>
>> Whether the key is on (with either on) or the key is off (with just the one
>> in the back), the results are the same: inverter only stays on for a few
>> seconds, indicating that it's not getting enough juice. When the engine's on
>> (and, hence, alternator's on), it stays on. But with the engine off, the
>> inverter stays on for just a couple of seconds and then shuts down. >
>Which proves that the battery needs to be replaced, as you've already been
>advised. Sheesh.
Not necessarily - don't know if this has been recommended, but he needs to check battery voltage with the inverter running, as well as voltage at the power outlet. Should not be more than 0.01 volts difference. If there is a voltage drop the inverter may go into low battery shut-down, even if the battery is good. Remember, a fully charged battery is 12-12.6 volts. A running vehicle can be up to 14.6 volts. The shut-down could be as high as 11 volts, or as low as 10?
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