
30-6 Power Electronics and Motor Drives
30.3 Balance of System
A complete PV system includes the PV devices, namely cells, modules, arrays, and so on, that convert
s
unlight
i
nto
d
irect-current
(
DC)
e
lectricity.
S
uch
e
nergy
i
s
t
ransferred
to
t
he
l
oad
o
r
to
t
he
e
lectrical
g
rid
b
y
m
eans
o
f
a
s
ubsystem
t
hat
i
s
g
enerally
r
eferred
to
a
s
t
he
“
balance
o
f
s
ystem”
o
r
B
OS.
I
t
e
ncom-
passes all components of a PV system other than the PV panels and includes the following:
•
St
ructures for mounting the PV arrays or modules.
•
e
p
ower-conditioning
e
quipment
t
hat
a
djusts
a
nd
c
onverts
t
he
D
C
e
lectricity
to
t
he
p
roper
f
orm and magnitude required by an AC load ...