This alarm that you are hearing is caused from a low voltage from the battery. These systems create some confusion to the consumer due to the fact that the switch on the controller must be in the On position in order for the panels to recharge the system. Naturally customers turn the switch off to turn the lights off when not in use cutting the power off from the panels and obviously not allowing them to charge the battery. To fix this problem you must unplug the lights from the controller to turn them off instead of turning the switch off. This allows the panels to still recharge the battery without the lights causing a drain on the battery.

Also panels position is very important. If placed in an unsuitable area, trees, buildings, plants and etc could cast shadows on the panel causing it to not receive the required UV isolation optimally resulting in the panel not producing power to recharge the battery. These panels should be positioned at a 45 degree angle facing True South with no obstructions casting shadows across the panels