OK Turbo2liter, so if I plug it in during the day while I am running the car, and unplug whenever I stop, I should be able to reduce the frequency of accessory battery charging slightly. And since the accessory circuit is shut off, it won't help charge the battery when I am stopped as I assumed the one on the SL might. I did get the navigation unit to shut down when I unplugged, so I don't think that leaving it plugged in will keep everything up and running once the light source drops below a certain level. If the sunlight is intense enough. It must be pushing enough amperes to hold an electronic switch in an "on" state even though the control system has dropped an input to an "off" state. My biggest concern was how much of my car electronics are still on when this happens. I was wondering if it may create a security issue.
Leaffan, the Sunsei PV trickle charger is one I picked up on sale from Overtons because it worked to charge a back-up video camera battery when I was teaching kayaking. It is meant to attach to a battery and keep it charged while you leave your car parked somewhere for an extended period. Mine came with the accessory plug as well as a set of clamps to attach it to 12volt battery terminals. I have been leaving it on the dashboard, but it slides around a bit more than I would like, so I will probably save it for other purposes. Perhaps I can get it to charge my phone while I'm camping. On to another project..
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