At that point, we were discussing liquidtight Flxible MC. The run from the roof to where it goes into the structure is 10ft. Four feet on the roof and about another 4 feet down the wall.
I have seen installations where the PV wire is run into a junction box somewhere next to the solar panel rails, transitioned to THHN, and from that point on in conduit into the structure. Instead, could I run my PV wire into a junction box to collect them all and send them out via conduit into...
The EG4 18kv will live In the carport, 170 feet away from the critical loads panel it will feed. The subpanel will have a 70-amp (80-amp if possible) main breaker. Do I need #2AWG or would #4 AWG for the approx 170tf run? A bit confused on whether the max voltage drop of 3% is for continuous only.
On the voltage side, we are humming along at about 332V, calculating the temp coefficient 358V. Specs are 230 - 500-volt. The nominal MPPT tracker voltage is 360V
Okay, now I am in over my head. No, I did not consider this, and I am not sure how to factor that in. Here is my best shot
Isc=Is×Derating Factor
Assuming Is is 14 amps:
Isc=14 A×1.56Isc=14A×1.56
Isc=21.84
Assuming this is correct, and now I am .84 out of spec, what are my options? Run...
Thank you for your reply.
The MPPT input 1 on the 18k recommends 25 amps, and a max short circuit input current of 34 amps. Should I reconsider supplying 2 strings in parallel? The current installation is roof mounted with approx 5-inch space between the roof and panel, it is a...
Okay, I think I will process all this information as I sleep. One last thing, in your initial comment you mention a condition, "when wet." I am not sure how that fits, can you elaborate? Here, wet weather happens in cool months, and roof temps are not hot. It's fair to say that I have not taken...
At the moment the plan is if after collecting data, input 1 cannot be paralleled, I will be adding panels as you suggested to open the 3rd input for further expansion.
Can you elaborate on the shade/blocking? I understand that there will be minimal gain from the backside considering they are sitting close to the roof, but I did not consider how that would impact the front. The roof is exposed to full sun no shade, I went with Tigo RSDs and not optimizers...
Could Liquidtight Flexible Metal Conduit be used throughout the installation? There seems to be some discrepancy as to whether MC Cable can be run exposed to the weather.
There are 3 strings in series any junction box on the roof would transition from PV wire to THHN, into the structure and through individual DC disconnects. Two of the arrays will be paralleled at input 1 of the inverter, EG4 18K.
Thank you for your input. I was planning on running the PV wire into a NEMA 4 junction box to make the transition to THHN. The IMO disconnects are located as soon as the wires come into the structure. The run from the roof to the point where they enter the structure is about 15ft. Everything...
The worst-case scenario brings me within 19 volts of max. What is the consensus?
Total string OC voltage: 450.09
Nominal maximum power: : 4050
Worst case temperature: -1.1
Temperature coefficient (Voc): -0.27
Temperature coefficient (Pmax): -0.34
For these, your:
Total worst case...
No permit, however I am doing everything to meet code. Is MC cable rated for outdoor runs? for example, junction box on roof to the interior of the structure.
Would this MC Cable meet NEC guidelines to run on the roof and into the structure?
Parking Deck/Lot Cable - Interlocked Galvanized Steel Armor w/ Overall PVC Jacket - Type MC
Standards, References, & Ratings
▲UL 66, 83, 1569, 1581, 2556, File Number: E80042
▲PROP65 - Warning use caution and...
I am a bit lost with the difference between the DC input range and the full-power MPPT voltage range. If I understand, the 18Kpv can support intake voltage from an array up to 600 volts.