10-31-17, 10:01 PM | #71 |
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No actual test so far for the system but i got 22 of the 230 watt pannels . Max of 5060/240
22 amps maybe . Dont know if it would ever excede this being i havent put any on the roof . I know 10guage is good for 30 amps . 8 guage is for 40. Distance playing into it i figure i would rather not loose as much through heating up wires over distance to shop to house. I already have pv 10 guage 200ft this should be enough to get me to the inverter. |
11-01-17, 05:57 AM | #72 |
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Efficiency is the ratio of input power to output power. Higher voltages allow the benefit of finer wire sizes for the same power but we could run larger wire at lower voltages and achieve the same efficiency, cost no object.
AC inverters like the SolarEdge I use run about 350 VDC from modules in series so finer wire can be used with a very high efficiency. I mount mine in the garage, I agree, very noisy! Rob |
11-01-17, 10:50 AM | #73 | |
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That puts a whole new spin on wiring these panels ! 240v DC who knew (not me)
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11-01-17, 04:21 PM | #74 | |
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11-01-17, 04:25 PM | #75 | |
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11-04-17, 06:42 AM | #76 |
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Roof conduit
So for roofing conduit . Is there any code or anything that says that the conduit must be a certain type . And from row to row do you run it on the panel or do you run that through conduit down. Does anyone have any pics of the portion before panels are put down ?
Im trying to get a rough idea of what i need to do to get ever thing right. Already have some 1 inch conduit i can use for the wall of the house . Just ant sure what to use for the roof portion and where needs to have the conduit and type |
11-04-17, 05:37 PM | #77 | |
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In my case, when I needed to transition cable types on the roof, I went through a Hoffman fiberglass enclosure with UL Listed industrial wire terminals. When my inspectors looked at the connection boxes and didn't find wire nuts, they were impressed by the fact that it looks like it fell out of some industrial installation. When I transitioned from stranded 12AWG trunk cable to the solid 10/3+G UF wire in the attic, I went through more industrial wire terminals inside a PVC junction box. |
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11-04-17, 09:45 PM | #78 | |
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11-05-17, 08:18 PM | #79 |
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Voltage Drop in PV Systems: Page 2 of 3 | SolarPro Magazine
Found this to be kinda helpful. Seems for a long haul emt will be the most reliable . Still so far i have not found squat on what i am trying to find out on how i need to run my dc from the last optomizer to the spot where i am going to go off of the roof . My only guess is under the panel just put the wire through it and mount the emt a little bit off the roof so it dont touch and hold trash. |
11-06-17, 12:03 PM | #80 | |
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The amount of voltage looks like this is perfect scenario . 240 volts output Ac. 350 v input dc according to solar edge . I have 22 230 watt panels. \ So 14.4571 amps dc 15-20 amps would be a theroretical max . To my understanding this almost never happens to pull a max power. Im reading this Code-Compliant Conductor Sizing | SolarPro Magazine And its saying artical 701.1b and things as this instead of plain english and using common sense for most of it . Seems like if im thinking right that if i ran dc to the house to the meter it would be more efficient with the wire 1 due to voltage. The mppt im not really fully understanding . But 350 volts is whats needed to turn on the inverter if i used a 10-8guage wire i should be fine . With wiring ive always assumed bigger was better. I ran a simulation for a voltage drop with 350 volts . This was its results . ------------------------------------------------------------------------------------- 1 conductors per phase utilizing a #8 Copper conductor will limit the voltage drop to 0.89% or less when supplying 15.0 amps for 150 feet on a 350 volt system. For Engineering Information Only: 40.0 Amps Rated ampacity of selected conductor 0.7421 Ohms Resistance (Ohms per 1000 feet) 0.052 Ohms Reactance (Ohms per 1000 feet) 3.5 volts maximum allowable voltage drop at 1% 3.108. Actual voltage drop loss at 0.89% for the circuit 0.9 Power Factor |
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