Civil Engineering Reference
In-Depth Information
Table 5 Technical character-
istics of
Technical characteristics
Values from product
data sheet
the
solar
charge
controller
Nominal battery voltage
48 Vdc
Maximum PV array voltage operating
140 Vdc
Maximum PV array open circuit voltage
150 Vdc
Array short circuit current
60 Adc
According to the battery voltage Vcc, its selection involves choosing:
input voltage in solar charge controller (Vsc) higher than the maximum voltage
of the PV panel so, Vsc > Vcc;
input power in solar charge controller (Psc) higher than the maximum power of
the PV panel so, Psc > P
PVP
;
Maximum charging current to the batteries.
D. Cogeneration unit
The electric power of the CHP unit is obtained from the relation:
A
TFA
e
max
P
CHP
¼
½
ð
Þ
kW
14
N
days
t
oper
where:
A
TFA
floor area of residence (m
2
);
total
e
CHPmax
value of speci
c energy in the month with the biggest load of the CHP
unit (kWh/m
2
);
N
days
number of days of in the month;
t
oper
daily time of operation [h] (6
8 h on average in correlation with
estimated time for battery recharging Table 17 in Chap.
-
“
”
).
After that is chosen from the market, a CHP unit with nominal power P
CHP
n
satis
es the relation:
P
CHP
n
P
CHP
ð
15
Þ
E. Inverters
To connect the photovoltaic system to the electric grid or domestic appliances,
we will need an additional equipment called inverter to condition the electricity and
safely transmit the electricity to the load that will use it. Most electrical appliances
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