Very very low.
We have 16 49 3 (2014) and use all lights as long as we want and need, 12v pump turned on all the time when free camping, tv on when we can bear to watch it (up to 2 hours per night for news etc) and we always have about 4 iPads, phones etc on charge via 12v.
All powered by 150 solar panel and standard 100 battery.
It is more than sufficient for power needs and charging, even in winter and overcast. So much so we have now ditched our portable 120 panel as we don't need it.
Good luck with calculations.