battery voltage to remain at the floating charge set value. During the floating charge
stage, the battery is charged in a very low voltage to maintain full charge state of the
battery. In this stage, the load can get nearly all of the solar energy. If the load
exceeds the energy that solar panel can provide, the controller will not be able to
maintain the battery voltage in the floating charge stage. When the battery voltage is
as low as the recovery charge set point, the system will exit floating charge stage and
re-enter the fast charge stage.
2. Installation
2.1. Installation Precautions
◆Be very careful when installing the battery. When installing the vented lead-
acid battery, wear protective glasses. Once you touch the battery acid, rinse it with
clean water.
◆ Avoid placing metal objects near the battery to prevent battery short circuit.
◆ Acid gas may be generated when the battery is charged. So ensure good
ventilation.
◆ The battery may generate flammable gas. Please keep away from sparks.
◆ Avoid direct sunlight and infiltration of rainwater when installing outdoors.
◆ Poor connection points and the corroded wires may cause extreme heat to melt
the wire insulation layer, burn the surrounding materials, and even cause fire.
Therefore, it is necessary to ensure that the connectors are tightened, and the wires
preferably fixed with a cable tie to avoid loose connector caused by wire shaking.
◆ In system wiring, output voltage of the component may exceed the safety
voltage of human body. So, it is necessary to use insulated tools and ensure that the
hands are dry.
◆ Battery terminal on the controller can be connected with either a single battery,
or a pack of battery. Subsequent instructions in the manual are for a single battery,
but it also applies to a battery pack.
◆ Observe the safety recommendations of battery manufacturer.
◆ The system connection wires are selected according to the current density not
more than 4A/mm2.
◆ Make the controller grounded.
2.2. Wire Specifications
Wiring and installation must comply with national and local electrical code
requirements.
PV and battery connection wires must be selected according to rated current. Refer
to the following table for wiring specifications:
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