The output power will be much less if it is not working in a full sun shining. If your latitude is less than 40, you will be able to get "full sun shining" in noon in summer. In all other conditions, the output power will loose, about 1/2 or 1/4 of peak output. Panels must face the sun, and about 45 degrees to get maximum power.
(For USA and most EU contries facing south and for AU facing north). Working temperature should be limited to less than 65 centigrade. To measure the panels, you need a 500W Metal Halide Lamp and test with 8-10 inches.An 200W Incandescent Lamp and test in 2-3 inches, you will get a power similar to 1000W/sq meter. We promise our panels can output never less than 80% of guaranteed power and most will be more than marked value. Always be informed that the output power might not reach the rated power if the direction is incorrect and in seasons other than summer. The item "2V 5V 6V 9V Solar Panel Power Cell For Charger" is in sale since Wednesday, November 25, 2015. This item is in the category "Home & Garden\Home Improvement\Electrical & Solar\Alternative & Solar Energy\Solar Panels". The seller is "sure-display" and is located in shenzhen. This item can be shipped worldwide.