This is my code with solve,
G= 1000;
T=298;
Iscr = 9.71; %short citrcuit current
Vocr = 6; %Open circuit voltage
Im = 9.4; %MPP current
Vm = 5.5; %MPP coltage
K_Isc = 0.0005;
Vth = 0.8629*10^(-4)*T;
Iph= (G/1000) * Iscr* (1-(K_Isc)* (T-298 ));
n = 1;
%Io =x
%Rs = y
%Rsh = z
syms x y z
u = -Iscr + Iph - (x * ((exp((Iscr*y)/(n*Vth)))-1)) - ((Iscr*y)/z)==0;
v = Iph - (x * ((exp((Vocr)/(n*Vth)))-1)) - ((Vocr)/z)==0;
w = -Im + Iph - (x * ((exp((Vm + Im*y)/(n*Vth)))-1)) - ((Vm + (Im*y))/z)==0;
x0 = [10^-8,0.2,2500];
d = solve([u,v,w],[x,y,z],x0);
But I got this error:
>> fsolve18_2
Error using sym.getEqnsVars>checkVariables (line 87)
Second argument must be a vector of symbolic variables.
Error in sym.getEqnsVars (line 54)
checkVariables(vars);
Error in solve>getEqns (line 429)
[eqns, vars] = sym.getEqnsVars(argv{:});
Error in solve (line 226)
[eqns,vars,options] = getEqns(varargin{:});
Error in solve18_2 (line 24)
d = solve([u,v,w],[x,y,z],x0);
