75
017-220-J0 Rev C
10.4 Using the Spreadsheet
Download the spreadsheet “Peukert’s Parameters Calculator.xls” from www.alpha.ca website.
To determine Battery Peukert's Number and
Battery Capacity
This spreadsheet assists in determining the Peukert's parameter for a battery string
and load. This data will be used by the FXM firmware to estimate the battery run time
remaining in back up mode (Inverter mode).
From the current discharge table (see table below) enter the two current discharge values
(I
1
and I
2
) closest to the calculated battery string current value and look up the two discharge
hours (R
1
and R
2
).
Peukert's Number = n
1.145
Battery Bank Capacity
(battery strings in parallel) =
16.520
Enter battery string voltage
Enter nominal load on inverter
Enter number of parallel battery strings
Enter battery capacity at 20 hour rate
Calculated nominal current per battery string
24
80
2
8.26
2.19
VDC
Watts
AH
ADC
Discharge Current (I
1
)
Rating 1 (R
1
)
Discharge Current (I
2
)
Rating 2 (R
2
)
2.34
3
1.82
4
A
Hrs
A
Hrs
Constant Current Nominal Ratings in Amps (@ 25° / 77° F)
Discharge Time
2min
4min
5min
6min
8min
10min
15min
20min
30min
45min
60min
90min
2hr
3hr
4hr
5hr
1.60V:
74
50
42.2
36.8
29.6
24.9
18
14.2
10.3
7.36
5.84
4.21
3.31
2.37
1.84
1.51
1.67V:
67.3
47.5
40.7
35.8
29
24.5
17.8
14.1
10.2
7.34
5.82
4.2
3.31
2.36
1.83
1.5
1.70V:
64.1
45.9
39.7
35.2
28.6
24.2
17.7
14.1
10.1
7.33
5.81
4.2
3.3
2.36
1.83
1.5
1.75V:
58.3
42.8
37.5
33.6
27.6
23.5
17.4
13.9
10
7.27
5.77
4.17
3.28
2.34
1.82
1.49
Summary of Contents for Alpha Micro 100
Page 1: ...Alpha Micro 100 UPS Technical Guide 017 220 J0 Effective 09 2020...
Page 2: ......
Page 36: ...35 017 220 J0 Rev C Figure 14 Web Interface Bulk Charging Menus...
Page 37: ...017 220 J0 Rev C 36 Figure 15 Web Interface Bulk Charging Menus...
Page 85: ......
Page 86: ......
Page 87: ......
