Sphere MPPT 12V/24V 20A Solar Charge Controller

The Sphere MPPT 12V/24V 20A Solar Charge Controller is the ultimate solution for optimal solar energy conversion. Its innovative MPPT technology allows for rapid tracking and capture of the maximum power point of multi wave peaks, resulting in an impressive 94% energy conversion efficiency — higher than 75% of PWM solar controllers. Safety is a top priority, so this controller is packed with protections such as reverse polarity, over-charge/discharge, over-load/temperature, back feeding (night), and short circuit protection.

Key Features

• MPPT technology with up to 99% tracking efficiency and 94%+ conversion efficiency
• 12V/24V auto-detection — works with both system voltages
• 20A rated charge and discharge current
• USB output: 5V 1A for device charging
• Comprehensive protection: reverse polarity, over-charge, over-discharge, overload, over-temperature, back-feed (night), and short circuit
• Wide working temperature range: -35°C to +55°C
• Compact and lightweight: 131 × 99.5 × 29.5 mm, 300g

• System Voltage: 12V / 24V (auto-detect)
• Rated Charge Current: 20A
• Rated Discharge Current: 20A
• MPPT Tracking Efficiency: Max 99%
• Energy Conversion Efficiency: 94%+
• USB Output: 5V 1A
• Working Temperature: -35°C to +55°C
• Dimensions: 131 × 99.5 × 29.5 mm
• Weight: 300g

What is MPPT?

Maximum Power Point Tracking (MPPT) is a technology used in solar charge controllers to maximise the energy harvested from solar panels. Unlike older PWM controllers, MPPT continuously adjusts the electrical operating point to extract the highest possible power from your panels — even in partial shade or variable conditions.

Is it compatible with my system?

The Sphere 20A controller automatically detects whether your system is 12V or 24V, making it suitable for most caravan, RV, and off-grid setups. Check that your solar panel's open-circuit voltage does not exceed the controller's maximum input rating.

What protections are built in?

This controller protects against reverse polarity, over-charge, over-discharge, overload, over-temperature, back-feeding at night, and short circuit — making it a safe and reliable choice for unattended solar setups.