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That's awesome, ban I ask where you get those fans? Do they plug Obrien a 12v outlet?
It's a homemade system I designed and manufactured myself. I've also made several other custom versions for fellow dog enthusiasts, which incorporate 2, 3, 4, 5, or 6 fans. Example pictures of 6 fan controller unit below, picture 2 shows powerpoiint plug for scale.
Yes, they plug directly into any vehicle's 12V powerpoint outlet. The fans are highly efficient. Amperage draw is extremely minimal So, little to no chance of a dead car battery at the end of the day, provided the vehicle's existing battery is healthy. Typically rated for between 50,000 to 100,000 hours of service. I've been using mine (intermittently of course) for over 10 years now, completely without failure or maintenance. I've never had any of the other systems I've made returned for any sort of wear or breakage issues. No complaints, in fact nothing but praise and positive feedback.
I believe that my dogs, and other people's dogs, have truly appreciated my efforts.