> While the peak operating voltage increases, the amps decrease
I'm hardly an expert, but what i've read it seems with most panels that at -25 C there can be a 25% voltage increase as well as a 25% decrease at 75 C. and while the current does vary with temperture it is much smaller, along the size of 1-2%.
It would seem like i co uld expect a 25% voltage increase (and power) because it is very cold out. But, i'm sure the important temperture is of the silicon and to a lesser extent the ambient outdoor temperture. and, i'm not sure how much warmer the silicon will be once the sun hits it.
>Less AH per day when AH are needed most.
as far as i know the sun is more intense in the winter, ie earth is closer to the sun, less water vapor in the because it is colder, etc. And, the only reason there is fewer ah is because the there is fewer hours of daylight. Which of co urse is why the ah are needed more, the lights are on more.
>Two axis trackers don't gain much over 1 axis at higher latitudes
from what i've read, a two axis tracker gives a about a 10% increase, depending on how often you adjust it. which means it all depends on how much you spend on your panels (and if you like making the adjustments manually) weather it is cost effective or not.