While it is technically possible to connect solar panels directly to batteries without a controller, it is not recommended for several reasons:

Battery Safety and Longevity:

Without a controller, there is a risk of overcharging and deep discharging the batteries, leading to potential damage, reduced lifespan, and increased maintenance costs.

Optimal Charging Efficiency:

Solar controllers optimize the charging process based on various factors, resulting in improved charging efficiency and overall system performance. Without a controller, the charging process may not be properly regulated, leading to suboptimal charging and reduced energy harvest.

System Protection:

Solar controllers provide important protective functions, such as disconnecting loads during critical battery voltage conditions. Without a controller, the system is more vulnerable to potential damage from voltage fluctuations or other irregularities.

SNADI's controller series，With the double MCUs, the product provides different charge voltage and charge current to realize charge managemen: for batteries of different types. Its mains supply preferred mode, energy-saving mode and battery preferred mode are all settable,thus making it easy to meet the different application needs of users.It has anLCD. It is widely applied to families, schools, streets.frontier defense, pasturing areas, industrial equipment, satellite communication equipment, military vehicle-borne equipment, ambulances, police cars, ships, etc.

MAIN FEATURES：

Excellent performance because of double MCU Intelligent design

Pure sine wave output for compatibility with loads of different types

Visualization of operation status of the equipment through a digital LCD

Wide input voltage range, high precision output, automatic voltage regulator function

Settable battery type and charge current for the charge management of batteries of different types of FT/FT-B

Settable mains supply preferred mode, energy-saving mode and battery preferred mode for easy meeting of the needs of different users

Overall protection functions (battery overvoltage protection, battery under voltage protection, overload protection,shortcircuit protection and over temperature protection

Conclusion:

Solar controllers play a crucial role in ensuring the safe, efficient, and reliable operation of solar systems. They protect batteries from overcharging and deep discharging, optimize charging efficiency, and provide monitoring and diagnostic capabilities.