We have two but they are both big uns. A 2000 watt go power sine wave and a 3000 watt Samlex 3000 sine wave converter/inverter. Having said that we beta test for Samlex so we always have the latest greatest but because it is subject to unexpected removal and install we have to have one as backup. We find that both of them have very little current draw on idle. Frankly, unless you have a residential fridge and need a hot backup I wouldn't bother having a second inverter. Throw another solar panel on the roof instead.
JMHO.