Dave, a 400 watt inverter supposedly can (if you believe the advertising and that 400 watts represents output????, its NOT a perfect device, it puts out less energy then supplied to its input remember, theres heat losses) at 120 volts, supply up to 400 watts which at 120 volts = 3.33 amps continuous AND WITHSTAND IT AND DELIVER IT AND NOT OVERHEAT OR OVERLOAD......... IE it can deliver 400 watts of power which is volts x amps if theres a resistive load.
BUT THATS ONLY HALF THE ANSWER It can take 12 volts DC and invert it to 120 VAC and deliver 3.33 amps at that voltage (assuming the 400 watts is its output rating) BUT ONLY SO LONG AS THE BATTERY CAN DELIVER SUCH. The battery only stores x amount of energy so once thats depleted NO TICKY NO LAUNDRY. A typical stored energy battery rating may be in Amp Hours and if you know that number and the inverter specs and losses, then you can compute for how long the inverter can deliver 400 watts of 120 VAC output power.
The 400 watts inverter rating is its power delivery measurement/capacity NOTTTTTTTTTT the Amp Hour energy storage ratinG of its internal battery.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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