The main objective of a physical map is to show landforms, bodies of water and other geographical features. Features shown include mountains, deserts and lowlands as well as lakes, rivers and oceans.
Depending on your electricity prices, a 400 watt HID will cost $200 â $400 each year of use, plus the cost of replacement bulbs. LEDs meant to replace 400w HIDs average around 180 watts.
Our annual electrical usage each year is a miserly 4,800 kilowatt-hours, of which 75 percent is produced by the solar-electric array. The average cost across the country for a professionally installed system is about $8 to $9 per watt, with batteries adding an additional 20 to 30 percent to the cost.If you are a handy do-it-yourselfer, you can save around $2 per watt, but your system may be more difficult to certify for incentives.ur annual electrical usage each year is a miserly 4,800 kilowatt-hours, of which 75 percent is produced by the solar-electric array. The average cost across the country for a professionally installed system is about $8 to $9 per watt, with batteries adding an additional 20 to 30 percent to the cost.