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Could I connect to the ODB socket to trickle charge my car battery with a solar panel on my Toyota Prius 07, and how to?

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  • Welcome to Motor Vehicle Maintenance & Repair! Are you talking about the 12v battery or the high voltage battery? Jun 23 at 9:37
  • The 12 V battery Jun 23 at 12:55
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that's actually a good idea - some cars' cigarette lighter is switched with ignition (meaning it's off / not connected to the battery when the key is out of the car)

it think this is what you're looking for: http://www.kerrywong.com/2020/03/06/making-an-obd-ii-solar-trickle-charger/

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  • Thank you so much, that link is perfect. Thanks for taking the time to answer. Jun 23 at 10:16
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    That article is so wrong, It's bad to leave a modern car for a week? A properly running vehicle can sit for much longer than a week and still start perfectly fine. If it doesn't, either the battery needs replaced or there is a fault in the electrical system somewhere. I have a hybrid that's sat for over a week without running and had 0 issues. My truck sometimes sits for a month without being used and again the battery starts it just fine.
    – Phaelax z
    Jun 24 at 14:14
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    @PeterM It took several weeks for my hybrid to go flat in the pendemic we are in. I just want to mitigate this issue in the future. Jun 24 at 14:52
  • @Phaelaxz the question was about applying charge from a solar cell to car battery via the obd2 port - the mentioned article explains that quite well. It's another question why the battery may be empty (it's old; driving and seasonal habits don't allow for proper top up - think driving short distances when it's cold outside with all lights on etc) All modern cars still have a 12 volt battery, that is required for the car to work (even electric cars - eg. tesla - and hybrid cars; I stand to be corrected on this). Also truck battery cca is much higher than car battery cca.
    – PeterM
    Jun 25 at 17:06
  • I never said cars don't have a 12v battery, most stopped using 6-volt systems by the end of the 50s. And I'm not sure when trucks came into the conversation. If that's the driving pattern, sounds like he'd need a trickle charger to maintain the battery, in which case I don't see why the solar idea wouldn't work.
    – Phaelax z
    Jun 25 at 17:22

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