Originally Posted by zack sc
I was wondering about setting things up to allow the use of a different power source for the furnace fan, for example, a Jackery lithium ion battery
that I keep inside the Scamp.
Most importantly, running any arrangement without active propane
, smoke and CO detectors could ultimately be a fatal flaw in the literal sense of the word.
My recollection is that the furnace fans draw about 2 to 4 amps, depending on what model you have. Per a listing on Amazon, the "Jackery Explorer 240 is equipped with a 240 watt-hour (16.8Ah, 14.4V) lithium ion battery pack".
So, if the furnace is running intermittently, it sounds like this arrangement might just about do the job - ? I'm not clear on how far the LI battery in the Jackery can be drawn down.
You would need a double-pole three-position switch to swap the positive and negative leads between the trailer battery and the Jackery. Something like this:
Whatever you do, you will ultimately have to restore the consumed-power to the trailer battery or the Jackery.
As folks have suggested, you could swap the circuitry around to avoid parasitic loads on the trailer battery. It sounds like this would be a good thing to do regardless. The blue LED's electrical
power consumption is so minimal, you might consider just applying some tape to block the light
if they bother you at night.