Depends. Main system is grid-tie with Sunny Boy 1800 and 700 inverters. However some of the panels keep a set of 200ah*24v batteries in the shed topped off for emergency power with a 700 watt inverter. If power goes out I can switch that in to run the fridge, internet, and coffee makers. Very important.

I can also put a 900 watt rotary inverter on the electric tractor. 36 volt by about 120ah capacity using flooded NiCDs.

C