(a) Briefly explain why automotive batteries are not suitable for solar applications. (b) Design a solar PV system to meet the following requirements for a classroom block located in Zambezi, 13º south of the equator, far away from the electric grid. The location receives an average insolation of 4.5kWh/m²/day. It is desired that the system should work without any problems for a period of 2 days during period of overcast. Due to shading over the class room block, the distance from the classroom block to PV panels is likely to be long. 30 Internal light bulbs DC 15W power rating and 4hrs duration of use 2 External light bulbs DC 15W power rating and 12hrs duration of use 1 Small radio DC 20W power rating and 6hrs duration of use 2 Phone chargers DC 1W power rating and 4hrs duration of use 1 Laptop AC 150W power rating and 1hr duration of use 1 Printer AC 800W power rating and 1hrs duration of use 1 Projector AC 1000W power rating and 1hrs duration of use The following components are readily available: 120Wp PV panel, 7.6 amps, 60Wp PV Panel, 4.2 Amps; 100Ah, 50% DoD Battery, 100A charge controller. Determine the following: (i) Number of solar modules required and their inclination angle. (ii) Number of batteries required. (iii) Whether the 100A charge controller rating is sufficient or too large. (iv) Inverter rating.
(a) Briefly explain why automotive batteries are not suitable for solar applications.
(b) Design a solar PV system to meet the following requirements for a classroom block located in Zambezi, 13º south of the equator, far away from the electric grid. The location receives an average insolation of 4.5kWh/m²/day. It is desired that the system should work without any problems for a period of 2 days during period of overcast. Due to shading over the class room block, the distance from the classroom block to PV panels is likely to be long.
30 Internal light bulbs DC 15W power rating and 4hrs duration of use
2 External light bulbs DC 15W power rating and 12hrs duration of use
1 Small radio DC 20W power rating and 6hrs duration of use
2 Phone chargers DC 1W power rating and 4hrs duration of use
1 Laptop AC 150W power rating and 1hr duration of use
1 Printer AC 800W power rating and 1hrs duration of use
1 Projector AC 1000W power rating and 1hrs duration of use
The following components are readily available: 120Wp PV panel, 7.6 amps, 60Wp PV Panel, 4.2 Amps; 100Ah, 50% DoD Battery, 100A charge controller. Determine the following:
(i) Number of solar modules required and their inclination angle.
(ii) Number of batteries required.
(iii) Whether the 100A charge controller rating is sufficient or too large.
(iv) Inverter rating.
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