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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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