Compact MPPT Solar Charge Controller for 12V and 24V Systems Summary A microcontrollerbased MPPT solar charge controller available in a 20A version and a CPY10A 10A version. Automatically detects 12V or 24V systems and delivers conversion efficiency to charge batteries faster while protecting the battery and connected loads. Key benefits Higher charging efficiency: MPPT algorithm delivers up to 99 percent efficiency to maximize energy harvest from solar panels. Smart, reliable control: Singlechip microcomputer control provides intelligent battery management and stable operation. Comprehensive protection: Builtin protection for overload, short circuit, overvoltage, overdischarge, and reverse polarity reduces risk to battery and controller. Easy integration: Automatic 12V and 24V detection and compact size make installation straightforward for small offgrid systems. Models and electrical specifications 20A model Rated charge current: 20A Rated discharge current: 20A Rated voltage: 12V or 24V automatic detection Model CPY10A Rated charge current: 10A Rated discharge current: 10A Rated voltage: 12V or 24V automatic detection Common specifications (applies to both models unless noted) MPPT efficiency: up to 99 percent USB output: 5V, 1A; standby current less than 10mA Overload and short circuit protection: triggers at 1.5 times the rated current or higher Over voltage protection: 16V for 12V systems; 32V for 24V systems Stop charging voltage: 14.7V for 12V systems; 29.4V for 24V systems Discharge recovery voltage: 12.2V for 12V systems; 24.4V for 24V systems Over discharge voltage: 10.8V for 12V systems; 21.6V for 24V systems Physical size: approximately 132 x 100 x 28 mm Weight: approximately 291 g Installation and operation notes Connection : Always connect the battery first, then connect the solar panel, and finally connect the load. Reverse polarity: The controller has internal reverse polarity protection, but incorrect connections can still damage the unit. Doublecheck wiring before powering. Ratings check: Ensure solar panel voltage and system current are within the rated range of the selected controller model. What is included Solar controller x1 English manual x1 Typical applications Small offgrid solar lighting and power for garden sheds, security lights, and remote lighting circuits. Battery charging for camper vans, RV auxiliary batteries, and small marine systems running 12V or 24V loads. Offgrid cabins, remote instruments, and small telemetry or monitoring stations where reliable, efficient charging and basic load control are required. Why choose this controller This MPPT controller offers efficiency and a compact footprint with intelligent microcontroller management and multiple protections. It is suited for users who need reliable battery charging and simple load support in small 12V or 24V solar systems.