It depends on the result you want. Note that the last values in your vectors are NaN, so that is going to cause problems in your calculations.
I would instead use:
Pout = Apv*nel*numData1(2:24,6);
hour = (numData1(2:24,4));
Pconsumption = (numData1(2:24,16));
For the integrations, try this:
cintPout = cumtrapz(hour, Pout); % Cumulative Integration
intPout = trapz(hour, Pout); % Complete Integration
cintPconsumption = cumtrapz(hour, Pconsumption); % Cumulative Integration
intPconsumption = trapz(hour, Pconsumption); % Complete Integration
Choose the full integration or the cumulative integration (that you can plot) depending on what you want to do.
