Well I bought a 1400W inverter (24V DC supply and didn't run my battery) from India and it worked fine until a section of it got fried by extreme high voltage from the utility while I was charging the battery. Obviously the 24v dc source made it draw less current. But going by the chassis temperature, and the average length of time it was on, I believed it drew much lower than you would expect (ordinarily it should gulp 58.3A continually although I rarely load it to its full capacity).
Now I'm thinking of building something similar. Oh! I couldn't return to the manufacturer cos the warranty period elapsed.