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device to protect from draining a 12 volt battery
I've noticed that my new car allows draining of the 12 volt battery
through 12 volt sockets even when the ignition is off and the engine is not running. I use to leave charging devices attached to the car at night know they would only charge while I drove around, but now I can't any more as they will drain the primary battery. Does anybody know of any devices that help stop current flow when the source is below a certain level? I'm also interested in attaching some of these same devices to my boat, but would like really only like to pull when the alternator is charging the primary, so perhaps I could set the threshold really high on the boat. I know there are delayed relay devices I could do this with, but I was hoping I could use something that would require no additional wiring that to the + and - of the source battery. Many thanks for any help or information. |
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