When you want to add items from a previous order to an order you are building, select Order Tracking on the left navigation bar. 1  On the Order History page, select the order number you want to view. The Order Detail page appears. 2  Select the Reorder Items button to add all products on this order to your shopping cart.
Using 4 hours of full sun, gives you this equation: 250 watts x 4 hours. Thatâs 1 kWh (1,000 watts) in a day per 250-watt panel. If you multiply 1kWh per panel by 30 days in a month, youâll find that each 250 watt rated panel will produce about 30 kWh in an average month.
An $18,000 system ($12,600 after the tax credit) that produces 3800 kWh a year in a windy place with 12mph avg. windspeed will produce 76,000 kWh over its 20-year life, for a cost of $0.17 per kWh. That's much more than grid energy, and way more than solar.hen multiply that by the peak output of your panel, then by the number of days per month. For example, for a panel rated at 150 watts in New York, we'd have: 4 hours peak sun x 150 watts panel x 30.5 days per month 1000 kWh/watt-hour = 18.3 kWh/mo.