Two inverters can be installed in a configuration known as stacking that can provide more power or higher voltage. If two compatible inverters are stacked in series you can double the output voltage. This would be the technique to use to provide 120/240 volts AC. On the other hand, if you configure them in parallel, you can double your power. Two 4000 watt inverters in parallel would give you 8000 watts (8KW) of electricity
