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| #
|
Load
|
Quantity
|
Watts
|
Total watts
|
Duty cycle
|
Surge factor
|
Surge Watts
|
Power factor
|
Volt-amperes (VA)
|
Hours per day
|
Days per week
|
Average daily AC watt-hours
|
| 1
|
Generic laptop
|
1
|
15 W
|
15 W
|
1
|
0
|
0W
|
.45
|
33 VA
|
4 hours
|
30 days
|
71 Wh
|
| 2
|
Generic cell phone
|
2
|
5 W
|
10 W
|
1
|
0
|
0 W
|
.5
|
20 VA
|
1 hour
|
30 days
|
12 Wh
|
| 3
|
Generic blender
|
1
|
600 W
|
600 W
|
1
|
3
|
1800 W
|
.8
|
706 VA
|
.05 hour
|
10 days
|
12 Wh
|
| 4
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| 5
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| 6
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| 7
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| 8
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| 9
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| 10
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| Total average daily AC Watt-hours
|
95 Wh
|
| Total VA
|
759 VA
|
| Total VA with surge watts
|
2559 W
|
- Load: The make and model or type of load.
- Quantity: The number of of that particular load.
- Watts: The power rating in watts for the load.
- Total watts = quantity × watts
- Duty cycle = Rated or estimated duty cycle for the load. If the load has no duty cycle a value of 0 should be used. A load with a duty cycle of 20% would be inputted as .2
- Surge factor = Rated or estimated duty cycle for the load. If the load does not have a surge requirement a value of 1 should be used. Common values are between 3-5.
- Power factor = Rated or estimated power factor for the load.
- Volt-amperes (VA) = Total watts ÷ Power factor
- Hours per day: The maximum number of hours the load(s) will be operated per day. If the load has a duty cycle 24 hours should be used.
- Days per week: The maximum number of days the load(s) will be operated per week.
- Average daily AC Watt-hours = Total Watts × Duty cycle ÷ Inverter efficiency × Hours per day × Days per week ÷ 7 days
- Total average daily AC Watt-hours = sum of Average daily AC watt-hours for all loads
- Total VA = sum of Volt-Amperes (VA)
- Total VA with surge watts = sum of Surge watts for all loads + Total VA
