Series or Parallel 9 panels on a pole mount

[Ampster]

[QUOTE=littleharbor2;n439670]

That's a 125V limit.
......,. Being a PWM type controller you want to wire your panels in a 12, 24 or 48 volt nominal voltage configuration.

If it were me, I would do some scenarios to see where the tradeoff would be to buy a MPPT controller that could run a higher voltage so I could use smaller wire on those long runs. The saving in wire might pay for a new controller. If I recall, MPPT controllers are more efficient than PWM type controllers?

[littleharbor2]

MPPT, watts in = watts out, minus a few percent.
PWM, x amps in @ any voltage = x amps out @ battery voltage. The bigger the voltage differential the more loss of efficiency.

[jflorey2]

If I recall, MPPT controllers are more efficient than PWM type controllers?

In most cases, yes.

[Sean Montana]

Just want to say you're all good people for helping others out! And not making them feel dumb because their learning. THANK YOU : )

[sdold]

Q: Biggest question is can we use 10awg thhn in conduit underground to run the 200ft to the system?

In the US, underground conduit is considered a wet location and you'd need something with a "W" (wet) like THHW. I think most THHN is dual-listed THHN and THHW anyway. Welcome to the forum!