828V 5A 100W Solar Panel Regulator Controller with automatic 9V / 12V / 24V switching A compact solar panel regulator/controller that simplifies solar charging for small systems. It accepts solar panel input from 8–28V, supports up to 5A of charging current and 100W of panel power, and automatically selects the appropriate charging voltage among 9V, 12V and 24V. This controller removes the need for manual voltage selection, making setup faster and reducing the risk of incorrect settings. Key benefits Automatic voltage selection: the controller detects and switches automatically between 9V, 12V and 24V systems so you don't need to configure the output manually. Wide input range and clear limits: works with solar panels with opencircuit/input voltages from 8V to 28V and accepts up to 5A and 100W, suitable for many small offgrid and auxiliary applications. Simple integration: designed to be placed between a solar panel and a battery or load to regulate charging behavior according to the detected nominal system voltage. Versatile compatibility: supports devices and battery systems that operate at the standard nominal voltages listed (9V, 12V, 24V) within the stated input and power limits. Key attributes and specifications Input voltage range: 8–28V Maximum charging current: 5A Maximum panel power: 100W Automatic switching: supports 9V, 12V and 24V nominal systems with automatic detection and switching Function: solar panel regulator/controller for charging and supplying compatible battery systems and loads Performance: rated to manage up to 5A continuous charge current and up to 100W of solar input when used within the 8–28V range Compatibility and usage notes Use with solar panels whose maximum operating voltage and power fall within the controller's 8–28V and 100W limits. Intended for systems that use nominal 9V, 12V or 24V batteries or loads; the controller switches automatically to the correct nominal charging voltage. Not suitable for systems that require higher charging current than 5A or more than 100W of solar input. Verify panel and battery specifications before installation. Typical applications Small offgrid lighting and accessory circuits: maintain and charge 12V accessory batteries for cabins, sheds or tiny houses with a small solar array. Mobile and recreational use: charge or maintain 12V leisure batteries on boats, motorcycles or campers where compact control and automatic voltage selection simplify installation. Remote sensors and lowpower equipment: provide regulated charging for 9V/12V/24V sensor packs or equipment in field installations where panel size and power are limited. Installation overview Connect the solar panel to the regulator input and the battery or load to the regulator output following correct polarity. The controller will detect the nominal system voltage (9V, 12V or 24V) and adjust charging accordingly. Confirm that the solar panel voltage and wattage do not exceed the stated 8–28V and 100W limits, and that expected charging current does not exceed 5A. This regulator/controller provides a straightforward, automatic solution for small solar charging setups that require 9V, 12V or 24V operation within the stated electrical limits.