I can see Lucas' point, we live on a boat on Vancouver Island strictly on batteries at anchor. I just bought 6 x 6volt at 250 amp/hrs ea = total of 12 volts 750 amp/hrs.
We bought AGM lead acid sealed batteries ($300 CAD ea) and were kinda choked to learn about the 50% safe drawdown recommendation. That gives me a useful 375 amp/hrs. Ouch!
The same 6 lithium batteries can be drawn down to 20% meaning I could have used only 4 lithium batteries, helping with the cost. They can also be charged at a much higher rate and they weigh a lot less too.
These 6 batteries can't power much. We have a 5 amp frig, led lighting, inverter, and a 6 amp heater in winter. Our 600 w of solar is great all summer but come September we need to run the Honda genset for an hour a day, going into 2 hours in October, going into you know the rest.
Wrapping up, ya always need more batteries than ya think, esp with all the little charging devices adding up.