Introduction
1–4
975-0400-01-01
Charge Controlling
The XW SCC can regulate PV array current at 12, 24, 36, 48 or 60 volts DC for
charging batteries. It produces up to 3500 watts and 60 amps of charging current
for all battery voltages except 60 volts.
The XW SCC controls how the batteries are charged by the DC source (the PV
array). It can be configured to use a two-stage (“No Float”) or three-stage
charging process to maintain battery voltage at bulk or float levels.
When charging, the XW SCC regulates the battery voltage and the output current
based on the amount of DC power available from the PV array and the state of
charge of the battery.
The XW SCC is able to charge a lower nominal-voltage battery from a higher-
nominal voltage array. For example, the XW SCC can charge a 12-volt battery
from a 36-volt array. This gives flexibility to installers to use longer wiring runs
without compromising efficiency on a higher-voltage array.
The XW SCC is not able to charge a higher-voltage battery from a lower-voltage
array.
Three-Stage Battery Charging
The three-stage charging process results in more efficient charging compared to
on-off relay type or constant voltage solid-state regulators. The final float stage
reduces battery gassing, minimizes electrolyte loss, and ensures complete battery
recharging. Battery voltage and current vary during the three-stage charging
process as shown in Figure 1-4 on page 1–5.
Bulk Stage
During the bulk stage, the XW SCC sets its voltage limit to the bulk voltage
setting. If the batteries are discharged, the XW SCC operates in constant current
mode, delivering its maximum current to the batteries. When the battery voltage
reaches the Float voltage setting, the controller will transition to the absorption
stage.
Figure 1-3
PV Charge Controller
Summary of Contents for XW-MPPT60-150
Page 1: ...XW Solar Charge Controller Owner s Manual XW MPPT60 150 ...
Page 2: ......
Page 3: ...XW Solar Charge Controller Owner s Guide ...
Page 12: ...x ...
Page 86: ...5 4 ...
Page 102: ...B 12 ...
Page 109: ......
