Hello,
This is my first post here. I'm looking for some help because I'm fairly a newbie to circuit design of anything more complex than switches and batteries lol.
I'm looking to power a 12v device in my vehicle - and I want it to be on when all doors and hatches are closed and the starting battery remains intact. If any hatch opens or the starting battery looses connection, I need the power to be cut to the 12v device.
I'm planning on having a secondary battery and using a 4-terminal solenoid battery isolator to power the 12v device. I'm told that the only safe type of battery to use in this setup is a deep cycle or marine battery... This poses difficulties because of the toxic fumes they give off while charging. I'd really like to use a sealed battery of lower capacity - something like a 65AH solar battery type - but I don't want it to be damaged by the high cranking amp requirements to start the engine. Advice on this problem is greatly appreciated.
The second issue I am frankly lost on is how to get the power to be cut if a door or hatch opens on the vehicle, or if the starting battery becomes disconnected. I've thought that I could possibly wire a "Normally Closed" relay in parallel with the vehicle's dome lights - so that when the dome-light is powered (regardless of if the bulb is blown), the circuit becomes open. However if the starting battery becomes disconnected - this no longer works. So I would then need a "Normally Open" relay to wire in series with the "Normally Closed" relay so that if the starting battery power is lost - the circuit for powering the 12v device becomes open.
Lastly - because there are two isolated power sources in this circuit - I'm not sure how to connect the two NO and NC relays with the starting battery and the battery that will be powering the 12v device.
All help is greatly appreciated... I've been researching this for hours and I have a GENERAL idea of what needs bought and done - I just don't know exactly how to connect it all and I'd rather not burn out any components when trying to figure it all out ;-)
Thanks sincerely,
Wayne
This is my first post here. I'm looking for some help because I'm fairly a newbie to circuit design of anything more complex than switches and batteries lol.
I'm looking to power a 12v device in my vehicle - and I want it to be on when all doors and hatches are closed and the starting battery remains intact. If any hatch opens or the starting battery looses connection, I need the power to be cut to the 12v device.
I'm planning on having a secondary battery and using a 4-terminal solenoid battery isolator to power the 12v device. I'm told that the only safe type of battery to use in this setup is a deep cycle or marine battery... This poses difficulties because of the toxic fumes they give off while charging. I'd really like to use a sealed battery of lower capacity - something like a 65AH solar battery type - but I don't want it to be damaged by the high cranking amp requirements to start the engine. Advice on this problem is greatly appreciated.
The second issue I am frankly lost on is how to get the power to be cut if a door or hatch opens on the vehicle, or if the starting battery becomes disconnected. I've thought that I could possibly wire a "Normally Closed" relay in parallel with the vehicle's dome lights - so that when the dome-light is powered (regardless of if the bulb is blown), the circuit becomes open. However if the starting battery becomes disconnected - this no longer works. So I would then need a "Normally Open" relay to wire in series with the "Normally Closed" relay so that if the starting battery power is lost - the circuit for powering the 12v device becomes open.
Lastly - because there are two isolated power sources in this circuit - I'm not sure how to connect the two NO and NC relays with the starting battery and the battery that will be powering the 12v device.
All help is greatly appreciated... I've been researching this for hours and I have a GENERAL idea of what needs bought and done - I just don't know exactly how to connect it all and I'd rather not burn out any components when trying to figure it all out ;-)
Thanks sincerely,
Wayne