Are lithium batteries worth the cost?

If you need the power I believe they are worth it. I plan to build my own and save some money.

Something like this: https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30231150.cfm

jimh425 wrote:
It just depends on how far you want to draw your batteries down. Another option is to add batteries in the corner of your bed and connect them all together.

Should be a fun thread.

I have a sine wave inverter for electric blankets and coffee. I can get two nights out of the two batteries I have now. After that, it becomes iffy, and the fridge starts talking to me about low voltage...

Double that capacity would be awesome. LI batteries weight half as much as regular deep cycle also.

It just depends on how far you want to draw your batteries down. Another option is to add batteries in the corner of your bed and connect them all together.

Should be a fun thread.