5 Planning the installation
Planning the connection of the solar modules (DC)
44
5.5.5 Use of string fuses
When connecting one or two module strings to a DC input, no
string fuses are required.
DC 1
DC 2
DC 3
DC 4
DC 5
DC 6
1
2
3
MPPT
(max. 15,7 kW per MPPT)
+
–
+
–
Fig. 5.23: Connection of one or two module strings per MPP
tracker: no string fuses necessary
In principle, string fuses
should
be used when there are three
module strings per DC input.
DC 1
DC 2
DC 3
DC 4
DC 5
DC 6
1
2
3
MPPT
(max. 15,7 kW per MPPT)
+
–
+
–
+
–
Fig. 5.24: Connection of three module strings per MPP tracker:
string fuses necessary
Note that no string fuses are installed in the
inverter. Suitable 15 A and 20 A inline string
fuses are available as accessories from Delta.
These string fuses are integrated into the DC
cable.
Should you require this, please contact Delta
Support by telephone. You can find the contact
information on the last page of this manual.
When selecting protective devices (such as
fuses), always take into account the
maximum
current rating
of the solar modules.
Installation and Operation Manual for Solar Power Inverter M70A EU V2.0 EN 2020-08-03
