32 S5 Battery Validation System
7
Make sure
impedance readings
are consistent within
each battery string.
Take three readings
for the second unit in
each string, and three
for the next-to-last
unit in each string.
See whether there is
more than a 10
percent variation in
the impedance
readings.
a. From the Communications window, click the
Diagnostic button.
b. In the Diagnostics Measurement window, take
three readings: Write down their values in the
empty Unit Impedance Readings tables on the
next page.
i. Under Unit, select 1 in the String drop down
menu, and 2 in the Unit drop down menu.
Click Unit Impedance. Write the value in the
box for “Reading 1,” “Unit 2.”
ii. Under Unit, select 1 in the String drop-down
menu, and the next-to-highest value
available in the Unit drop down menu. Click
the Unit Impedance button. Write down the
value in the box for “Reading 1,” “Next-to-
last unit in string.”
iii. Repeat steps i and ii, but write the values in
the Reading 2 row.
iv. Repeat steps i and ii, but write the values in
the Reading 3 row.
v. Repeat steps i through iv for every string in
your battery system.
c. For each column of readings, subtract the
lowest value from the highest value. Take the
result and divide this by the average value. If the
result is 0.10 or more, call BTECH Tech Support.
Example (from next page):
Highest reading in Unit 2 column: 3.07
Lowest reading in Unit 2 column: - 3.06
Difference . 01
Average reading = (3.07+3.06+3.06) /3 = 3.063
Difference divided by average reading = .
01 / 3.063 =0.0033
This indicates very stable impedance readings.
d. Click Close when done.
Action How to do it Picture
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