OP
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Its going in to the shop today to be checked but we have 2 other gennys that have been tested in the last 6 mths and one off them gennys did the same thing to a grinder also from screwfix.. I'm just thinking poor quality makita grinder from screwfixApologies, I miss read that you were using 2 at once.
1 grinder on a 3.5KVA genny should be no issue.
Have you tested the voltage the generator is outputting?
If it's not quite 110v and more like 90v the current will increase in the grinder an it also will not run up to full speed. Or the other way the voltage is to high and the insulation is becoming damaged in the grinder.