RV system - type and location of combiner box?

Exactly what panels do you want to use? Have you looked at larger >200 Watt Vmp~30 volt panels (used for GT Inverters)--They will work nicely with a your Classic controller.

What size battery bank (voltage and AH rating)?

-Bill

Where to put the combiner is your choice... The wiring costs will be about the same (6x 10 AWG wires vs 1 x 4 AWG set--Same amount of copper).

The actual wiring, number of circuits, awg, etc. depends on how you series/parallel connect the panels. For a 12 volt battery bank, 2-3 of your 100 Watt (Vmp~18 volts) in series, then combine those in parallel (at the box) will be more efficient for your Classic.

You can run your panels in series up to Vmp-array~100 VDC (check Classic String Controller, your local temperature to be sure) if it makes wiring better for you (classic will run a bit hotter, higher voltages into MPPT controller has more losses).

If you have 6 panels, and they are Vmp~18 volts--Your ideal mix would be 3s x 2p or 2s x 3p. The advantage of 3s x 2p is that you really do not need a combiner box... For three (barely) and more parallel strings, you need the combiner box to reduce the chances of fire if one panel is shorted and fed by the other parallel strings.

Many people still like a switch (on combined strings) to turn off the controller for service. Or you still put a 2x combiner box with breakers in so you can turn off one string and see if it is carrying is share of current (easier/quicker debugging).

To get exact answers, need to know the Vmp/Imp of the panels and how many you will use. Note that >200 Watt panels (Vmp~30 volts) are cheaper (about 1/2 the price) of typical 1xx watt panels. And less wiring too.

But you have to make do with the space and hardware available.

-Bill

Sorry--16 gives you the option of 2s x 8p; 4s x 4p (8s x 2p is too high of voltage for a Classic 150)... Either will work fine. 4x4 will be simpler wiring (fewer breakers) and allow you to use smaller awg wiring.

The Classic does have fans which can be noisy... Need to place near battery bank (short/heavy battery leads to low voltage drop) and good airflow. Having it near your work space (for example) in the RV may be distracting from the fans running during the day.

That is a good size array for a 12 volt battery bank(?). What AH rating will it be?

-Bill

You might want to look at larger (AH) batteries... I am not a big fan of lots of parallel strings of batteries--1 string of batteries is best (in my humble opinion), 2-3 parallel strings can work OK. More than that, I would suggest avoiding.

Trojan L16RE-2V 1110 AH 2-Volt Deep Cycle Battery $353.00 each

Trojan, as I understand, actually has three cells (three caps) in parallel--Not ideal (I would prefer one cell)--But to give you an idea. 6 of these batteries in series would be your bank (and like 5x parallel 6 volt GT batteries. (note: weight of lead will be about the same--no matter the configuration--I.e. a 12 volt @ 1,200 AH battery weighs about same if a bunch of small GC batteries or single string of large AH batteries).

The next question I would ask you--At that size of battery bank, I would be suggesting a 24 volt (or 48 volt) battery bank. Fewer parallel battery strings and smaller awg wiring (24 volts is 1/2 the current; 48 volts is 1/4 the current of a 12 volt battery bank). More or less, I would suggest any battery bank >800 AH should look at the next higher voltage battery bus (12 volts @ 800 AH to 24 volts @ 400 AH--as an example).

And with that much weight--Perhaps look at LiFePO4 (version of Li Ion chemistry). Smaller and lighter weight.

-Bill