Electrical System integration advice…

[Camjamcur]

Thanks for your reply! I’m looking at either a renogy 20a B2B or the renogy 50amppt/30aB2B combo unit. My main concern is the small alternator in the van may not be powerful enough for a 30a draw. What do you think about those options?

[Camjamcur]

Also, would I need to remove the existing isolator and relays, or could I just plug in the B2B somewhere in between the house battery and isolator? The alt is a 90a just fyi.

[booster]

Originally Posted by Camjamcur

Also, would I need to remove the existing isolator and relays, or could I just plug in the B2B somewhere in between the house battery and isolator? The alt is a 90a just fyi.

That is a tiny alternator for this kind of stuff as you will probably have only about 30 amps max to put to charging and that would be with not a lot running except the engine. AC on high fan, headlights, etc on and you would be even worse off.


Are you counting on solar for all your power needs?


If you add a b to b, removing the isolator is best because it would give you about a .7v drop just going through it and you don't have any voltage or power to waste. 20 amp b to b would be as big as you could go, I think.

[Camjamcur]

Alright, I'm gonna go with the 20a B2B. So the path will look like; alt→starter battery→B2B→positive/negative bus bars?

[Camjamcur]

Here's another question, the cords coming in and out of my transfer switch are all 3wire, but the switch only takes positive and negative inputs and outputs, no ground. what do I do with those 3 ground ends around the transfer switch?