Led Indicator And Shutdown Protection; How Power Inverters Work - DieHard 28.71496 Operator's Manual

9. LED INDICATOR AND SHUTDOWN PROTECTION

The LED glows GREEN automatically when plugged into a 12 volt DC source and
will not glow under the following conditions:
1. When the power input from the vehicle's battery drops to approximately
10±0.5 volts, low battery shutdown occurs and inverter shuts off.
Solution: recharge or replace the battery.
2. When the power input from the vehicle's battery exceeds 16±0.5 volts, high
voltage overload protection occurs. Solution: Reduce the voltage range to
between 12 volts and 14 volts.
3. The continuous load demand from the equipment or device being operated
exceeds the continuous load rating of the inverter being used.
Solution: Use a higher capacity inverter or lower rated device.
4. The case temperature becomes hot (exceeds 145°F). Solution: Allow the
inverter to cool. Do not block the cooling slots or air flow over and through the
inverter. Reduce the load on the inverter to the continuous rated output.
RESET: To reset after shutdown occurs, switch the inverter On/Off switch to the
OFF position. Check the source of the problem and correct. Switch the inverter
On/Off switch to the ON position.
NOTE: If the red LED is lit and the green LED is not, see Troubleshooting.

10. HOW POWER INVERTERS WORK

There are two stages involved in transforming 12 volt DC (battery) power into 110
volt AC (household voltage):
STAGE 1: The power inverter uses a DC to DC transformer, to increase the
12 volt DC input voltage from the power source to 145 volt DC.
STAGE 2: The inverter then converts the 145 volt DC into 110 volt AC (household
voltage) using advanced MOSFET transistors in a full bridge configuration. A
"modified sine wave" waveform is generated by this conversion.
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