Are lithium batteries worth the cost?

Siletzspey wrote:
....

For my truck camper and boondocking, 300W of solar in summer gives me a surplus of power in summer, and FLA/AGM would be fine. Come winter with solar production way down and furnace times way up, I could only survive long stints with LiFePO4, hence I went LiFePO4 despite the cost.

--tg

You could spend $150 on 1000W inverter generator and survive it even better, although with less convenience.
It is all about how much money you are willing to spend on doing nothing down the road.