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