Functional Description
POWERmini USB User Guide 4 2.0
Auto shutdown (over voltage condition)
The battery will be automatically disconnected from the load when the voltage exceeds the High Voltage
Disconnect threshold (HVD). The ability to disable this function is not provided. The output will be
automatically reconnected when the battery voltage falls below the High Voltage Reset threshold.(HVR).
Output Overload
POWERmini USB protects the system from overload by automatically disconnecting the load if excessive
load current is detected. This is indicated by the Power LED flashing RED and an audible warning if the
audible alarm is enabled. The source of overload should be investigated and rectified before using the
system. The following procedure should be used to remedy the fault condition.
1. Disconnect the load from POWERmini USB (both ports) by removing the Powerpole load
connectors at the POWERmini USB end of the cable.
2. Disconnect the battery from the POWERmini USB
3. Reconnect the battery from the POWERmini USB and confirm that the unit powered up normally.
4. Visually inspect the output cables for damaged insulation or strands of wire shorting at either
end of the cable.
5. Check with an ohmmeter for a short circuit between conductors of the output cable.
6. Resolve any issues found in steps 4 and 5 above and reconnect the output cables to the
POWERmini USB.
Audible alarm cancel
If the audible alarm is enabled, you can silence the audible alarm from the Main Menu page by pushing
the SEL button and releasing after about 1 second. The audible alarm will remain disabled until you
manually re-enable it (see Figure 7). The audible alarm is enabled when the asterisk is shown to the right
of the BATTERY label at the top of the Main Menu (see Figure 4).
Solar Control
Solar Charge Controller
The solar charger is a constant current / PWM style of charger which has very low levels of RFI.
The solar input voltage and battery voltages are continuously monitored. The solar panel voltage is
related to the amount of solar radiation on the panel and so when the panel is not fully illuminated it may
not provide enough voltage to charge the battery. If the POWERmini determines that the solar panel is
not sufficient then the solar panel input is disconnected from the battery.
The POWERmini enables charging only when the battery is in the safe area. POWERmini USB tests the
battery to be sure that is above 10V and will not attempt to charge a battery at or below that voltage.
This prevents charging of a possibly defective battery.
If the POWERmini USB determines that the battery voltage has reached the full charge limit, the solar
panel will change to a charge maintenance mode to keep the battery fully charged without overcharging.
The full charge voltage is different between different battery chemistries. The user may adjust the full
charge voltage to suit the battery in use. Both the Low Voltage Disconnect voltage and the Maximum
Charge Voltage can be stored by battery type. This allows you to store values for Lithium ion and Lead
Acid batteries separately. Do not change the Maximum charge voltage from the 14.2 default value unless
you are sure the battery is designed to charge to a higher voltage.
Note that if the POWERmini USB detects a solar panel output greater than 11A the POWERmini solar
input will be automatically disconnected and the warning message “FAULT” will be displayed in the
bottom of the solar panel window. To reset the POWERmini USB solar input, disconnect the solar panel
from POWERmini and then reconnect it.
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