4 Pack Vacuum Cleaner HEPA Filters for Cyclonic Series RO3753EA RO3731EA RO3786EA Solar Charge Controller for managing battery charging which helps to increase a batteries lifetime by preventing overcharging.<br> Batteries must be 12V or 24V. Controller does not charge a 12V and 24V battery.<br> Built in Industrial Microcontroller.<br> State of charge (SOC) showing battery condition.<br> Pulse Width Modulation with four stages of charging.<br> Short circuit, Reverse current, Reverse polarity, Overcharge protection.<br> Fine workmanship and good performance.<br> Easy to use.<br> Long service life.<br> Current: 10A / 20A / 30A<br> System voltage: 12V/24V adaptive<br> Maximum photovoltaic voltage: 41V<br> Voltage drop of charging circuit: Less than 0.2V<br> Boost charging voltage: 14.6V (only for 12V system, if using 24V system, please x2)<br> Direct charging voltage: 14.5V (only for 12V system, if using 24V system, please x2)<br> Constant voltage charging voltage: 14.2V (only for 12V system, if using 24V system, please x2)<br> Float voltage: 13.8V (only for 12V system, if using 24V system, please x2)<br> Charging recovery voltage: 13.0V (only for 12V system, if using 24V system, please x2)<br> Adjustment method: PWM<br> Standby current:Less than 10mA<br> Temperature Compensation: N/C<br> Working temperature: -35~+60℃<br> Colour:As Shown<br> Material:plastic<br> Package Contents:<br> 1 x Solar Charge Controller<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.