I cut up an old computer power cord and wired it into the MeanWell PSU's. Hence, my grid charger plugs into the wall, or into a KaW.
You can use any source of 12V to run your battery fan, even an AC->12VDC brick, as long as it can supply the required 0.6A. Actually, I've tested that fan down to 9V, and you may be able to go much lower than that. Or, you could take the battery out of the car and point a 120VAC desk fan at it, especially this time of year.
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