Thanks, Fromaron. I believe it's capacitor-regulated, as I had to replace the large capacitor a few years back. I'll chase up my solar guy to fix his frequency meter and check it for me.
The adjustment was actually a screw that moves the carby butterfly to change the engine RPM. A new carby is bound to result in a change in RPM, and I think it wasn't checked to see that the base RPM was correct. My understanding is that the engine at X RPM gives 240VAC @ 50Hz - if it's less than X RPM, you don't get 240 volts and you don't get 50Hz.
If it cooks the tumble dryer, so be it - they're not expensive. The battery charger OTOH, is upwards of $2K - fortunately it's very forgiving as to what it's being fed
cheers
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