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Added volt and amp meter to properly measure power. At 20 psi the engine generator puts out about 30 watts, at 40 psi watts go up to about 80. If I really stoke the fire I can get more. Tops on these runs was about 100 or 1/8 HP. The engine is rated for 1/4 hp so obviously there are some losses with the exposed steam pipe, and losses in the stator.
I am very happy with the monotube boiler and automatic controls. After 1 hour I had used 1.5 gallons of water, and about 5 Lbs of wood.