I use a portable power source instead of a generator. I forget the brand I
use, but it looks remarkably similar to this one
http://www.tooltopia.com/rockford-ppjs2976dlx.aspx?utm_source=google&utm_medium=cpc&utm_campaign=paid_search_google_pla&scid=scplp7931804&gclid=CLmGtMbl1MwCFUg8gQodw5MM-w

Works well. Charges quickly, and I can get over 20 treatments out of one
charge. I haven't gone so far as to deplete the battery fully, so I don't
know how many I could get.

Only down side is you have to use the "boost" to activate the OA, which
means you press a button every 30 seconds. But I keep it in my wife's car
when not treating, in case her battery breaks down, or she needs an
emergency charge on her phone or something.

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