question

You'll need to replace the converter.

Maybe look at a multiplus to cover this, lithium charging and inverter. MPPT can go straight to the battery, as can an Orion if you're going to charge from the truck alternator/battery whilst driving.

Why replace the converter?

I am trying to avoid the added cost of the multi plus inverter if possible, shore power or small generator is fine if i absolutely need AC power.

my understanding, please correct me if i am wrong.

The solar mainly and the Orion will be keeping the batts charged, although the converter will not charge completely it will potentially get to 80%, solar or DCDC can finish?

I didn't think it would "compromise" anything.

A. It has a solar controller right now so shouldn't be an issue there.

B. DCDC will only work when truck is running, so not hooked to shore power or gen.

Just trying to head off any cross over/ backfeed between the different systems.

Would adding a lynx and running the solar controller out and the dcdc out through that accomplish what i am trying to do?

Perhaps a little background will help us make some recommendations. Correct me if I'm wrong, I'm only trying to help, but I get the feeling this is your first camper? Truck camper, travel trailer, or otherwise?

If so I would recommend for the first year you use your camper the way you got it. I would however recommend getting a SmartShunt first. It's like a gas gauge for the battery. It will tell you how full it is and how much energy you are actually drawing from it at any given time and show you when it needs to be recharged. Armed with the knowledge of how much energy you are using each day will help you make future hardware purchases that much easier. Why buy more than you need.

A little background from me. I'll soon be 70 years old and have been camping with a travel trailer since 1976. The first unit was a 13 footer so likely not much larger than your truck camper. It had a single lead acid car battery and was only recharged by the tow vehicle while on the road. No genny's or solar and I got along just fine without them. I say this because experience is the beat teacher and it will help you make future purchasing decisions that much easier. Cheers.

Second truck camper, first was a total rebuild project. This one is relatively new. Have had many tow behind trailers/fifth wheels.

This is first rig where we have spent anytime off grid. Most of the info I have looked at online/YouTube is focused on full on builds with lots of solar/batts and large inverters.

I dont need it nor want it so seeking to put in a basic system for better reliability and flexibility.

I guess that is not sexy for a lot of people.

My plan is one 230 ah lifo and maybe 300 watts of solar. Victron 100/50 controller and a Orion Dcdc, all with appropriately sized wire. I just plan on substituting this setup in place of a existing lead acid batteries so in reality the only change to the existing setup will be new pos/neg power coming into the existing converter again with proper size wire. I will not need to tamper with the existing shore power setup and the Gen will go through that as well.

My only question is the best way to collect the power from the two sources before it is sent to the converter and whether there will be any problem setting it up in this manner. Seems straightforward to me except for best way to send power to the converter.

1. Hook the two directly to the battery and run the wires from there

2. Use pos and neg bus bars and go from there.

3. Use Lynx distributor.

Forgot to mention a battery monitor. Will it be necessary with the info that can be gotten from the solar controller and the Orion.

Thanks

I previously had two lead acid batteries with an Off-1-2-Both 4 position switch. Since I changed to lithium, I use the same switch with:
Output 1 = lithium battery
Output 2 = small AGM battery for emergency use if lithium fails
Input = Both solar and DC-DC outputs tied together

For a battery monitor I use the Victron shunt that shows % battery charge for the lithium via bluetooth to my phone.

Not sure why you need new wiring to your converter. There is already wiring from the battery to the converter. You just need new wiring from the DC-DC to the battery. In my case, that is done at my switch. No reason you can't just run new wiring from the DC-DC to the battery.

Ralph

I forgot that your solar charger would be a new device. So, you need to include that in the wiring to the battery. You could either connect the solar and dc/dc together at the battery, or at some other point in the wiring. If you have a battery disconnect switch already installed, you should connect the solar/dc-dc wiring to the side of the switch that is NOT connected to the battery.