An inverter strictly speaking converts DC to AC. If by the term inverter you mean uninterruptable power supply (UPS) this will include your energy storage (i.e batteries) then you will not have power when you need it if you turn it off since you are not keeping the batteries charged. If your system maintains available DC power without the inverter (i.e. batteries charged by wind or solar or even a separate rectifier connected to the regular AC power) you can turn it off and turn it on only when you actually need it. inverterreview.com