1. The controller is automatically suitable for 12V/24V lead-acid batteries. During the first installation, please make sure that the battery has sufficient voltage for the controller to recognize the correct battery type. 2. Install the controller as close to the battery as possible to avoid voltage drop caused by wires that are too long and affect normal voltage judgment. 3. This controller is only suitable for various lead-acid batteries (including openings, seals, gels, etc.), please do not use it with other batteries (including lithium batteries, nickel-hydrogen batteries, etc.) 4. The controller can only use photovoltaic panels as the charging source, please do not use DC or other power sources as the charging source. 5. The controller heats up when it is on. Please install the controller on a ...