![]() As for the current flow between the batteries, the current is acceptable and our "stock" wires can handle it. Then the voltage drops to 12.4v, which will still work for an automotive system. Hook up a 12.7v to an 11.8v in parallel with an alternator charging them. ![]() Batteries are also charged to 12.7v~ before they are considered "good". What it comes down to is a definition of a "dead" battery (this is where I made my error).īatteries are useless at 11.8v and at that point are considered "dead". The readers digest version of the posted article is. With the alternator feeding them, the current from the alternator would be minor and unable to keep up with the draw, you'd be lucky to get 7v. ![]() Also, the wires (unless they were a ridiculous 4/0) would probably become quite hot. Since you're car operates on a 12v system this is no bueno. The voltage across the batteries would immediately drop to right around 6v. If you had a battery at 0v and another battery at 12v hooked up in parallel with an alternator charging them. What have you guys done for battery isolation and where did you get them?Įlectrician version (what I was worried about). I have seen some solidstate isolators but the ones I have seen have been in excess of $400, this seems like quite a lot considering what I am getting out of it. ![]() This can short the batteries and fry electronics (this is also a no-no). When operating a deep cycle battery with the vehicle off it can decrease the voltage across the battery (duh) but when the solenoid turns on a surge of power will run from the starting battery to the deep cycle. They have solenoid based isolators, these combine the batteries in parallel when the vehicle is on but separate them when it is off they can also be designed as voltage regulated isolators that isolate when starting battery is below a threshold. This voltage drop stops the batteries from getting a full charge and is a no-no. So I am installing a deep cycle battery in my 2005 suburban and I'm trying to figure out how to separate it from the starting battery to prevent them from depleting themselves when the vehicle is off (also, I want to use the deep cycle to run things when the truck is off.)įrom my understanding, diode based isolators will prevent the batteries from depleting each other but have a voltage drop. ![]()
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