- #1
solar_car
- 2
- 0
hello,
our team has a solar car project, and i am in charge of the solar array system. Now we have an average silicon solar cell of Voc 0.6 V and Isc 6 A, thus 3.5 W of power. We are given 6 sq. meter of area to cover with solar cells. This corresponds to around 2300 standard sized solar cells. We want to have a module of 36 cells and 2 bypass diode; this corresponds to Voc of 21.6 V, Isc of 6 A, and power of around 130 W. Our battery system has a minimum of 72 V, maximum of 126 V, and nominal of 100 V. So, we want each panels to have a minimum Voc of 150 V. This corresponds to around 7 module per panel. If we chain all modules in series we will have per module; Voc of 150V, Isc of 6 A, and power of 900 W. Our MPPT has variable input and output voltage ranges but is restricted to a minimum of 9 A input current.
Problem 1 > Given a module Voc of 21.6 V and Isc of 6 A, is there any kind of parallel and series module configuration to get Voc of 150 V and Isc of 9 A per panel.
My assumption and problem > Parallel configuration of 2 modules will output 12 A, we use a current divided circuit (w\ resistors) to reduce the 12 A to 9 A (max MPPT input current). But, say, if the parallel modules had total current output of 9 A together, we don't want to lose this current to the resistor. I have read in many articles of solar car teams using series and parallel module configuration to get desired Voc and Isc. It seems to me to be impossible arrange the module i have stated in parallel configuration while limiting the current to 9 A.
our team has a solar car project, and i am in charge of the solar array system. Now we have an average silicon solar cell of Voc 0.6 V and Isc 6 A, thus 3.5 W of power. We are given 6 sq. meter of area to cover with solar cells. This corresponds to around 2300 standard sized solar cells. We want to have a module of 36 cells and 2 bypass diode; this corresponds to Voc of 21.6 V, Isc of 6 A, and power of around 130 W. Our battery system has a minimum of 72 V, maximum of 126 V, and nominal of 100 V. So, we want each panels to have a minimum Voc of 150 V. This corresponds to around 7 module per panel. If we chain all modules in series we will have per module; Voc of 150V, Isc of 6 A, and power of 900 W. Our MPPT has variable input and output voltage ranges but is restricted to a minimum of 9 A input current.
Problem 1 > Given a module Voc of 21.6 V and Isc of 6 A, is there any kind of parallel and series module configuration to get Voc of 150 V and Isc of 9 A per panel.
My assumption and problem > Parallel configuration of 2 modules will output 12 A, we use a current divided circuit (w\ resistors) to reduce the 12 A to 9 A (max MPPT input current). But, say, if the parallel modules had total current output of 9 A together, we don't want to lose this current to the resistor. I have read in many articles of solar car teams using series and parallel module configuration to get desired Voc and Isc. It seems to me to be impossible arrange the module i have stated in parallel configuration while limiting the current to 9 A.