The answer is more semantics than anything else! As posted already, if it is not producing AC, then it is "not in use". But if it is drawing current when connected to a battery, then it is "switched on". The unit on-off switch SHOULD be double pole and disconnect the battery source when in the "off" position, but unless you have a circuit diagram and know how to read it, the only way to be sure is to measure the current of the input cable(s) in both positions.I wondered if anyone could help me understand what the definition of 'not in use' is (a day, a week, a month) and what would happen if I left it permanently connected? I've been searching Google for answers but not really found what I'm looking for.
Thanks, Darron
ALL invertors will draw current when switched "on" regardless of any load, albeit most of them less than 1 amp or so. They are also most inefficient at low load conditions, which is why some of the answers here are asking what you are going to use it for? This can mean that the current draw from your battery if just using it to charge a phone, may be twice what is actually needed, ie; only 50% efficient. At their full rated load they may well be around 90% efficient.
Really, a 1,500 watt invertor should be used on 24 volts to be of more use and halve the input cable size.
Whatever it is, make sure to mount it in the coolest place that you have and that the cooling fans are not obstructed.
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