15
4. System Function Introduction
The LSC12-2000 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 LSC12-2000 can connect to three types of batteries (default setting is Flooded), and user can
adjust the parameters by dip switch to meet battery charging characteristics.
The following table shows some battery type charging setting.
Battery Type Stage
LiFePO4
AGM
Flooded
@12VDC
@12VDC
@12VDC
Bulk Voltage
14.4VDC
14.4VDC
14.2VDC
Absorption Voltage
14.4VDC
14.3VDC
14.1VDC
Float Voltage
14.0VDC
13.6VDC
13.2VDC
Table 14
：
Battery type charging setting I
4-1-1. Battery charging function description
The LSC12-2000 is equipped with a PFC (Power Factor Corrected) and PI (Proportional-Integral)
multistage battery charger. The PFC feature controls the amount of power used to charge the batteries
to obtain a power factor as close as possible to 1 (or unity). This causes the battery charger to look like
a resistor to the line (forces the charge current wave shape to mirror the voltage wave shape). The PI
feature allows the charger voltage and current to change independently. These two features maximize
the real power available from the AC power source (i.e., utility or generator), which translates into less
power wasted and greater charging capabilities than most chargers today. When an AC source is
connected to the AC input, the inverter begins monitoring for acceptable AC voltage. Once the AC
voltage is accepted, the AC transfer relay closes the charge mode begins. After the charge mode
begins, the inverter’s battery voltage is monitored to determine the charging stage. The charger will
skip the Bulk and Absorb charge stages and go directly to Final charging. However, if the incoming AC
power is lost and returns within 2 minutes the charge mode returns to the charge stage it was in prior to
losing AC input—regardless of the battery voltage.
The LSC12-2000 three stages include an automatic 3-stage charging process: Bulk, Absorb, and Float
Charge. The automatic 3-stage charge process provides complete recharging and monitoring of the
batteries without damage due to overcharging. If the AC input voltage falls below 90 VAC the charger
will stop charging to help stabilize the incoming AC voltage. The Charge mode provides up to three
separate charging stages: Bulk Charging, Absorb charging and Float Charge.
Fig. 9
：
Three step charge system
