How much power does the 1750 inverter use from the battery

reassembled your system, it will help

The 14 AWG Positive wire should be connected to one side of a 30 A relay (typical fog lamp relay available at most automotive stores). The relay's other 30 A contact should be connected to the battery positive post via a 10 AWG (up to 6 ft/2 m)

Recommend (1) open the inverter (with battery power disconnected) - and inspect incoming cable between the power switch and the battery cable entrance. Possible that a wire overheated and shorted on the input cable.
Next (2) if problem cannot be located, go to http://search.harborfreight.com/cpisearch/web/search.do?keyword=inverter and replace it with at 2000 watt inverter for 130 bucks.

I would use 10 gauge wire for it. It will be a little overkill also but you will be safe that way.also to let you know the smaller the # for wire the thicker it is. Yes Green is ground.

It's complete garbage design. See here:

http://ludens.cl/Electron/chinverter/chinverter.html

the inverter fan just kicks on to keep the system from overheating. Its perfectly normal.

These fuse are often intend to protect voltage inversion. (reverse voltage)
So, if the eight fuse are blown, then maybe the voltage red and black wire were not connected to the correct polarity.

then again, even if these fuse are intend to be use as reverse protection, it may occure that transformer short out, transistor short out and many other short circuit inside the inverter as occure.

So replacing all eight fuse might not restore the unit function, they may even blow again.
Also, reversing polarity that cause the fuse to blow might have damage the transistor stage.

I am still, investigating few other problem with those unit.
I don't have all answer yet.

regards,

Hitheck

It would depend on the load being driven by the inverter (which would determine the current drawn by the inverter), the capacity of the batteries and the shutdown voltage of the inverter.

turn the unit off and then disconnect the negative from the back and turn th unit back on that way the inverter will use all the charge kept inside.
Reconnect the negative and start the unit ...I did that to my unit and for fun I asked tech support for help they told me that I need to buy ne one...After I reset my unit I been using now since for over 2 years...sometime it come back one every few months if I have high voltage coming and I redo this again and it works...save your money

I believe that the actual unit may have other problems and that you will need a schematic to aid in your troubleshooting of this issue. Once you have the schematic and a multiment you can check the voltages to see if things ar as they should be and then we can look at what is happening.