30 kw Grid Tie System

I have been doing some research and calculating our monthly consumption of electricity. I am wanting to offset 100% of my electric bill, but being tied into the grid. I am needing approximately 3500 kwh/month. From my understanding a 30-35kw solar array should be sufficent. I am using Trina Solar TSM-325PEG14 (325W) panels as I can get them for $0.38/watt (I work at a solar distribution facility). I am also wanting to use the Enphae IQ7+ microinverters.
My biggest question is, what would the wiring set up be, do I need a combiner box? What combiner box is needed and how will I tie it into the panel correctly?
Kind of loaded questions, but I am fully aware of the smaller array's involving the microinverters, but not the larger systems. My reasoning for using Enphase is because of the support and GUI for monitoring everything is super clean.
Any thoughts would be great.
My biggest question is, what would the wiring set up be, do I need a combiner box? What combiner box is needed and how will I tie it into the panel correctly?
Kind of loaded questions, but I am fully aware of the smaller array's involving the microinverters, but not the larger systems. My reasoning for using Enphase is because of the support and GUI for monitoring everything is super clean.
Any thoughts would be great.
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You may require a much larger service drop from your utility for what you propose.
Before that their permission should be looked into.
A downside of micros, is going up on the roof for repairs. They have had more than a normal amount of failures from the guys I work with who do grid installations. Much easier with a central inverter in the garage. They also have excellent monitoring! The other downside of micros is you will be up on a roof lifting panels.
My business is Offgrid and the last thing we want is electronics out in the sun or shade. The only plus for micros to me is if you have shading. We do not have that offgrid! If we do, we deal with it by taking down the tree or building the array far from the home.
This long distance is the same concept you should consider. I mean, the way we do this is high voltage strings that a grid tie inverter would give you. No combiner required and far easier to wire. Some grid inverters have 3 mppts and each can have 2 long strings of panels without combiners.
Good Luck!
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Second call should be for an energy audit, because something is way out of line for a standard house with 2 adults and 4 kids
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.
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If I did have to have a large array, 60-70+ of the 325W panels I have access to, what items would I need to keep in mind if I wanted to be grid tie and use microinverters? Is there a combiner box I need to be aware of or?
Unless you have massive shade you cannot avoid, micros are a second tier choice.
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
With doing so on the micro inverters, what combiner box would be compatible with such a system? I am projecting to have 96 panels.
You will need something like a 200A main house panel, filled with breakers, and each home run goes to it's own breaker. Make sure your panel has enough breaker slots for your micro arrays.
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,