Please could smebody check my wiring diagram

Neilthurston99 · Dec 14, 2023

Hello

I am building a set up to power grow lights at my allotment in my greenhouse. If anybody can give it a once over I would be very grateful. I have watched a lot of youtube videos and a lot of googling, but, I am a beginner and any advice would be appreciated indeed.

Instead of two seperate kill switcvhes, to save money I have gone with two circuit breakers which I hope will serve a dual purpose.

Issues that the reader might have could be over my choice of AWG as I get conflicting guides as to safe current capacity.

Cheers !

Madco · Dec 15, 2023

The basic ampacity required for your inverter is going to be 1000W/12v = 83A. Assuming a 90% inverter efficiency, the ampacity goes to 83/.9 = 93A. Apllying the NEC 1.25 conductor amapcity adjustment brings you to 93*1.25 = 116A.

If the inverter power wiring is to be in conduit, I would go with #2 AWG copper, not #4.

There is always a lot of discussion here as to wether to use "free air" or conduit based ampacity tables. In 30 years of designing these systems, I have only found a few where I could justify free air.

The lengths are short and there will be little cost difference between the #4 and the #2.

I realize you only expect to load the inverter to about 25% (250W) but your load will probably increase over time. I recommend designing the wiring so that it supports the full capacity of tour inverter.

Neilthurston99 · Dec 15, 2023

Madco said:
The basic ampacity required for your inverter is going to be 1000W/12v = 83A. Assuming a 90% inverter efficiency, the ampacity goes to 83/.9 = 93A. Apllying the NEC 1.25 conductor amapcity adjustment brings you to 93*1.25 = 116A.

If the inverter power wiring is to be in conduit, I would go with #2 AWG copper, not #4.

There is always a lot of discussion here as to wether to use "free air" or conduit based ampacity tables. In 30 years of designing these systems, I have only found a few where I could justify free air.

The lengths are short and there will be little cost difference between the #4 and the #2.

I realize you only expect to load the inverter to about 25% (250W) but your load will probably increase over time. I recommend designing the wiring so that it supports the full capacity of tour inverter.

Hello, Many thanks for taking the time to reply and sharing with me your pearls of wisdom.

I also have increased the size of the inline circuit breaker to be 150a.

Assuming your suggestions are introduced, does everything else look fine. As you can guess I am an absolute beginner with no electrical knowledge and only recently learned what a busbar was. A very steep learning curve...

Thanks again !

Madco · Dec 16, 2023

Yea, everything else looks fine. PM me when tou get closer to building it. There are a lot of "gotchas" that pop up and I will be happy to help out further.

Neilthurston99 · Dec 16, 2023

Madco said:
Yea, everything else looks fine. PM me when tou get closer to building it. There are a lot of "gotchas" that pop up and I will be happy to help out further.

You are a top bloke - just in the middle of buying everything so will be in touch

Madco · Dec 16, 2023

good deal! I'd be happy to review specs on what you are buying to be sure everything will happily integrate! Just let me know.

Please could smebody check my wiring diagram

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