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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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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