Both wires of an inverter are live

OneZ said:

Greetings,

So my friend bough an inverter, it has 1 input 2 outputs ( same as a UPS ). He simply connects a 12v battery to it ( a car battery ), connects it to the main electricity so the battery can be charged, then when main electricity goes down he connects some devices to it's output outlet.
The thing is when I use voltage tester screwdriver on it's outlet it lights up on both wires. Shouldn't it only lights up on one of them like any normal outlet ?
By the way, it is working, he connected a TV and it worked normally.

Thanks.....

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Thefailsafe2012 said:

Gordon Bennett don't mention a neon screwdriver here

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OneZ said:

The thing is when I use voltage tester screwdriver on it's outlet it lights up on both wires.

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OneZ said:

We live in a very poor country. We are poor. Voltage tester screwdriver is a good option.
Anyway, I figured out the reason myself.
Thanks for the supportive and useful comments.

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