Wiring recommendations??

[drumzz2109]

Soon I will be adding up to a 10 KW solar array to a brand new detached shop I have had built in my backyard. I will be running a 220' trench for my 100Amp direct burial cable within the same trench I will also run my PV cabling and security data cable.

My question is several parts.

First, do I need to separate the different cables within different layers of dirt to minimize any interferences? The trencher can go several feet down if needed.

Second, instead of running 2 very long PV cables from the array to existing invertor would there be any benefit or hindrance of running a single 2 conductor cable (through the same trench)?

Third, instead of running the long PV run to existing invertor (which I will be upgrading to accept larger array) would I benefit in any way by running a second invertor at the array and simply running the AC line to a combiner then back to the grid?

Any help is appreciated, And go

[SolarStone]

Enphase 215 used on Q Cell 250

This question, despite my calculations, is needing an answer to determine if the arrays being installed by my company are able to work even close to our promise. If we are using 215 enphanse micros with qcell 250's then the maximum efficiency should only be 80% of 215. I've been informed that its okay to use these together vs. going 1 to 1 on wattage. Also will this burn out the inverters? I have been told by every company i have worked for previously that you want to base your inverter around 80% as maximum capacity as to not fry the inverter. Is this correct and is it a big problem using the ratios that we are?

[Naptown]

This question, despite my calculations, is needing an answer to determine if the arrays being installed by my company are able to work even close to our promise. If we are using 215 enphanse micros with qcell 250's then the maximum efficiency should only be 80% of 215. I've been informed that its okay to use these together vs. going 1 to 1 on wattage. Also will this burn out the inverters? I have been told by every company i have worked for previously that you want to base your inverter around 80% as maximum capacity as to not fry the inverter. Is this correct and is it a big problem using the ratios that we are?

Please start a new thread as opposed to hijacking one on another topic
Copy and pass into a new thread as I can't move it at the moment
Thanks

[Naptown]

Soon I will be adding up to a 10 KW solar array to a brand new detached shop I have had built in my backyard. I will be running a 220' trench for my 100Amp direct burial cable within the same trench I will also run my PV cabling and security data cable.

My question is several parts.

First, do I need to separate the different cables within different layers of dirt to minimize any interferences? The trencher can go several feet down if needed.

Second, instead of running 2 very long PV cables from the array to existing invertor would there be any benefit or hindrance of running a single 2 conductor cable (through the same trench)?

Third, instead of running the long PV run to existing invertor (which I will be upgrading to accept larger array) would I benefit in any way by running a second invertor at the array and simply running the AC line to a combiner then back to the grid?

Any help is appreciated, And go

Attach it to the line side in the garage with the inverter there.
You may also have to do a line side tap at the house with a disconnect.
If you run DC and AC in the same trench I would suggest putting the DC in conduit and make the voltage back to the house as high as possible.

[drumzz2109]

Benefit?

Attach it to the line side in the garage with the inverter there.
You may also have to do a line side tap at the house with a disconnect.
If you run DC and AC in the same trench I would suggest putting the DC in conduit and make the voltage back to the house as high as possible.

Thanks for the recommendation. What is the benefit of your recommendation? I already have the disconnect and solar meter setup for all of my current solar output, that I sell directly back to the grid, at the residence.

[Jerry Liebler]

Thanks for the recommendation. What is the benefit of your recommendation? I already have the disconnect and solar meter setup for all of my current solar output, that I sell directly back to the grid, at the residence.

So you are adding 10KW on the shop. The simplest solution is: Don't upgrade the inverter you have now, just add a 9-10KW inverter and required DC disconnect in the shop and run a separate 10/3UF cable, in the trench, for the AC output of the added inverter and connect the added cable through a 20 amp breaker into your solar sub panel. Since there is only AC in the trench both circuits can even be in the same conduit.