IEEE 485:2010 pdf free download

IEEE 485:2010 pdf free download.IEEE Recommended Practice for Sizing Lead-Acid Batteries for Stationary Applications.
d) Calculate and record the times from the start of each period to the end of the section as indicated in column (5).
e) Record in column (6) the capacity factors (R, or K,, from the manufacturer’s literature) for each discharge time calculated in column (5).
f) Calculate and record the cell size for each period as indicated in column (7). Note the separate subcolumns for positive and negative values.
g) Calculate and record in column (7) the subtotals and totals for each section as indicated.
h) Record the maximum section size (the largest total from column (7) on line (8), the random section size on line (9), and the uncorrected size on lines (10) and (11).
i) Select the correction factor from Table I or from the manufacturer’s published data for the temperature shown in the main heading and record it on line (12).
j) Enter the design margin on line (13) and the aging factor on line (14). Combine lines (II), (12), (13), and (14) as indicated and record the result on line (15).
k) When line (15) is in terms of ampere-hours and does not match the capacity of a commercially available cell, the next larger cell is required. When line (15) shows a fractional number of positive plates, use the next larger integer. Show the result on line (16).
l) From the value on line (16), 6.3.5, and the manufacturer’s literature, determine the commercial designation of the required cell and record it on line (17).
7. Cell voltage/time profile calculation
The battery sizing procedure and methods described above should be used so that, for the specified battery duty cycle and the cell size selected, the average cell voltage will not drop below the specified minimum (e.g., 1.75 V or 1.81 V) at any point in the duty cycle. It is therefore not normally necessary to calculate the cell or battery terminal voltage because it will be above the predetermined allowable minimum through the discharge period. If the need for such information should arise, Annex C describes one method of calculating the voltage at various points in the battery duty cycle utilizing the typical discharge characteristic curves published by the battery manufacturer.