[AZ-Observing] MSW inverters

Fellow Stargazers,
I trying to find a way to power my old (ca. 1985) Orion drive system remotely 
and lose the need for an extension cord.  It's a single RA drive, with a 
synchronous 120 VAC motor.  What I'm wondering is, has anyone used a modified 
sine wave inverter to power these things?  True sine wave inverters are 
prohibitively expensive.  I'm concerned about tracking accuracy, of course, and 
possible damage to the motor.  My online search provided conflicting advice.

Dan Heim

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