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  1. Thread: Need ideas

    by BillK-AZ
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    3$$
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    193

    The Walmarts in Arizona are carrying a nifty...

    The Walmarts in Arizona are carrying a nifty white LED light that is about 4" x 6", draws about 150ma, costs about $15 and will light your stalls to a reasonable level. I have used these for restroom...
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    1,146

    Many telecommunications systems use a -48V...

    Many telecommunications systems use a -48V (positive is grounded), but the Morningstar controllers are for a negative ground system. It is possible to isolate the array and controller and then...
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    Arizona Utility Policies

    The Arizona Solar Center has two recent articles on this subject as regards Arizona utilities.

    Arizona Electric Utility Information :...
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    Photos of the old modules

    Photos of the old modules
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    2,381

    Here is some long term experience in Scottsdale...

    Here is some long term experience in Scottsdale AZ:

    1995: Installed a PV system with 40 ea 75W Siemens (ex Arco Solar) modules (3000W) with two Trace SW4024 inverters with batteries, but utility...
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    2,199

    Some calculations of PV system performance

    Seems that the real world situation is far from the understanding of the AHJ. A PV system installed at a tilt of 25°, facing South, will provide more output, about 20% more, at 5pm in the summer...
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    21981 Sort of like this photo from an article in...

    21981
    Sort of like this photo from an article in the Economist (British magazine)? Kind of hard to understand code compliance if this photo is of a US installation. Seems plenty of gap to allow...
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    The primary function of bypass diodes is to...

    The primary function of bypass diodes is to protect against hot spots that can occur with shaded cells. The secondary function is to allow current to bypass an open circuited or low current string...
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    With SolarEdge you have series strings of...

    With SolarEdge you have series strings of Optimizers, not series strings of PV modules.

    The SE9KUS has two DC inputs on a terminal strip (the two input strings are parallel connected at the input...
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    1,123

    You can use the Fronius tools:...

    You can use the Fronius tools:
    https://www.fronius.com/en/photovoltaics/products/commercial/solutions/fronius-service-solutions/configuration/fronius-solar-configurator-4-0
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    677

    PV Conduit Labels - Blowing away

    Is anyone else having a problem with "Warning - Photovoltaic Power Source" labels required by 690.31(G)(3) failing to adhere after a few years?

    Three years ago these tape style labels were applied...
  12. Magnum Energy PT-100 features both electronic...

    Magnum Energy PT-100 features both electronic GFDI and AFCI
  13. The Morningstar DC Ground-Fault Protection...

    The Morningstar DC Ground-Fault Protection Devices look like they will work for your situation.

    These two GFPD devices from Morningstar Corp. have more advanced safety features than the...
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    867

    see:...

    see: https://www.solaredge.com/sites/default/files/se_3p_system_design_and_nec.pdf

    wherein on page 5
    Over Current Devices The SolarEdge power optimizers include automatic reverse current...
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    Friends with contacts at Eaton finally got an...

    Friends with contacts at Eaton finally got an answer.
    This is a 200 amp style device CG32M2S24 manufactured in Lincoln, IL during 1994 based on the date code label F450=
    The original UL File...
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    20266

    20266
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    I am dealing with a similar problem. ...

    I am dealing with a similar problem. Approximately 1995 C-H center fed main all-in-one panel without any label except a UL sticker that according to C-H (now Eaton) technical support does not trace...
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    674

    Look at the Fronius Symo 12.0-3 208-240...

    Look at the Fronius Symo 12.0-3 208-240 inverter. Use two and an AC combiner for 24 KW. There is also the Fronius Symo 15.0-3 208, but it has a more limited DC voltage range and a single...
  19. Arc Fault Detection Module

    If your inverter has a suitable control input, you may be able to use one of these Arc Fault Detection Modules
    http://www.dcsunvolt.com/ArcFaultDetectionModule.shtml

    This is detection only, one...
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    As manufacturers improve the solar cells, the...

    As manufacturers improve the solar cells, the fill factor (ratio of maximum power to the product of Voc x Isc) gets higher. This means that at operating voltages higher than Vmp the current (and...
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    The utilities have a rather expensive software...

    The utilities have a rather expensive software package for these calculations. When I had this challenge several years ago I asked the serving utility, Arizona Public Service (APS) if I could...
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    [QUOTE=ggunn;1881955] There is no power flow...

    There is no power flow at night, but there may be current flow due to the filter capacitors in the inverter. I monitor many PV systems with data acquisition using separate power meters and they...
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    The system descriptions seem to indicate: ...

    The system descriptions seem to indicate:

    Utility service is 277/480/3-ph
    Generator is 277/480/3-ph
    Transfer switch is 277/480/3-ph
    MDP is 277/480/3-ph
    Transformers on many loads and...
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    6$$
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    969

    A detailed study in 2011 of an older (1986) 192...

    A detailed study in 2011 of an older (1986) 192 kW, two row, array in Phoenix showed major differences between the rows. Basically, the rear row, close to a fence, operated about 2°C warmer and...
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    1,046

    Check your 90A and 50A breakers, they should be...

    Check your 90A and 50A breakers, they should be listed for service disconnect. You are not likely to find tandem 50A service listed breakers.

    Since each breaker is a Service, your PV 20A can be...
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