Question

A PV string that consists of 5 units of PV modules has been installed on a rooftop of a building. The total cable length from the PV string to the inverter is 20 m. The specification of the PV module is given in Table 2. A 4 mm² of copper cable has been used for the system (resistivity, $\rho$ = 0.017857). i) MS 1837:2018 standard states that the total voltage drop in the PV system shall be less than 3%. Based on this, evaluate the suitability of the selected cable size. Prove your answer. ii) Determine the minimum voltage rating of the string cable. iii) Calculate the actual voltage drop between the string and the inverter. iv) Calculate the actual DC power loss of the cable in percentage. v) Proof that the percentage of power loss is equal to percentage of voltage drop. Table 2: PV module specification Rated power ($P_{mp}$) 150 Wp Open circuit voltage ($V_{oc}$) 43.4 V Peak power voltage ($V_{mp}$) 34 V Short circuit current ($I_{sc}$) 4.8 A Peak power current ($I_{mp}$) 4.4 A [14 Marks] [CO4,PO6,C4]

          A PV string that consists of 5 units of PV modules has been installed on a rooftop of a building. The total cable length from the PV string to the inverter is 20 m. The specification of the PV module is given in Table 2. A 4 mm² of copper cable has been used for the system (resistivity, $\rho$ = 0.017857).
i) MS 1837:2018 standard states that the total voltage drop in the PV system shall be less than 3%. Based on this, evaluate the suitability of the selected cable size. Prove your answer.
ii) Determine the minimum voltage rating of the string cable.
iii) Calculate the actual voltage drop between the string and the inverter.
iv) Calculate the actual DC power loss of the cable in percentage.
v) Proof that the percentage of power loss is equal to percentage of voltage drop.
Table 2: PV module specification
Rated power ($P_{mp}$)  150 Wp
Open circuit voltage ($V_{oc}$) 43.4 V
Peak power voltage ($V_{mp}$) 34 V
Short circuit current ($I_{sc}$) 4.8 A
Peak power current ($I_{mp}$) 4.4 A
[14 Marks]
[CO4,PO6,C4]

A PV string that consists of 5 units of PV modules has been installed on a rooftop of a building. The total cable length from the PV string to the inverter is 20 m. The specification of the PV module is given in Table 2. A 4 mm² of copper cable has been used for the system (resistivity, ρ = 0.017857).
i) MS 1837:2018 standard states that the total voltage drop in the PV system shall be less than 3%. Based on this, evaluate the suitability of the selected cable size. Prove your answer.
ii) Determine the minimum voltage rating of the string cable.
iii) Calculate the actual voltage drop between the string and the inverter.
iv) Calculate the actual DC power loss of the cable in percentage.
v) Proof that the percentage of power loss is equal to percentage of voltage drop.
Table 2: PV module specification
Rated power (Pmp) 150 Wp
Open circuit voltage (Voc) 43.4 V
Peak power voltage (Vmp) 34 V
Short circuit current (Isc) 4.8 A
Peak power current (Imp) 4.4 A
[14 Marks]
[CO4,PO6,C4]

Added by Nicole G.

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