Simple question.  If i have an inverter that takes a 3 supply phase input.  Can i connect the output motor in delta?

yes :-)

just connect it, and it'll work :-)

Wowser.. That takes me back. Power engineering on my ONC. Was it Star for the other type?

Should be Star ideally with a 3-Phase input on the inverter.

Motor dependant obviously, smaller motors are normally Delta for single phase input inverters, Star for 3-phase input inverters.

Yeh i use both 1ph and 3ph input inverters. 1ph always delta i know that. But was unsure about 3ph as although i have only ever seen them connected in star. Someone recently suggested connecting a 3ph input in delta. And why not it seems. Thanks

Because it is wrong in theory Unless it's a large motor, and then it should be.

Why exactly is it wrong in theory? I can have a guess but its tricky to find a good explination as to why it is wrong.

No idea on any of this, googling to find out what everyone is talking about!

Does this help?

http://www.answers.com/Q/Should_a_3_phase_motor_run_on_star_or_delta

The link XEnitys post explains it very well.