Truck Battery Relay

MEXICOWANDERER wrote:
To protect the relay I sure would consider a FUSE. They make high amp fuses for original equipment for automobiles. I would consider a circuit breaker to have too sloppy a response.

And remember there are TWO ignition circuits in an ignition switch; Ignition 1 for the ignition circuit itself and Ignition 2 which kills accessories during startup and lights up when the key is turned to accessory position.

Yes I have a 60A Maxi fuse at the battery.

And think I'll avoid the whole ignition wiring issue by using that Princess Auto Isolation Relay. Too many contortions required to get ignition switched V out of this truck (2016 RAM 2500).

So, in sequence from the truck:
220A Alternator (14V nominal) + dual starting batteries
60A Maxi fuse
~15' 6 AWG cable from engine bay to truck bed
140A Battery Isolator (13.3V on, 12.8V off, Princess Auto)
1000 PSW Inverter 12VDC-120VAC
~25' 12 AWG, 120VAC, Extension Cord (with 15A waterproof connector inserted in the middle)
500W (max 650W), 120VAC, Meanwell Power Supply Battery Charger in trailer

To protect the relay I sure would consider a FUSE. They make high amp fuses for original equipment for automobiles. I would consider a circuit breaker to have too sloppy a response.

And remember there are TWO ignition circuits in an ignition switch; Ignition 1 for the ignition circuit itself and Ignition 2 which kills accessories during startup and lights up when the key is turned to accessory position.

Actually the best thing about that Princess Auto Battery Isolator is that I can mount it out of the engine bay, back next to the Inverter. Don't have to run any extra wires. Much neater install. Think it's worth the extra $$$.

JaxDad wrote:
I've had good luck with these from Princess Auto, their return policy is certainly second to none.

I've used them on numerous things including the house battery charge circuit on my Class C motorhome, it's probably got 20,000 km of driving on it now.

12 volt 80 amp Solenoid

In case link doesn't work.

https://www.princessauto.com/en/detail/3-angled-12v-ignition-solenoid/A-p8277766e

Thanks, I had forgotten Princess Auto. There's one not too far from me.

I see they also have a simple electronic isolator:
Princess Auto Battery Isolator

Looks like it cuts in at 13.3V and out at 12.8V.

Finding an ignition 12V in my engine bay might be a bit difficult. This isolator would solve that.

Hmmm, yes there are cheaper ones even in Canada.
Like this:
Amazon.ca #2

I've had good luck with these from Princess Auto, their return policy is certainly second to none.

I've used them on numerous things including the house battery charge circuit on my Class C motorhome, it's probably got 20,000 km of driving on it now.

12 volt 80 amp Solenoid

In case link doesn't work.

https://www.princessauto.com/en/detail/3-angled-12v-ignition-solenoid/A-p8277766e

That relay's the one. There are less expensive ones right on Amazon but maybe not CA. It's the relay we use to charge motorhome house battery only when the engine is running. Since it disconnects with ignition off, the house can't run the chassis down and leave us stranded.