers requiring a lightweight solar option for daytime charging This compact 5 V, 400 mA polycrystalline panel is a practical component for smallscale solar applications where simple, reliable performance is needed.