AZ Hummerboy, a 600W inverter should be plenty for running the motor of a key grinder.
You can generally figure about 746W for a 1 HP electrical motor.
I would imagine a key machine would probably have something MUCH less than a full HP. My guess it is probably just a quarter HP (about 187W) or perhaps as much as a half HP (373W).
And Zing, I also have crappy luck with rechargeable tools. But having a 1000W inverter? Why not just go only as large as the single largest power tool you want to run? Then just don't run more than one tool at a time.
I believe those wattage numbers are if the tool was being used with maximum load, not under normal loads. You might not want to blow fuses at an inopportune time, so at least meet that full load number.
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