This solar panel charge controller has built-in overcurrent protection, short circuit protection, open circuit protection and reverse protection. Charging and discharging parameters are adjustable. Light control and delay are adjustable. Double MOS anti-intrusion circuit, ultra-low heat generation, low failure rate. Large LCD display solar charge controller for easy setup and operation. Rated current: 20A Operating temperature: -35C to +60C Application: Household, industrial and commercial current< p>Standby: The charging symbol does not light up. The mode setting is incorrect. Reset it. Battery voltage is too low to charge Charging logo flashes slowly charging overcurrent reduces charging power Load ID flashes quickly Short circuit protection to eliminate short circuit After auto recovery Controller won't turn on Battery voltage is too low /reverse connection to replace battery/check reverse connection Safety Tips: 1. Control The device automatically adapts to 12V/24V (or 48V). When installing for the first time, please make sure the battery has enough voltage for the controller to recognize the correct battery type 2. The controller should be installed as close to the battery as possible to avoid voltage drops caused by excessively long wires. Affecting normal voltage judgment 3. This controller is only used for various lead-acid batteries (including bottle openers, seals, gels, etc.) Do not use for other batteries (including lithium batteries, NiMH batteries, etc.) are charged. ) 4. The controller can only use photovoltaic panels as a charging source, please do not use DC or other power sources as a charging source