A 55 amp alternator will provide about 750 watts at full speed - ie. with the rotor spinning faster than about 3,000 RPM. However as the alternator heats up its output will drop off a bit. Also you must subract the 100+ watts "lost" inside the inverter (heat).
Bottom line is the BEST you might expect is about 600 watts continuous from your 55 amp alternator/inverter combination.
Now a 105 amp alternator (about 1,450 watts max) gets you closer. But you still have the inverter loss.
Also you need a way to spin the alternator at full RPM. To achieve this with the engine at idle requires significant (7:1 or 8:1) step-up from crankshaft RPM. Not a simple exercise!
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As for fuel consumption at idle it should be easy to test. Simply rig a temporary gas supply (an old lawnmower tank will do) to the carburetor. Accurately measure a quart of gas and dump it in temporary tank. Now start the engine and note how long it takes to out of gas. A quick calculation will then tell how long you can expect from a full tank.
This post was edited by Bob M at 08:56:39 11/12/12.
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