|
Sun Energy Systems
Consultants for Free Energy
5138 Wurzbach
San Antonio, TX 78238
(210) 681-9375
Below is an example of how power usage is calculated to determine solar system specifications
Three Bedroom/Two Bath Solar Energy Needs
Standard Version
|
| Room |
Watts |
Fixture/Appliance |
Quantity |
Hours |
Watt-Hours Used |
| Bedrooms |
6 |
12 V Bed Lights (F6T5) |
3 |
0.5 |
9 |
| |
7 |
12 V Dresser Lights (PL7) |
3 |
0.5 |
10.5 |
| |
6 |
12 V Closet Lights (F6T5) |
3 |
neg |
- |
| Bathrooms |
6 |
12 V Lights (F6T5) |
2 |
1 |
12 |
| Hall |
6 |
12 V Lights (F6T5) |
1 |
neg |
- |
| Kitchen |
6 |
12 V Sink Light (F6T5) |
1 |
1 |
6 |
| |
6 |
12 V Stove Light (F6T5) |
1 |
1 |
6 |
| |
6 |
12 V Table Light (F6T5) |
1 |
1 |
6 |
| |
|
10 Cu. Ft. Refrigerator |
1 |
*30% |
Run time/day |
| Living |
7 |
12 V Lights (PL7) |
2 |
2 |
28 |
| |
25 |
Television (DC) |
1 |
2 |
50 |
| |
25 |
Stereo (DC) |
1 |
0.5 |
12.5 |
| |
|
|
|
|
|
| Energy Consumption per day Total = |
140 Watt-hrs |
|
140 Watt-hrs = 25.5 Watts per hour
5.5 hrs/day
So on average, the hourly usage in this example is 25.5 Watts. However, we must add in an additional 30 Watts to account for the Refrigerater when it turns on. The adjusted total is 25.5 Watts + 30 Watts = 55.5 Watts per hour.
We must therefore install a Solar Panel System capable of producing at least 55.5 Watts per hour in order to ensure we have sufficient energy for our needs. Two 32 Watt panels or one 64 Watt panel would be capable of producing the 55.5 Watts per hour needed however, we must account for cloudy weather and battery losses (15% and 20% respectively). Therefore, we recommend adding an additional 32 Watt panel to ensure sufficient energy production.
NOTE: All the lights are DC Fluorescent which provide about 9 times more light per watt and are located close to the place needed (i.e., one by the sink, stove, table, reading chair, etc.). This is called task lighting. In this way a 4 watt fluorescent is roughly equivalent to a 30 watt incandescent and a 6 watt fluorescent is equivalent to a 54 watt incandescent. Most any size fluorescent bulb is available for bright lighting.
|
|
|