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ok, help me economically wire from the Inverter to Main Breaker (Grid Tie)

PoPoShoo

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Feb 3, 2022
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the Total run is 275'. 100' would be inside a metal building and the remaining 175' would be underground. It's determined that we need 2 ga. aluminum cable.
So...we'd have 2 load wires, 1 neutral wire and 1 ground wire.

Per codes (or lack of codes in our rural area), we could run wire w/out conduit inside the building. Would romex type work?

Outside, we'd bury the wiring. Could go with direct bury or run wire in a conduit.

So...could we use 2 different systems (inside wiring + outside wiring)? What's the most economical way to achieve all of this?
 
I would run 1.5" conduit, the entire way. PVC underground and EMT inside of the metal building.
And pull #3 copper for the hots and neutral. With a #6 copper for the ground. I understand why you want to save money, with aluminum. But, this way will last a lifetime.
Sticking with saving money.
Direct burial and SER cable.
Use a junction box to connect the two together.
 
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the Total run is 275'. 100' would be inside a metal building and the remaining 175' would be underground. It's determined that we need 2 ga. aluminum cable.
So...we'd have 2 load wires, 1 neutral wire and 1 ground wire.

Per codes (or lack of codes in our rural area), we could run wire w/out conduit inside the building. Would romex type work?

Outside, we'd bury the wiring. Could go with direct bury or run wire in a conduit.

So...could we use 2 different systems (inside wiring + outside wiring)? What's the most economical way to achieve all of this?
 
So...my calculations show that I can get away with using a 2-2-4-6 cable system (2 ga hots, 4 ga neutral and 6 ga ground)

Does this sound correct?
 
It appears 2 AL is too small. Use this https://lexproducts.com/technical/voltage-drop-calculator calculator or others like Southwire's. Stay below 3 percent voltage drop. Sometimes it is cheaper to use a next larger size wire because it's more common. They have pre-make four conductor USE type for wiring mobile homes, that is twisted a bit like triplex. The neutral and the ground are properly colored. Don't recall the sizes.
 
Folk, I appreciate the help BUT...i wasn't very clear, this is for a Grid-Tie system and the 275' of wiring from the Inverter will be A/C. Some of the calc. links were for "DC"

So...using an A/C Voltage drop calculator: 275' run, 240v, 47.5 amp output and 2-2-2-4 cable, my voltage drop is 1.5%
Does this sound correct?

If we dropped down to 4 ga alum wire, our voltage drop is an acceptable 2.9%
 
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