If possible adjust the voltage setting on the controller.
For lead acid storage
in the tropics, set the voltage at a point where no gas is given off or ~13.2V. That way you will return to wet batteries.
batteries, use the float voltage for the batteries. This varies with manufacturer and temperature. We use ~13.6V.
There is always a possibility that the drain hole in the bilge
will become plugged. Keeping your batteries up and your bilge
pumps active is advised.