In order to design an alternative energy system you'll have to first determine your estimated electrical needs. Use the chart below to estimate the wattage of appliances your not sure of. Knowing how much energy you intend to use is the starting point for any system design. Needless to say, you definitely should use only the most efficient appliances and use them in the most efficient manner in order to keep your initial costs down.
The size (and cost) of any renewable energy system depends on:
1) The amount of power required (in watts).
You can control the first two items!
Go through your average day in your mind and determine what electrical items you use and how many HOURS they will be used on an average. Use the Power Consumption Reference Guide below for estimating wattage requirements for many appliances. For a more accurate estimate, read the label or owners manual for power rating on your appliance or use one of the clamp-on type amp-meters. If an appliance is rated in amps, multiply amps by operating voltage (120 or 240) to find watts.
An Example List for an average day
Please note your actual power consumption useage will vary
|Refrigeration||Refrig 12cf DC||70||18 (avg)||1260|
|Reading||Compact Fluorescent Light||16||3||48|
Watt Hours/Day =
Remember these are estimated averages. Your appliances may differ greatly. Please check your own equipment.
|Appliance Type||Watts/Hour||Appliance Type||Watts/Hour|
|Coffee pot (10 cup)||1200||VCR -Off/Play||10/27|
|Coffee pot (4 cup)||650||CD Player||35|
|Popcorn popper||250||Clock Radio||2|
|Blender||300||AM/FM car tape||8+|
|Waffle iron||1200||CB radio||5|
|Hot plate||1200||Electric clock||3|
|Sink waste disposal||450||Sewing machine||100|
- gas heated
|Garage door opener||350||Ceiling fan||10-50|
|Table fan||10-250||Electric blanket||200|
- 25" color
- 19" color TV or monitor
- 12" b&w
- 100w incandescent
- 25w compact fluor.
- 50w DC incandescent
- 40w DC halogen
- 20w DC compact fluor.
- 40watt equiv.
- 60watt equiv.
- 75watt equiv.
- 100watt equiv.
|Hedge trimmer||450||Weed eater||500|
|1/4" drill||250+||9" disc sander||1200|
|1/2" drill||450+||3" belt sander||625-1000|
|1" drill||800||12" chain saw||1100-2400|
|7 1/4" circ. saw||1200+||14" band saw||1100-1800|
|8 1/4" circ. saw||1800||Typewriter||80-200|
|Air conditioner (energy hogs)
- 20cf (15 hours)
- 16cf (13 hours)
|Sunfrost (figure running 7hrs/day
- 16cf DC
- 12cf DC
|Freezer (figure running
- 14cf ff (15)
- 14cf (14)
Always be sure and check www.energystar.gov for current HVAC and appliance efficiency data.
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