Hello,
This is a small portion of a larger system I'm trying to tweak. I have attached a rough picture of this part of the circuit.
Basically, we have a system that ties into a car battery when we want, but also has its own battery. The system is wiring to our battery by default. We can parallel our battery with the cars battery/alternator at will from other methods at our own discretion. We do this to charge off the alternator but only when the car is running. We never tie our system in during the crank period.
Additionally we can use an AC Input to charge our battery with an off-the-shelf battery charger.
The scenario I am trying to solve is what happens when the car is on, our batteries are tied together, and it is also being charged by an AC Input. While electrically there is no reason to do this, I am trying to safeguard against the users being stupid.
Would the simple solution of adding a diode (large one that can handle the current running through it!) as shown in the picture work? Sometimes easy solutions make me think I'm missing something?
Edit: I forgot something else important. We want protection in the event that the car battery gets damaged, so that it doesn't take our system with it. So lets say everything is tied together willy nilly then all of a sudden the car's battery shorts to itself or goes crazy, we want to isolate that from our battery trying to compensate and pulling everything down/high amps. Like we don't want our battery to try and power the car's functionality if the car's battery breaks.
Thanks
This is a small portion of a larger system I'm trying to tweak. I have attached a rough picture of this part of the circuit.
Basically, we have a system that ties into a car battery when we want, but also has its own battery. The system is wiring to our battery by default. We can parallel our battery with the cars battery/alternator at will from other methods at our own discretion. We do this to charge off the alternator but only when the car is running. We never tie our system in during the crank period.
Additionally we can use an AC Input to charge our battery with an off-the-shelf battery charger.
The scenario I am trying to solve is what happens when the car is on, our batteries are tied together, and it is also being charged by an AC Input. While electrically there is no reason to do this, I am trying to safeguard against the users being stupid.
Would the simple solution of adding a diode (large one that can handle the current running through it!) as shown in the picture work? Sometimes easy solutions make me think I'm missing something?
Edit: I forgot something else important. We want protection in the event that the car battery gets damaged, so that it doesn't take our system with it. So lets say everything is tied together willy nilly then all of a sudden the car's battery shorts to itself or goes crazy, we want to isolate that from our battery trying to compensate and pulling everything down/high amps. Like we don't want our battery to try and power the car's functionality if the car's battery breaks.
Thanks
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