actually, there may be an easier method. however, not without a little wiring know how. and you definitely don't want to exceed a charge rate higher than the 12V socket was intended for. there are other threads on how to make a direct 12V connection from the fuse box so i won't post it here.
you would need to have a direct always-on 12V connection (either from the 12V battery terminals, or fused connection point).
i use a goal zero sherpa 50 to power a dashcam for longer periods when i'm out of town. it takes a 12VDC from the 12V battery (via the fuse box), and outputs 12VDC to the dashcam. this connection is always on, and i have a box that monitors the voltage which will shut off the connection if voltage drops below 11.6-11.8V to keep the car's battery from going flat.
these units were designed with using solar panels for on-the-go power (and off the grid) and they have a series of solar panels that work with a variety of lithium-ion power banks/generators. so all you would do is set the 12VDC (or whatever output) from the solar panels, and output the 12V from the sherpa (or similar charger/powerbank) to your 12V socket. basically reverse of what i use mine for.
a bit pricey for similarly performing chargers on the market, but i found them to be pretty robust and reliable. i have had one connected to my car may be a year or more. they are very modular so i can even take it out of my car and power a host of devices if i'm at the beach, camping, etc.
here's the one i use (it outputs max 8A on the 12VDC out)
Sherpa 50 Power Pack | Power Packs | Goal Zero
and you would need this cable (or similar)
Guardian 12V Adapter | | Goal Zero
as with any modifications and add ons, i highly recommend monitoring consistently and make sure you have good connections. check for any codes thrown from the car and always use a fuse. don't attempt if you're not comfortable with wiring.
I am not sure there is a direct connection from the OBD II port to the IMA Battery as the IMA System is over 100 Volts. :surprise:OBD II is mostly signal level and is used to read information from the computers in the car and sensors. IMHO you would have better luck feeding the Solar charger through the power port, at least that circuit can handle full under hood voltage. Others who are more knowledgeable may have more information.:nerd:
