I'm sure someone else which chime in, but the risks of an inverter could be a bit of a problem. If they don't generate a good true sine wave, you could screw with the electronics. SBIG cameras are not the cheap $50 TV from your local discount store.
I'd ring/email Peter Ward @ atscope and get his advice directly. Many years ago I asked the same question, and was put off an inverter (but don't have the details handy). Don't skimp with this stuff unless you're happy to risk a very expensive paperweight.
That's just my 2c worth - ask someone who knows the gear inside out!
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