I would guess the air con would consume the most power and we have 4 of those almost running 24 hours. During the day it is fine as everything we need is powered by direct solar. The one battery they are reconfiguring which will bring us back to 20 kwh storage and I think we would need 30 kwh to get through the night time before it can charge again which is actually the quick part here. The geyser/boiler is going off it's own independent solar kit once it is installed and we are busy waiting for that to happen. I think even during winter and overcast days we will be running the entire day with no problems. I still see some benefit staying with the grid even though I am in a position if required to move off completely by upgrading the current system.