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Generator Auto Start - When to Stop Cranking
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NorthGuy:

--- Quote from: frostheave on February 08, 2019, 11:40:23 pm ---I wonder if it is linear, i.e. the frequency would increase 1Hz for every 60 rpm increase.

--- End quote ---

Of course. One revolution is one cycle in AC. Some big generators run at 1800 rpm - they produce two
AC cycles per revolution.

After it starts, It may slow down or speed up a bit when the load changes. May even go below 50 Hz when it tries to start a motor, may even die of overload.

If your goal is to protect the loads, then you probably need to monitor both frequency and voltage, which all can be done through a single ADC.

Assuming your generator has grounded neutral and your electronics is grounded too, you don't need a transformer to monitor voltage - a voltage divider will do.
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