SIEMENS
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Siemens KT 10.1 · 2016
11
SITOP DC UPS uninterruptible power supplies
DC UPS with battery modules
SITOP UPS1600 DC UPS modules
■
Technical specifications
The table shows the maximum buffering times for the SITOP
UPS1100 battery modules for different load currents:
The SITOP Selection Tool offers detailed selection guidance
according to criteria such as the required backup time, load
current, peak current and battery connection threshold:
Important information for selecting the battery capacity:
Determination of the mains buffering times is based on the dis-
charge period of new or non-aged, completely charged battery
modules at a battery temperature not below +25 °C to the shut-
down of the DC UPS.
Battery aging
reduces the still available battery capacity up until
the end of the service life to typically around 50% of the original
capacity value when new (1.2 Ah/3.2 Ah/7 Ah, etc.) and the in-
ternal resistance increases. When the message "Battery charge
> 85%" appears, only around 50% x 85% = approx. 43% of the
originally available capacity can be assumed at the end of the
battery service life.
At battery temperatures below +25 °C, the available capacity
drops approximately by another 30% at +5 °C battery tempera-
ture, to approximately 70% of the approximately remaining 43%.
There is then only around 30% of the original capacity available.
A significantly larger battery capacity must therefore be selected
when configuring the plant: A drop to approx. 50% is compen-
sated for by selecting 1 / approx. 0.5 = approx. double the
battery capacity (required as per the table for the relevant load
current and the relevant buffering time). Available capacity of
approx. 43% is compensated for by selecting 1 / approx.
0.43 = approx. 2.33 times the battery capacity. Available capac-
ity of approx. 30% is compensated for by selecting 1 / approx.
0.3 = approx. 3.33 times the battery capacity.
Recommendation:
Instead of installing double the battery capacity, regular battery
replacement halfway through the expected service life (reduc-
tion of capacity to approx. 50%) can be more advisable for the
following reasons: Capacity does not drop below 100% until the
halfway point of the expected battery life (or slightly beyond).
With regular replacement after this point, only the single battery
capacity (instead of double capacity) must be installed due to
aging (-> neutral in price with regard to battery module costs,
but only requires half the space).
Replacing the battery after half its service life dispenses above
all with the large scatter range of the residual capacity at the end
of the service life, which is not accurately defined by battery
manufacturers (after the full time, many batteries are above, but
many are also below the average 50% residual capacity, that is
to say, even if double the capacity is installed, the influence of
aging at the end of service life is not reliably compensated for,
rather only typically) -> When replacing after half the expected
service life, the configured buffering time is maintained with
considerably greater reliability.
In the case of batteries stored in cool conditions (not above
+25 °C) and for not longer than approximately 4 months, the
following service life can be assumed, strongly dependent on
battery temperature:
In normal cases (installation in the coolest location in the control
cabinet at approx. +30 °C), the battery should be replaced with
single installed battery capacity in accordance with the selection
table after 1 year of operation!
After a power failure, the battery module is disconnected from
the loads at the end of the selected buffering time either auto-
matically or electronically by opening the On/Off control circuit,
and as soon as the 24 V input voltage is available again, it is
quickly re-charged with the charge current of the relevant DC
UPS module (with I-U charge characteristic: First constant
current I for fast charging, and changeover to constant voltage
U to maintain the charge when the battery is almost full).
Product brand
name
SITOP UPS1100
SITOP UPS1100
SITOP UPS1100
SITOP UPS1100
SITOP UPS1100
SITOP UPS1100
Type of power
supply
24 V/1.2 Ah
24 V/2.5 Ah
high temperature
24 V/3.2 Ah
24 V/5 Ah LiFePo
24 V/7 Ah
24 V/12 Ah
Article No.
6EP4131-0GB00-0AY0
6EP4132-GB00-0AY0
6EP4133-0GB00-0AY0
6EP4133-0JB00-0AY0
6EP4134-0GB00-0AY0
6EP4135-0GB00-0AY0
Load current
Buffer times
1 A
34 min
1.7 h
2.5 h
5.2 h
5.4 h
10.3 h
2 A
15 min
54.6 min
1 h
2.5 h
2.6 h
4.8 h
3 A
9 min
32.9 min
39 min
1.7 h
1.6 h
3 h
4 A
6 min
20.6 min
27 min
1.25 h
1.2 h
2.3 h
6 A
3.5 min
14.3 min
17.5 min
50.6 min
41 min
1.4 h
8 A
2 min
10.5 min
12 min
37.8 min
28 min
1 h
10 A
1 min
7.2 min
9 min
30.2 min
22 min
48.6 min
12 A
-
6 min
7 min
25.1 min
17 min
40.3 min
14 A
-
4.5 min
5 min
21.6 min
15 min
33.6 min
16 A
-
4.1 min
4 min
18.8 min
12.5 min
26 min
20 A
-
2.9 min
1 min
12.9 min
9.1 min
19.6 min
30 A
-
-
-
-
4.6 min
12.1 min
40 A
-
-
-
-
2.8 min
8.5 min
Battery
temperature
Drop to approx.
50% of residual
capacity
Recommenda-
tion: Replace
(at 100% of
residual
capacity) all
Alternative
recommendation
+20 °C
4 years
2 years
+30 °C
2 years
1 year
+40 °C
1 year
0.5 years
Install double
capacity and
replace
(1 x per year)
© Siemens AG 2016