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4. System Function Introduction
The Gemini SC series is a battery charger, a pure sine wave inverter and an AC transfer system in one compact
enclosure. 1. The three-step charging function guarantees that the batteries are always charged 100%
(User-selectable). 2. The pure sine wave inverter assures that the AC output voltage is perfectly reliable even when
limited external AC power is available. 3. External AC power can be supplied by a public grid or a generator. 4. DC
power can be delivered by charged batteries.
4-1. Battery charger introduction
The Gemini SC series can connect many types of battery (default setting is Gel), and user can adjust the
parameters by dip switch to meet battery charging characteristics.
The following table shows some battery type charging setting.
CAUTION
Safety instruction: The setting for traction battery should never be used with a battery bank that
consists of 2V GEL cells.
Battery Type Stage
Bulk Voltage
Absorption Voltage
Float Voltage
Equalization Voltage
Battery Type Stage
Bulk Voltage
Absorption Voltage
Float Voltage
Equalization Voltage
NOTE
Gel batteries are not equalized. Hence, their Equalization Voltages are same as Absorption
Voltages.
Reminder
The default of Equalization function is under "Disable" in the battery types of AGM or
Flooded. Please remember to change from "Disable" to "Enable" if the Equalization
function is required.
WARNING!
When using the Custom setting, the Equalization voltage setting should not allow voltage lower
than the Absorption Voltage setting. Also, the Equalization Voltage setting should not allow a setting
higher than 2-volts (for 12V systems), or 4-volts (for 24V systems) above the Absorb Voltage
setting.
28
GEL (Default)
@12VDC
14.4VDC
14.1VDC
13.6VDC
NOTE!
Table 14
AGM
@12VDC
14.7VDC
14.3VDC
13.1VDC
15.5VDC
User can be setting the custom function voltage, but must use CR-20C remote control or RS-232.
Table 15
@24VDC
@12VDC
28.8VDC
14.7VDC
28.2VDC
14.6VDC
27.2VDC
13.4VDC
NOTE!
15.5VDC
：
Battery type charging setting I
@12VDC
@24VDC
Default
Range
29.4VDC
14.7
28.6VDC
14.5
26.2VDC
13.5
31VDC
15.5
：
Battery type charging setting II
Flooded
@24VDC
29.4VDC
29.2VDC
26.8VDC
31VDC
Customer *
@24VDC
Default
Range
29.4
29
12-16
24-32
VDC
27
VDC
31
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