I'm plotting solar pv Power/Voltage and I/V and the plot does not connect both axis. I can't find the problem

I want find the voltage and current at Maximum Power Point

Io = 0.1*10^-9;

IL = 9.5;

V = linspace(0,0.62,100);

q = 1.6*10^(-19);

k = 1.380649*10^(-23);

% Temperature at 35°C and Irradiance of 650 W/m^2

T = 273.15+35;

G =900;

Gr = 650;

I = (IL*(G./Gr))-(Io.*(exp((q.*V)./(k.*T))-1));

n = 72;

Pp = n.*(V.*I);

Vp = V.*n;

figure(8)

plot(Vp,Pp,'r','linewidth',3);

xlabel('Voltage (V)');

ylabel('Power (W)');

title('PV Panel Power and Voltage Curve at 35°C')

grid on

axis([0,50,0,600])

ANY HELP WOULD BE GREATLY APPRECIATED

[Dyuman Joshi]

What do you mean by "the plot doesn't connect both axis"?

[Arif Hoq]

If you use 0.69 in the linspace you can get the figure.

Io = 0.1*10^-9;
IL = 9.5;
V = linspace(0,0.69,100);
q = 1.6*10^(-19);
k = 1.380649*10^(-23);
% Temperature at 35°C and Irradiance of 650 W/m^2
T = 273.15+35;
G =900;
Gr = 650;
I = (IL*(G./Gr))-(Io.*(exp((q.*V)./(k.*T))-1));
n = 72;
Pp = n.*(V.*I);
Vp = V.*n;
figure(8)
plot(Vp,Pp,'r','linewidth',3);
xlabel('Voltage (V)');
ylabel('Power (W)');
title('PV Panel Power and Voltage Curve at 35°C')
grid on
axis([0,100,0,600])

Is that it ?

[MUHAMED SIDIBEH]

Yes that's what I mean. Thank you very much

Answer 1

[Arif Hoq]

If you use 0.69 in the linspace you can get the figure.

Io = 0.1*10^-9;
IL = 9.5;
V = linspace(0,0.69,100);
q = 1.6*10^(-19);
k = 1.380649*10^(-23);
% Temperature at 35°C and Irradiance of 650 W/m^2
T = 273.15+35;
G =900;
Gr = 650;
I = (IL*(G./Gr))-(Io.*(exp((q.*V)./(k.*T))-1));
n = 72;
Pp = n.*(V.*I);
Vp = V.*n;
figure(8)
plot(Vp,Pp,'r','linewidth',3);
xlabel('Voltage (V)');
ylabel('Power (W)');
title('PV Panel Power and Voltage Curve at 35°C')
grid on
axis([0,100,0,600])