A few 12V DC fans are universal in that they also run on AC but most are not.
Since you already have the fans, give them a try. Sanyo (San Ace) has traditionally used analog inverters (not sure if it has changed since then) while Delta started using the far superior DSP inverter since 2009 or so. Therefore, it's probably worth upgrading if the idea works.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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