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Figure 2-1 shows the relationship between ambient temperatures and the
length of time the unit will supply an output power level. Choose the
curve with the temperature range most closely approximating that of the
inverter
/charger location, then look for the time in minutes. The
intersection of the time and temperature will indicate approximately the
output power of the unit. For example, between – 40 °F and 77 °F
(-40 °C to 25 °C), you will get 3000 watts for approximately one minute
or 2500 watts for 3 minutes. Times shown in this graph may vary with the
actual operating conditions.
Calculating Size of an AC Load
Operating time To determine how long you can run your loads:
1. List all the AC loads you think you will use and determine their
power requirement. You can usually find this information on a label
near the power cord on the appliance.
2. Look in Table 2-1 on page 2–6 to find the load’s operating time or the
operating time of a similarly sized appliance. The operating times
shown in the table indicate approximately how long a load will run
before the inverter/charger shuts down to prevent battery damage.
Figure 2-1
Output power versus time and temperature
0
500
1000
1500
2000
2500
3000
1 10 100
Time (minutes)
Output Power (VA)
-40 to 25C 40C 55C 70C 85C
– 40 to 77 F 104 F
131 F
158 F
185 F
IP1012_AL.book Page 4 Tuesday, May 1, 2007 12:18 PM