background image

REFERENCE 

POWERmini USB User Guide 2.1.0A 

11 

350-00103-5 

TECHNICAL REFERENCE 

Battery Types 

For best results you should be sure to set the charge and cut-off parameters to suit the battery chemistry 
that you are going to use.  POWERmini allows you to save settings for the maximum and minimum battery 
voltages separately for different types of batteries. 

Different types of battery chemistry have different voltage vs capacity characteristics.  The characteristic 
Capacity (Ah) vs voltage curves of three popular battery types are shown in  Figure 11 below. 

 

Figure 11 Comparison of battery characteristics for different battery chemistry 

The three types of batteries shown in the chart above are Lithium Iron Phosphate (4 cell), Lead Acid (6 
cell) and Lithium Polymer (3 cell).  Notice that the curves are similar in shape but have very different 
values for the fully charged and depleted states.   

 

Lithium Iron Phosphate battery  
The LiFePO4 battery a higher maximum voltage (100% charge level) and a relatively flat discharge 
curve. These batteries can also provide very high output currents relative to their Ah rating. 

 

Lead Acid battery 
The battery a lower maximum voltage, a steeper discharge curve and a lower cut-off voltage. 

 

The Lithium Polymer 
This is popular in car jump start battery packs and cell phones because it has a higher per-cell 
voltage. The 12V jump start version uses only 3 cells, resulting in a battery that has an even lower 
maximum voltage and a lower cut-off voltage than Lead Acid batteries  
Also, beware - the surprisingly low capacity of the battery shown in the orange curve above is 
because the 7Ah manufacturers rating applies only to the battery USB charge port not the 12V 
battery output.  

Although some QRP radios work well with this battery type, the low nominal terminal voltage of this 
battery is problematic for other radios, many of which require a battery voltage of over 12V to function 
normally.  

9

10

11

12

13

14

0

2

4

6

8

Ba

tt

e

ry

 V

ol

ta

ge

 (

V

)

Ah

Battery Comparison (Ah vs Battery Voltage)

Lithium Iron Phosphate
7.5Ah

Lead Acid 7Ah

Lithium Polymer (3 cell)
'7Ah'

Содержание PowerMini USB

Страница 1: ...ted device incorporates the functions of a solar charge controller battery management system power monitoring device and power distribution in a small robust and weather resistant package Despite its...

Страница 2: ...WER SYSTEM MONITORING 6 Status Page 6 System Report 7 OTHER FUNCTIONS 8 Display Timeout 8 Auto Shutdown under voltage condition 8 Auto Shutdown over voltage condition 8 Output Overload 8 Audible Alarm...

Страница 3: ...e USB charger output The DC power outputs are on the right side of the unit All power connections use the popular Anderson Powerpole family of low voltage high current connectors which are popular in...

Страница 4: ...should be connected to the negative connection of the radio Before connecting to the radio confirm the connections are correct using a DC voltmeter DMM Press the SEL button briefly twice to view the B...

Страница 5: ...e with different types of battery User settings include Low battery voltage trip point reset point and early warning of low battery Automatic disconnect provides protection from deep discharge Max cha...

Страница 6: ...s to change the value Figure 5 Edit Threshold Voltage Edit page Edit box Each press of the SEL button moves the box to the next entry Moving to the next line To skip to another line briefly press the...

Страница 7: ...oltage settings control the point at which POWERmini USB will disconnect or reconnect the battery and the load Figure 7 Control Settings page Auto off Enable Disable Select whether auto shutdown is en...

Страница 8: ...p and bottom of the voltage bar Battery voltage Load current Figure 8 Left side of Status page Low voltage limit High voltage limit The lower edge of the box indicates the high voltage disconnect HVD...

Страница 9: ...ls Figure 10 System Report page Power Up Time The operating time since the unit was powered on Solar Power The instantaneous solar panel power output Solar Peak The maximum output of the solar panel s...

Страница 10: ...hether 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 by disconnecting and then rec...

Страница 11: ...Rmini 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 solar input disconnect the solar pan...

Страница 12: ...ltage reset 15 V Restore Factory Defaults Use the following procedure to reset the unit back to the default factory settings Disconnect the POWERmini USB from the battery and solar input Press and hol...

Страница 13: ...higher maximum voltage 100 charge level and a relatively flat discharge curve These batteries can also provide very high output currents relative to their Ah rating Lead Acid battery The battery a lo...

Страница 14: ...not charge a 12V battery if the total battery voltage is below 10V If you have a battery that has an abnormally low terminal voltage then you may be able to recover it by using a very low charge curr...

Страница 15: ...isconnect range 14 16 V user adjustable Low voltage disconnect range 9 5 13 V user adjustable Maximum Charge Voltage 10 15 V user adjustable Audible alarm User settable enable disable Overall Size 4 5...

Отзывы: