12v Connector/Isolator
Good Morning! My name is Andy and I am trying to troubleshoot a problem with the charging system for my house battery off of the vehicle motor. I have a wire off the Vehicle Pos Battery post that r...
Forum Discussion
You may have trouble finding any of your answers as there are too many different layouts on how this works... Your setup is most definitely unique to your vehicle setup...
The original way to do this was with a three port DIODE COMBINER which would switch on based on the lower battery DC voltage when it it got drained. The HIGH CURRENT DIODEs in the modern day isolator circuit is not used anymore as the DIODE will have a very LARGE built-in VOLTAGE DROP which gets you into trouble with the modern day of using 14.4VDC, 13.6VDC and 13.2VDC using smart mode charging techniques.
Then the solenoid method came out where a large current 12VDC relay can be engaged combining two 12V Batteries to your ALTERNATOR circuit with a manual OFF-ON switch. When the AUX battery needs charged just flip the switch.
Of course now it all modernized again using smart relay solenoids that monitors the DC voltage coming out of your alternator and when that goes to 14.4VDC the solenoid kicks in and adds the aux battery to the charge circuit. They are only connected to the alternator when they are being charged - otherwise they are separated system and this idea keeps the TRUCK START Battery from ever being discharged from the trailer loads...
The biggest thing today is the larger aux battery banks can easily need more current than the standard duty vehicle alternators can produce and you might end up blowing those up. Now you talking some dollars to resolve that issue..
Using the Truck Alternator to do your aux battery charging can be tricky at best...
The smart solenoids are very popular. I will be using the BLUE SEA SI-ACR Model 7650 Smart Solenoid when I get to my aux charging going for my truck setup with additional batteries... You can go to the BLUE SEA site and read up on how the SI-ACR concept works... Pretty neat concept.
My setup may look something like this just to give you an idea what may be involved... With my HD Battery switch operations here my AUX batteries will most likely always be charged from the trailer side using the on-board PD9260C converter/charger unit.
Roy Ken
The original way to do this was with a three port DIODE COMBINER which would switch on based on the lower battery DC voltage when it it got drained. The HIGH CURRENT DIODEs in the modern day isolator circuit is not used anymore as the DIODE will have a very LARGE built-in VOLTAGE DROP which gets you into trouble with the modern day of using 14.4VDC, 13.6VDC and 13.2VDC using smart mode charging techniques.
Then the solenoid method came out where a large current 12VDC relay can be engaged combining two 12V Batteries to your ALTERNATOR circuit with a manual OFF-ON switch. When the AUX battery needs charged just flip the switch.
Of course now it all modernized again using smart relay solenoids that monitors the DC voltage coming out of your alternator and when that goes to 14.4VDC the solenoid kicks in and adds the aux battery to the charge circuit. They are only connected to the alternator when they are being charged - otherwise they are separated system and this idea keeps the TRUCK START Battery from ever being discharged from the trailer loads...
The biggest thing today is the larger aux battery banks can easily need more current than the standard duty vehicle alternators can produce and you might end up blowing those up. Now you talking some dollars to resolve that issue..
Using the Truck Alternator to do your aux battery charging can be tricky at best...
The smart solenoids are very popular. I will be using the BLUE SEA SI-ACR Model 7650 Smart Solenoid when I get to my aux charging going for my truck setup with additional batteries... You can go to the BLUE SEA site and read up on how the SI-ACR concept works... Pretty neat concept.
My setup may look something like this just to give you an idea what may be involved... With my HD Battery switch operations here my AUX batteries will most likely always be charged from the trailer side using the on-board PD9260C converter/charger unit.
Roy Ken
