I believe the Redarc has a built in solar controller. It is also setup for lithium batteries.
i am actually in this dilemma right now aswell, i am building a 4x4 Van and was in between the Ctek 250DA + Smart Pass, Redarc Manager30, Samson Evo. the reason i am only looking at these 3 is because i want an integrated charge controller that can take care of AC/DC/Shore power instead of having 3 separate charge controllers and dealing with them confusing each other at the battery.
Why do you need 110v power? what appliances do you want to run that need it?
Not really an issue; they won't. This assumes of course, that each charger is set correctly. The CTEK, with the SmartPass will give you a higher charge rate, but, depending on your voltages, you might be better off with a relay (I like the Blue Sea ACR) and properly sized wires. This plus you choice of solar and shore chargers.
In my case, induction cooktop, toaster, Nespresso machine, and microwave. With a big fridge, Webasto Dual top, cameras, phones, laptops, etc. maximum overnight draw is about 150 Ah, more typically, 125 Ah. Depends on weather, and how much you cook breakfast. YMMV.
A 30A charger is going to take on the order of six hours to recharge 100Ah into a lead acid battery. So I would want a larger charger.
But I would have to say your math is wrong. From 100% discharge a 30A battery charger will take 3.3 hrs to charge a 100Ah battery to full throw in another 10% and you are at 3.67hrs total.
Now my 350 ah battery will take on the order of 11-12 hrs to charge from 100% discharge to full.
I can give some real world experience using both a voltage sensing relay and a Ctek DC-DC charger. I have Nissan Frontier and initially I just ran 4 gauge wire with a relay and that seemed fine at first but I soon realized that it was never fully charging the AGM 100ah battery I had in the back. After research this seems to be the common scenario if you are trying to charge a lead acid deep cycle battery just using your alternator. I would only use a VSR/relay type setup with a car type battery being used for things like lights, winches, exc.
I got the Ctek 250S DC-DC charger and it has worked like a charm. Easy setup and instructions. I also have solar hooked up to it which has worked well. When the house battery is charged the solar begins charging the truck battery to keep it topped off.
Depends on the vehicle, or more properly, the voltage of the charging system. I used an intelligent relay on a 2013 Chevrolet and it had no problem charging a 600 Ah AGM battery. The limitation was driving time, not voltage.
Can't comment on Nissan, but many vehicles top out at 13.9v, in which case a battery to battery charger, like the CTEK, REDARC, Sterling, et al., would make all the difference in the world. Hence my original comment to the original poster.
... I have no doubt a vehicles alternator will charge that over enough time, but my goodness, that sure is a big battery. You put that thing in your vehicle with a small crane?