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Terrible write ups - I would go for Picker. That is the correct type of relay, however. The starter is not an issue. Remember, the relay is normally closed, it opens when the engine is running.

You are overthinking again. You want the solar/shore power to raise the voltage of the house battery to the point that it closes the circuit in the SBC. At this time the charge will be shared with the starter battery. (It won't take much, only an amp or three.) If the sun goes down or you unplug...

Agreed. A circuit is a circuit. There is always a challenge getting from logical circuit design and practical installation. (And vice versa is even worse! o_O) True, but he wants to use a lithium camper battery and lithium has challenges as a starter battery given the vagaries of vehicle...

Nope. Those are SPST relays. That means the contacts are open until connected. You want a DPST relay. (Double pole/Single Throw) REDARC USA will sell you one, but they are very expensive. https://redarcelectronics.com/products/rk1260_relay_kit Call Picker Components...

Not that I can see. I have a lot of solar so I would never disconnect the ACR when camping - I want all of my batteries full charged all the time! But your suggestion is not bad if, for some reason, your camper batteries were way down and your solar resources limited, i.e., small panels, shade...

Interesting toy. It appears to be designed to protect the alternator from overheating by imposing 20 minute cool off sessions. Will not work Chevrolets, among others, that routinely exceed 15v, especially in winter. (I had the same problem with the SBC on my Chevrolet - the 15v cut off made it...

With no guarantees: I think that the SBC is controlled by it's ground lead. So, if you use a normally relay to control that, you should be able to set up a system where the SBC circuit is open (i.e. is off) whenever the engine is running. (You can test this by setting up the SBC and...

You need to post this in the 12v forum where this stuff is beaten into the ground. (By folks who actually know what they are talking about.) A quick scan and you will have all of your answers.

Let us review the bidding again. Don't make this harder than it is - simply proceed step by step To charge the camper battery you connect it to the starter battery. Literally the positive terminal of the starter battery. Do not disturb the factory wiring between the alternator and the starter...

Not at all. You use all of the same cables. The only new cable is just enough to bypass the DCDC and add in your switch or relay. But you are right, because this is a starting cable, it does need to be heavy enough to carry a starting load. Look at my diagram - it may make it easier to see that...

None of this is hard. The attached drawing is a bit crude and lacks fuses, wire gauges, etc. But you can figure it out. The REDARC (or any other B2B) goes between the starter battery and the camper battery. Use proper gauge of wire and fuse at each battery terminal. Done. Now, assuming that we...

OK, now you have lost me. The Magnum Smart Battery Combiner is merely a voltage sensing switch, sometimes called an intelligent relay - it connects and disconnects based on the voltages you set. It is not a charger. You put it between two batteries and, when set up properly, it will close the...

Probably no need. Just make sure that the REDARC is wired to the primary starter battery, not the secondary one.

The ACR and the REDARC BCDC perform the same function - you use one or the other. The REDARC, like all B2B units, merely adds a new voltage regulator for the camper battery. Do you have the ACR between the two AGM batteries under the hood? If you move your camper loads to the lithium battery...

Again, WAY overkill to use an ACR when a simple switch will work. If you can't use jumper cables to bypass the REDARC, then a length of wire, say 10 AWG, with a simple toggle switch would give you a quick and dirty bypass. But, as noted above, how long will your truck sit without running? Might...

You are, to a degree, trying to over think this. The folks at Battle Born have a good reputation of telling the truth about their products. The AMP-L-START and the TRKL-L-START are just solid state voltage sensing relays. The TRK-L-START just passes less amperage and thus might be perfect for...

This is the major conundrum with all voltage sensing devices intended for use with lead acid batteries; the resting voltage of a lithium battery is higher. Most VSR devices work on numbers like these: Full Charge: 12.7 - 13v Charge source present: 13 - 14.xv. So they disconnect at around 13v...

The BCDC 1225D should work well between the AGM starter battery and the lithium camper battery. I would have preferred the larger 1240 or 1250.

See: https://diplostrat.org/about/ Basically, the Bengal uses lower cost, more mainstream systems.

I think that I am confused and suspect that you are as well. You have two AGM batteries "under the hood." And, assuming a typo, a National Luna relay isolator. Does that mean that one of these two batteries is a starter battery and the other a camper/house battery? You want to add a lithium...