Bu, running a block heater on batteries and an inverter is pointless in my own opinion...its not feasible in the slightest unless you have like 10 marine batteries hooked up in parallel.
I left my tech 2 plugged in and on overnight and my truck wouldnt even start the next morning. Thats a TECH 2. How much do you think that draws compared to a 110v block heater?
Are you sure you dont have other problems with the engine...my built motor never smoked like that at those temps.
i have ~15,000 on the motor
with the feasco around getting my block done back in NOV.. when i get a chance i want to go through the block and measure everything again.
i have left lights on my truck for a weekend it start back up.
i am not looking at running the block heater over night. just a 30-45 minutes
and what Jneal said... the suck batterys down fast!