INVERTER RUN TIME
The amount of time the inverter can operate before the battery is expended depends on the
loads and the battery (or battery bank) capacity. Figure 4 can be helpful to estimate this based
on the battery capacity and load conditions.
In this chart, three types of battery setups with dierent capacities are shown; 30 Ah is typical
for one lead-acid group 27 battery taken down to 50%, 90 Ah is typical for one lithium group 31
battery taken down to 10%, and 180 Ah is typical for two lithium group 31 batteries taken down
to 10%. This can be used as a reference to estimate the relative time available with dierent
battery
capacities. The eciency is about 90% at mid power levels (it will be lower when under 200
watts). The exact run time is:
Run Time in hours = (Battery Capacity in amp-hours) x (12 volts) x (eciency)
(Total Power Draw in watts)
STANDBY/BACKUP OPERATION
If the inverter is started while external ac power is present (from shore power, generator, etc.), or
if external ac power starts while the inverter is operating, then it will go into standby mode. When
in standby, the inverter will be ready to operate if the external ac source stops. If shore power is
disconnected, or if the generator stops, then the inverter will immediately provide output voltage
so that the connected appliances will continue operating uninterrupted. During standby, the
inverter will use idle power, but this should be supplied by your converter/charger without
aecting the battery.
5
Total Load
Power
Watts
Run Time
using 30Ah
of Battery
Run Time
using 90 Ah
of Battery
Run Time
using 180 Ah
of Battery
0 (idle) 20.0 hours 50.0 hours 120.0 hours
100 2.9 hours 8.7 hours 17.5 hours
250 1.3 hours 3.8 hours 7.6 hours
500 39 minutes 1.9 hours 3.9 hours
1000 19 minutes 58 minutes 1.9 hours
1500 13 minutes 38 minutes 1.3 hours
Figure 4. Approximate continuous load run time.
Approximate Continuous Run Time vs. Power Usage From 12-volt Battery
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