Functional Description
POWERmini USB User Guide 3 2.0
FUNCTIONS
This section provides a description of the many functions that POWERmini USB performs for you.
Battery Settings
The POWERmini USB can be setup to charge Lead Acid or LiFeEPO4 battery types. You can also set it to
work with other battery types by adjusting the maximum charge voltage (see Figure 7). The battery
settings are stored by type so you can quickly switch between two different types of battery.
Output Control
The POWERmini USB controls the output to protect the battery and your radio equipment from out of
range voltages and current.
Low voltage warning
When the battery voltage falls below the preset Low Voltage Limit (see page 13) the Power LED will flash
red periodically. The audible alarm will also sound if it is enabled. The alarm is active as long as the
battery voltage is below this level. The Low Voltage Warning threshold is 0.5V above the Low Voltage
Limit (user setting). For example, if the Low Voltage Limit is set at 11.2V, the Low Voltage Warning Alarm
will activate at 11.7V.
High voltage warning
If the battery voltage exceeds the High Voltage Limit setting the power is automatically disconnected from
the load. An overvoltage warning message is displayed on the front panel and the alarm LED will glow red
continuously. The output load will not be reconnected until the battery voltage falls below the HV reset
limit. For information about changing the settings of both of these limits refer to High Voltage Limit on
page 13
Auto shutdown (under voltage condition)
Auto-Shutdown automatically disconnects the battery from the load when the voltage falls below the Low
Voltage Disconnect threshold (LVD) The Auto-shutdown may be enabled or disabled by the user.
If the Auto-shutdown is enabled, when the battery voltage falls below the LVD, the Shutoff warning is
indicated at the bottom of the Status screen. Both the POWER LED (red to show alarm condition), and the
audible alarm (if enabled) will flash (sound) for a period of approximately 10 seconds. After this warning
period the POWERmini will disable the output and the audible alarm will stop.
The output will be automatically reconnected when the battery voltage rises above the Low Voltage Reset
threshold (LVR). See Threshold Voltages (page 10) for information on how to change this value.
If the Auto-shutdown mode is disabled, the POWERmini will not disconnect the battery and after the
warning period the alarm will cease to sound. The shutdown message will be displayed on the bottom of
the Status page regardless of whether Auto Off is enabled or not.
IMPORTANT: Regardless of whether the auto-shutdown mode is enabled or not, if the battery voltage falls
below 10.1V POWERmini USB will automatically shut down and will not restart until it is reset.
To reset the unit, disconnect and then reconnect the battery from the unit.