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4. Three-stage charging algorithm:
The unit provides a 3-stage charging algorithm having a Bulk, then Absorption and then Float stage
sequence. During the Bulk stage, the battery accepts all the possible current from the solar panel
(if available) in an effort to charge the battery and so raising its voltage. Once the battery voltage
reaches the maximum one
stage, keeping that maximum voltage by reducing the charging current if necessary under a PWM
regulation approach. When entering the Absorption stage, a two-hour timer starts running. During
that period, if the battery voltage drops 0.3V below the Absorption voltage
restart. When the Absorption timeout occurs, the unit pass to the Float stage supplying a lower
voltage to maintain the battery in a fully charged state. The controller will automatically restart the
full charging cycle if it senses the battery bank is discharged to less than 12.5V/25V in 12V/24V
battery systems respectively.
Note
: The maximum voltage in Bulk stage corresponds to the Absorption one, being the
threshold to pass from Bulk to Absorption stage.
display will show the Bulk symbol other than the ABS one (see the section for more details).
5. Installation Instructions:
Caution: Before installing the unit, please verify the rating of the solar panel, the battery type and
its nominal voltage, and the total power consumption of the DC loads.
Max.
Battery
Current
Voltage
12V or 24V
30A
(Self
detection)
Note
: As per the physical connector of the unit, and/or the crimping terminals being used. However,
thicker wires can be used for the solar panel array to compensate excessive power losses (resistance) on
long runs, by reducing their thickness on the last edge inches (e.g. by splicing two 4" long thinner wires).
That bottleneck would not affect the power losses, being insignificant in 4" long thinner wires and always
thick enough for the unit maximum current rating.
Step 1: Select the Battery type. Refer to the next section ("Understanding the Unit Setting").
Step 2: Connect the positive and negative terminals of the PV, Battery and DC Loads
accordingly. Check their polarity before connecting.
Unit Mounting: Select an appropriate mounting Indoor location not susceptible to extreme
heat, humidity, and dirty conditions. The unit can be oriented in any direction. Allow free space
around the unit for heat dissipation purposes. Install the controller as close as possible to the
battery (the battery acts like a low pass filter, helping the reduction of electrical noises and
interferences on the DC wiring). Hold the controller against the mounting surface and mark the
positions of its mounting holes on its flanges. Then, make the pilot holes with a drill.
(depending on the setting), the unit passes from Bulk to Absorption
Battery
Maximum Solar Panel
Type
Gel, AGM,
Flooded, Lithium
Programmable
960W-24V (24V system)
Page 6 of 21
herever its setting is allowable to the user, the
Rating
480W-12V
(12V system)
,
the timer will
Allowable
Direct
/Min.
wire Gauge
respectively
#6 / #10 AWG
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