Can I cook in the winter sun?

Yes. The solar oven will cook slower in the winter due to the lower incline of the winter Sun. For the best results place the SunFocus® or the UGLI™ in a spot out of the wind and exposed to full sun. Of course you can also use the electric back up for faster cooking or if starts to snow.

Does it cook as fast as a regular oven?

As a solar oven, the quick answer is, “No. It will take longer.”

However, on days when the UV index is low, solar cooking takes the longest time and on days when the UV index is near max, solar cooking will be the shortest time. Even at it shortest, it may even then take an hour longer than a regular oven would take. However, for the SunFocus® and the UGLI™ 3-in-1 ovens, on the high electric setting, the cooking times can be very similar to your regular oven.

How much do I have to alter recipes to cook solar?

For slow cooking recipes; not all. For high temperature recipes calling for 350 F. and above you will have to adjust your cooking times based on the temperature of the oven for that day’s cooking condition. My rule of thumb is for every 50 degrees below recipe cook for a ½ hour longer than recipe states.