Computation of load from 12v battery converted to 220v

To determine if a 12V 100Ah battery can supply power to 11 LED lights rated at 18 watts each (using a 1500W half-wave inverter), we need to analyze the power requirements and the current draw from the battery.

1. Calculate Total Power Consumption

Power per LED light: 18 watts

Total number of LED lights: 11

Total power consumption:

Total Power =18 W×11 = 198 W

2. Inverter Efficiency

Assuming an inverter efficiency of about 85%, the power drawn from the battery will be:

Power from battery = 198W = 233.53 W

0.85

3. Current Draw from the Battery

At 12V, the current draw from the battery can be calculated as:

Battery P​= 233.53W​=19.46 A

V 12V

4. Battery Capacity in Hours

The 100Ah battery can supply:

Runtime(hours)=100Ah​= 5.14 hours

19.46A

Conclusion

Yes, a 12V 100Ah battery can supply power to 11 LED lights rated at 18 watts each, connected to a 1500W half-wave inverter. Under ideal conditions, it can operate for approximately 5.14 hours before depleting the battery. However, consider that actual runtime may be less due to inefficiencies and battery discharge characteristics.

If 12V 100Ah battery only operates for about 1 hour while supplying 11 LED lights rated at 18 watts each (connected to a 1500W half-wave inverter), several factors could be contributing to this shorter runtime:

5. Factors Affecting Runtime

Depth of Discharge (DoD): If the battery is not designed for deep discharge, discharging it too much can reduce its capacity and lifespan.

Battery Age and Condition: Older batteries or those that have not been maintained can have reduced capacity.

Temperature Effects: Cold temperatures can reduce battery performance significantly.

Inverter Type: Half-wave inverters can be less efficient than full-wave inverters, leading to greater power losses.

Power Surges: When starting up, some devices may draw more power than their rated wattage, especially if the inverter is not specified for those surges.

Conclusion

If your battery only lasts about 1 hour under these conditions, it could be due to one or more of the factors mentioned above, particularly battery age, condition, or inefficiencies in the inverter. You may want to check the health of your battery and ensure that your inverter is functioning properly.