# What happens to input power when inverter switched off?

1. Apr 24, 2016

### says

In a PV system, what happens to input power when an inverter is switched off?

I noticed that voltage does not change much but the current does. Does this mean the resistance increases?

2. Apr 24, 2016

### davenn

define that question clearer .... switched off .... where ?
before or after the input ?
what sort of inverter ?

then this Q may be answered better

Dave

3. Apr 24, 2016

### says

After the input power. So the sun is still shining on the PV panel, but the inverter is switched off.
I don't know much about inverters to answer your last question, sorry.

4. Apr 24, 2016

### anorlunda

If you disconnect a PV panel from its load, no power is produced. Power P is voltage times current, $P=VI$. Therefore if $I=0$ then $P=0$.regardless of $V$.

If you wish, you can view an ideal switch as a device that changes resistance from $R=0$ when closed to $R=\$infinity when open.

Does an inverter really disconnect from its source when off? I'm not sure about that.