07
Attention:
When the system cannot maintain battery voltage steadily at constant voltage due to
installation environment or operation with load, the solar charge controller performs time
accumulation until battery voltage reaches the preset value. After the cumulative time reaches
three hours, the system automatically transfers to floating charging.
If the clock of the solar charge controller is not calibrated, the controller performs regular
equalizing charging in accordance with its internal clock.
Equalizing Charging
Warning: explosion!
Balance opening lead-acid batteries may produce explosive gas, and cabins of the
batteries must be well ventilated.
Attention: equipment damage!
Balance can push up battery voltage to a level that may damage sensitive DC load.
Verification is required to ensure that the allowed input voltage of all system loads is higher than
the set value of equalizing charging for batteries.
Attention: equipment damage!
Overcharging or too much gas evolution may damage battery plates and cause active
materials on battery plates to fall off. Damages may be caused if equalizing charging voltage is
too high or equalizing charging lasts too long. You are advised to carefully read the specific
requirements on batteries used in the system.
Some types of batteries benefit from regular equalizing charging, which can stir up electrolyte,
equalizing battery voltage, and complete chemical reaction. Equalizing charging boosts battery
voltage to a level higher than standard complement voltage, resulting in gasification of battery
electrolyte. If it is detected that the solar charge controller automatically controls the next
process to perform equalizing charging, equalizing charging duration will be 120 minutes
(default). Equalizing charging and boost charging are not repeated in one full charge process.
This is to avoid too much gas evolution or battery overheating.
Floating Charging
After a charging stage continues, the solar charge controller reduces battery voltage by decreasing
the charging current, and maintains battery voltage at the preset voltage value for floating charging.
At floating charging stage, the battery undergoes very weak charging to ensure that the battery is in
full charge state. At floating charging stage, the load can obtain nearly all the solar power. If the load
exceeds the power provided by solar energy, the solar charge controller fails to maintain battery
voltage at floating stage. When battery voltage is as low as the preset value for improved recovery
charging, the system exits from floating charging stage and re-enters fast charging stage.
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08
2. Product Installation
2.1 Installation Precautions
Exert great caution during battery installation. Before installing open lead-acid battery, wear
protective goggles. When you are in contract with battery acid liquid, wash the involved part with
water immediately.
Do not place metal objects near battery to prevent short circuit.
When battery is charging, acidic gas can be produced. Ensure that the environment around is well
ventilated.
Battery may generate combustible gas. Keep it away from sparks.
For outdoor installation, avoid direct sunlight and rain infiltration.
Loose connections and corrosive wires may cause extreme heat that melts wire insulation layers,
burns surrounding materials, or even results in fire. Ensure that connection heads are screwed
tight, and wires are better fixed with tightening belts. Avoid wire shaking and loose connection
heads when moving the application.
When the system is connected, the output terminal voltage of components can be higher than
human safety voltage. During operation, use insulated tools and make sure your hands are dry.
The battery terminals on the solar charge controller can be connected with one battery or the same
set of batteries. Follow-up instructions in the manual apply to the use of single battery. The same
instructions apply to a system with a set of batteries as well.
Please follow battery manufacturers' safety recommendations.
System connecting line is selected according to current density of no greater than 4A/mm2.
Connect the solar charge controller grounding terminal to the ground.
2.2 Wiring Specifications
Wiring and installation mode must comply with national and local electrical standard requirements.
Battery and load specifications must be selected according to the rated current. Refer to the following
table for wiring specifications:
Model
ML4830N15
Rated Charging Current
30A
Battery Wire Diameter
8
Load Line Diameter
5
Rated Discharging Current
20A mm2
2.3 Installation and Wiring
Warning: Explosion risk. Do not install the solar
charge controller and open type cell in the same
closed space. Do not install in closed place where
battery gas may gather.
Warning: High pressure danger. Photovoltaic
array may generate very high open circuit
voltage. Before wire connection, disconnect the
breaker or insurance. Be careful in the process of
wiring.
!
Attention: When installing a solar charge
controller, make sure there is enough air flowing
through the cooling fin of the controller. Leave a
space of at least 150 mm up and down the solar
charge controller to ensure natural heat loss
through convection. If installed within a closed
cabinet, ensure reliable heat dissipation through
the cabinet body.
≥150mm Hot Air
≥150mm
Figure 2-1 Installation and
Heat Dissipation
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mm2
Cold Air
