Espar Bunk Heater only runs for 5-6 hours before shuts off

7 amps is a decent amont of power. The problem is your Espar should be hooked up directly to the batteries, not to the low voltage protection. With just an Espar running, four batteries should last 50+ hours easily. They only draw .5-2 amps, and 3 on the highest setting.

At what voltage does the cutout occur? Is it adjustable?

 

I have 4 batteries in my truck and I have my espar hooked right to them . I have left it running for a week and my truck started just fine .

 

Wire direct to the batteries.

 

sound to me like the battery connections need to be checked

 

Last time I looked at the manual they have a prebuilt in low cut at 9volts. So if batteries hit 9volts it'll cut out. Also if you crank your unit on high it will draw more power.

Sent from my Galaxy Nexus using Xparent Cyan Tapatalk 2

 

I just ran mine all weekend and it's still running.

APU started fine today when I went out. It'll run all night as I leave at 5 AM for the next two weeks.

 

Mine was wired to the batteries too, but had a bad ground and would run for an hour then shut off with a low voltage blink code on the controller. Ran a new ground and now it stays on like it should.