PV Protection
INTRODUCTION
CH 10 gPV Fuse Selection
Define panel data:
• I
SC
(string)
• U
OC
(STC) -
NO
Does string number
exceed 2?
open circuit voltage
at standard conditions
No gPV string
fusing required
• Number of panels
• Number of strings
YES
gPV string fuse
≥ 1.4 xl
SC
(panel)
gPV string fuse Un ≥ 1.2 x U
OC
(STC)
(panel) x number of panels
Derating factor 1.4 is defined for ambient temperature
maximum 45°C . Cable cross-section derating factor
is not included!
Apply gPV string
fuse to + string
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