Another project Am I nuts to try this??

[sailaway78]

190 watts????

Funtime,Don't know where the 190 watts came from. The tag on the fridge lists it as 1.9 amps, 110v. AC. My numbers are just rounded off and it is actually a little over, but 1900 watts is a close rounded off number. It will draw approx. 20 amps off the batteries when running through an inverter. Starting draw is around 30 amps, but is about a second, so not even going to put that into the equation.

 

[Funtime]

So 1900W is typo?

1.9A at 110V is 110V x 1.9A=210VA(not watt, yet). The compressor motor is an inductive load, so the power efficiency is not 100%. In a AC circuit, only pure resistance load have 100% efficiency,(like a light bulb, although pure resistance load in AC circuit almost non exist, theoretically.) Watt is the unit use to indicate the usable electrical power that can be truly converted to mechanical power.If you fridge has a 190W compressor and draw 1.9A at 110V(=210VA), then you divide 190W by 210VA, 190/210=0.904, about 90%, represent the power efficiency of the compressor motor. By regulation, any electrical equipment connected to power grid should have minimum power efficiency of 80%.Could this explain "190W" question you got?Other than this, all other figures you mentioned are quite normal.Sorry if I got you wrong.

 

[Fred Ficarra]

And to further add fuel to the mix

(is that mixing metaphors?)An Adler-Barbour draws 5 amps at 12 volts using a similar motor, if not the same motor as the Danfoss. And it runs about half the time. (2.5amp hour draw all day long.)