Charge controller and battery bank size recommendations for 860w of PV on Sprinter

[Withalligators]

Hey sunking. Based on your recommendations, I'm passing on lithium this time around.
Anyway, I appreciate you taking the time to explain this, but it's thrown a bit of a monkey wrench in my works. I thought I could wire in series or parallel to keep my voltage or amps down. As in, if I wired the whole thing in series, I would have max 5.8A and ~200V for 4 panels. If I did them all in parallel I would have 48.5V and ~24A. A 30A controller is way more palatable than an 80A one if I do 860W/12V=~72A.
What am I missing?

[Sunking]

I am not going to give you answers, but I will tell you how to figure it out.

MPPT Controller Size in amps = Panel Wattage / Battery Voltage
Battery AH = 10 x Battery Charge Amps

Example if you have 800 watts of panels and run 12 volt battery.

800 / 12 = 66 Amps or a 65 amp minimum charge controller.

Battery = 600 to 700 AH.

[Withalligators]

Hey folks,

Sprinter build is getting started. I can source some 215w sunpower panels (but I'd totally go for some 345/360/370w if anyone has a source for Sunpower modules). With a custom racking system, I can squeeze 4 of them up there. Panels are a few years old, but specs are:

SPR-215-WHT-U

Peak Power 215W

Voltage 39.8V

5.4A current

Open Circuit Voltage 48.3V

Short Circuit Current 5.8A

My draws are as follows:

An ARB 47q running as a fridge

An Engel 84q running as a freezer as soon as the new models come out

A Maxair fan, and another as-of-yet-undetermined fan for air circulation

Occasional night time use of a 40" TV

Occasional night time use of a kinda thirsty (250-300w or so) gaming laptop

Onboard compressor

Device charging

interior lighting

microwave and possible AC use, but with a generator running.

So, My questions are as follows:

How big of an AGM bank can I get? Lithium still doesn't seem worth it right now. Especially after dropping so much dough on the sprinter.

What controller or controllers should I use? My last rig had a single 310w panel so that was easy. I would like a controller that is good and can do lithium chemistry in the future when I upgrade battery banks. I have a midnite solar classic kid and it's...weird. A controller that allows extra current to go to an accessory would be nice, but not necessary.

What's a good battery monitor? I've heard that Victron monitors are good. I still haven't got the whiz bang jr working for the Midnite Solar, and it's kind of annoying.

I'll probably use a Samlex ACR-160 between the bank and the starter, unless you guys think it's putting too much strain on my stock alternator. What would be a good alternative? A DC-DC charger? Open to any suggestions here.

Do you guys think it's overkill on the modules? I was shooting for a lot of input so I could potentially run AC during the day, but that seems kind of impossible, so minus that, do I need 860, would I be OK with 645? I had 310W on my old rig, and it couldn't keep up with my laptop and freezer running in the summer (though the freezer was a fairly inefficient Whynter 85qt) It also felt like my bank (2x 225AH Crown 6V batteries) dipped in voltage kinda quickly when the sun was down and I was running the laptop.

Cheers,

Alex