1. 30A MPPT solar charge controller using innovative MPPT technology with high tracking efficiency up to 99%; please refer to the information if you are not familiar with Mppt technology: there are many kinds of MPPT technology our solar controller Mppt technology is to detect the maximum charging current not the boost type or the automatic charging of the solar panel voltage. 2. Multi-function LCD displays system information intuitively; this controller is 12V/24V automatically adapt first connect the battery then connect the solar panels when you first use it make sure the battery has enough voltage so that the controller can recognize the correct battery type3. Reliable protecting: overvoltage short circuit overload overcharge over discharge protecting function; automatic focusing MPPT tracking charging high charging efficiency non-stop detection during charging bidirectional focusing tracking.4. Industrial-grade master chip 16 AD sampling accuracy temperature charging current discharge current accurate real-time display power generation at a glance.Note: Please note the connection ways connect the battery first then connect the solar panel( you can't reverse the order). Specification:Weight: 322gSize: 8.9*4.3*2cmmaterial: plasticincludes:1 x Solar Charge Controller