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Is there such a thing as an inverted that can be plugged in to 110V and function on a type of “pass through” but pull from the batteries when the 110V is removed.  I would like to ensure power to my bilge heater if we lose dock power.  
 

thanks 

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7 hours ago, Bt Doctur said:

So if you lose power and the inverter takes over how long do batteries last before they also go dead?

Best option is to pull, block, winterize

Heaters pull a lot of amps. The batteries would be likely to last an hour. You must do the math to battery amp hours and the load on the inverter. 

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I agree with the others above. A heater will draw a lot of amps and drain any good battery quickly. It`s probably best to drain the water from the block and manifolds.

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23 hours ago, Steve&Steph said:

Block and manifolds are empty.  
 

Heater is more for piece of mind.  It’s only 400 watts. 
 

 

You need to do the math. 400watts at 120v A.C. is just under 4amps. Now the inverter must convert 12V D.C. into 120v A.C. So 400W being pulled out of a 12V battery is about 30amps.The inverter itself will also consume power. Now add a 5 to 10% loss depending on how good it is. So 33 to 36 amps. Most group 24 batteries are rated close to 70 amp hours. So that would give you just over 1 hour of use unless you want to kill your battery. 

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9 hours ago, Iggy said:

You need to do the math. 400watts at 120v A.C. is just under 4amps. Now the inverter must convert 12V D.C. into 120v A.C. So 400W being pulled out of a 12V battery is about 30amps.The inverter itself will also consume power. Now add a 5 to 10% loss depending on how good it is. So 33 to 36 amps. Most group 24 batteries are rated close to 70 amp hours. So that would give you just over 1 hour of use unless you want to kill your battery. 

Right, I get that.  Heater on at 40 off at 60 heating a small engine bay so it’s not constantly running. 2 group 31 batteries. 

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