26
Figure 3-19 Location of the PV connection mode selector switch
Selector switch for
PV connection
mode
1-----independent mode
2-----parallel mode
2) DC fuse selection
CPS SCA23/28KTL-DO inverters can be equipped with typical 12A (23kW
Inverter) and 15A (28kW Inverter) DC fuses. Customers must verify that the
appropriate fuses are used depending on the actual configuration PV strings.
1
）
Each independent string of DC input from the PV strings needs fuse
protection.
2
）
The rated voltage of fuse should be higher than the Max. Voc of each
PV string.
3
）
In order to keep the output power normal, the rated current of fuse is
generally larger than the 1.5 × Max. output current from the PV strings.
4
）
In order to protect the PV strings, the rated current of fuse should NOT
be larger than the sum of the Isc of any two of the PV strings. Make
sure the rated current of fuse is as small as possible on the condition
of normal output power.
The following table lists the recommended fuse type, specifications and
number under the rated voltage and power range of 8 strings of PV panels.
Table 3-5 Recommended fuses
Brand
Type
Rated
current
Rated
voltage
Number
SCA23KTL-DO
Littelfuse
0SPF012.T
12A
1000V
16
SCA28KTL-DO
Littelfuse
0SPF015.T
15A
1000V
16
