Battery Backup Power Supply

[gmay3]

Here's a quick back of the envelope calculation/what I would do in this apocalypse scenario (read: I don't recommend doing this in this way, there's no regulation to keep the battery at 12VDC, could be more could be less, could destroy your printer.):

A quick an very general google search says most car batteries have a capacity of 50Ah (Amp-Hours)

I think our printers need something like 11A for the bed and 2-5A for the hotend to lets say 15A @ 12VDC

Car batteries are 12VDC, so (50A-H)/15A = approx 3.33 hrs of run time from a car battery.

*grabs popcorn*