PVI 50/60 TL Installation and Operation Manual (Rev C)
DOCR-070645-E
Page 34 of 102
The PVI 50/60TL inverters are equipped with standard 15A DC fuses. Customers must
verify that the appropriate fuses are installed depending on the PV system design.
(a) Each independent PV DC input string needs fuse protection.
(b) The rated voltage of fuses should be 1000V
(c) The rated current of fuses is generally 1.56 × short circuit current from the PV
strings, rounded up to the next available fuse size.
The following table lists the fuse type, specifications and number under the rated
voltage and power range of 10 strings of PV panels.
Table 2.7 - DC Fuse Selection
NOTE 1:
The 1000VDC Littelfuse fuse series is recommended. Detailed information
is available at:
http://www.littelfuse.com/
.
NOTE 2:
The fuse holders can also accept a 20A (SPF020), 25A (SPF025) and a 30A
(SPF030) fuse for combined input strings if needed.
NOTE 3:
Two 30A fuses should not be used next to each other.
NOTE 4:
If string fuses other than the provided 15A fuses are desired, it is the
customers’ responsibility to source and install these extra fuses.
WARNING:
Use of different fuses or wrongly sized fuses can cause damage to
equipment or create un-safe working conditions. Any damage resulting
from incompatible fuses is not covered by warranty.
3) DC Conductors Connections
To ensure the optimum performance of the inverter, please read the following
guidelines before making DC connections:
(a) Confirm the DC configuration referring to Table 2.6 and ensure that the
maximum open circuit voltage of the PV modules is lower than 1000 VDC
under any conditions.
(b) Confirm that the PV strings for each MPPT of the inverter are of the same
module type, power level and string length before connection. The number,
orientation, and tilt of PV strings may differ for different applications.
(c) Configure the external wiring according to the conditions in Table 2.8.
50-60 kW
Brand
Standard fuses
(15A)
20A
25A
30A
Littelfuse
SPF015
SPF020
SPF025
SPF030
15A/1000V
20A/1000V
25A/1000V 30A/1000V
