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Thread: Solar happenings

  1. #891
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    Quote Originally Posted by Ampster View Post
    In my little city in Southern California, a 3 foot access is required for firemen fighting a house fire.
    They're just shingles; you can walk on them etc:


  2. #892
    Senior Member JRP3's Avatar
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    There may be some concern about hacking through live voltage to get through the roof while firefighting.

  3. #893
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    Quote Originally Posted by JRP3 View Post
    There may be some concern about hacking through live voltage to get through the roof while firefighting.
    Next Gen Solar PV equipment features what's known as 'rapid shutdown'; So far only Solar Edge and Micro-inverters have this but there's a push by the NEC to make it mandatory on all new equipment. The highest voltage you'll find on an array once AC power is removed from the home (already standard firefighting practice by pulling the meter) is <50vdc.

    http://www.solaredge.com/files/pdfs/...removal_na.pdf

  4. #894
    Senior Member lolachampcar's Avatar
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    I can not wait until all panels have built in micros removing the need/concern for this stuff. This would even keep the DC from being exposed. Probably wishful thinking given all the different AC grids that must be accommodated.
    P8911 ViN4288 85KW Silver Grey Obeche P85 21s Dual/Tech/Sound/Air Delivered 2/6/2013.
    P14936 Model S #2 14694 Red/Black/Black P85+ Dual Charger Solid Roof P+ 7/20 delivery.
    White/Tan S85 18201 ordered 7.26 delivered 9/2/12 (accident damage 12/12). Replacement White/Tan S85 delivered 3/5/14

  5. #895
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    Anyone going to this? U.S. Solar Market InsightGreentech Media

    [top]The U.S. Solar Market Insight Conference presents data, analysis and expert forecasting on the state of the solar market in the U.S. This is the only event exclusively underpinned by the Solar Market Insight report series produced by GTM Research and the Solar Energy Industries Association.

    - - - Updated - - -

    Well this is a good start for apartment living arrangements:

    panasonic-partners-with-powertree-services-to-build-68-ev-charging-stations

  6. #896
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    Quote Originally Posted by lolachampcar View Post
    I can not wait until all panels have built in micros removing the need/concern for this stuff. This would even keep the DC from being exposed. Probably wishful thinking given all the different AC grids that must be accommodated.
    There's really just two types of grids... 50 or 60 hz and there are already some inverters that can do both... I still think there's a place for string inverters and I'm actually more a fan of the 'solar edge' approach using DC optimizers for MPPT at the module level then a central inverter.

  7. #897
    Senior Member lolachampcar's Avatar
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    One data point of particular interest as it was my installation. I bought 31 ABB micros of which 11 had a Vac read problem whereby they were under reading the trunk line voltage by between 10 and 15 Vac. This kept the inverters from starting. In addition, there have been two infant mortality cases where the inverters lost visibility of the AC grid all together after having run for a week or so.
    P8911 ViN4288 85KW Silver Grey Obeche P85 21s Dual/Tech/Sound/Air Delivered 2/6/2013.
    P14936 Model S #2 14694 Red/Black/Black P85+ Dual Charger Solid Roof P+ 7/20 delivery.
    White/Tan S85 18201 ordered 7.26 delivered 9/2/12 (accident damage 12/12). Replacement White/Tan S85 delivered 3/5/14

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  9. #899
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    Quote Originally Posted by lolachampcar View Post
    I can not wait until all panels have built in micros removing the need/concern for this stuff. This would even keep the DC from being exposed. Probably wishful thinking given all the different AC grids that must be accommodated.
    That makes off-grid and battery backup situations that much harder.
    micro inverters help with shading issues, but I'd rather see some form of DC balancing handle that before sending to a centralized inverter which can be more efficient, and not cause any problems for off-grid and battery backup situations.

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