How much electiticy costs to run small RV heaters?

Hi Fred,

A single 1156 bulb may draw 24 watts @ 12 volts dc. Assuming 4 are on then 100 watts is a ball park figure--especially as most converters are much less than 100% efficient.

Your figures on parasitic loads are 35 amp-hours per day (@ 12 volts) that equates to about 400 watts which I "rolled" into the lighting figure. I don't want to sit in the dark.

Granted, the OP, may be using less. A kill-a-watt meter will tell the tail.