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The sizing of the string fuses must be made taking into account the 2
following conditions:
1. The nominal current of the fuse (I
rating of the fuse to be used in series on the strings (maximum series fuse
rating), indicated in the technical data of the PV modules in compliance
with standard EC 61730-2:
2. The fuse rating (I
and on the sizing guidelines provided by the manufacturer to avoid
untimely tripping. As a general guideline, based on the photovoltaic
modules' short circuit current (I
the fuse with the following formula:
Fuses must be chosen among the standard commercially available
ratings, selecting the value that is closest to the obtained result.
The fuse selected with the calculation described previously takes into
consideration derating factors and corrections such as:
- increase in the effective irradiation of the installation area
- Increase in the Isc on the basis of the high temperature of the PV
module
- Thermal derating of the fuse
- Maximum return current of the PV modules installed
ABB can supply fuse kits of different values
Code
KIT 24 FUSES 12A
KIT 24 FUSES 15A
KIT 24 FUSES 20A
KIT 24 FUSES 30A
For effective calculation taking real installation conditions into account, refer to the documents
supplied by the protection fuse manufacturer.
) must not exceed the maximum
rated
I
< Maximum series fuse rating
rated
) must be determined based on the string current
rated
), it is possible to calculate the rating of
sc
I
> (1.4 ≈ 1.5)*I
rated
Description
Kit of 12A fuses
Kit of 15A fuses
Kit of 20A fuses
Kit of 30A fuses
- 84 -
5 - Installation
sc
Quantity
24
24
24
24
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