Questions About My Solar Home System School Project
Maximum power is not the product of open circuit voltage and short-circuit current but when the impedance is matched and this is generally around 75% of that so instead you should use a three watt load but not a tungsten bulb as this starts as a 30W load.

You need optimum solar input to get max power and the MPT voltage starts at ~ 82% of Voc then drops with solar input to ~72%. 

Depending on Panel characteristics, your results will vary.