mppt vs pwm

I doubt at this point it is necessary with the explanation given BUT if you want more test...it's below freezing and sunny here. I planned on testing my little solar oven anyways and can drop a panel on the driveway while I'm at it. Voc, Vmp, battery voltage I can do but please no Isc. At these temps all I'll be able to tell you is that they are over 10a as I hear the pop and my meter dies. lol