Best modules for use in low light

lowlightlowlight Registered Users Posts: 4
The site is on a South facing hill (New Zealand, 38 degrees South) and is surrounded by trees. So little direct sunlight in winter. Apparently thin film amorphous silicon and CIGS modules do better in these conditions. Any comments or links regarding this?


  • mike95490mike95490 Solar Expert Posts: 9,320 ✭✭✭✭✭
    Yes, they do better.   But not nearly enough to make you happy.  And they have a short panel lifetime ( 5 years)

    If you are not able yo place your panels in a sunny spot, they will only produce about 5-10% of their nameplate rating.
    Amorphous silicon and CIGS might give you 10-15%.  a 5% improvement is not very much.

    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    gen: ,

  • BB.BB. Super Moderators, Administrators Posts: 31,875 admin
    Solar panels, to be "useful", need direct sunlight.

    Is there any way you can access direct sun with a "remote" mounted array (run a cable 100+ meters back to your place)?

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • Dave AngeliniDave Angelini Solar Expert Posts: 5,983 ✭✭✭✭✭
    Solar can also be useful if there is alot of it! Probably 4 times or more of what would be normal. This is not that hard to do if you have the space. I do this for a few of my clients. Ends up around 8kw of panels, or more!

     If space is an issue, it will cost you even more as you will have to use high efficiency panels which can be 2 X  the price.

    Cut the trees and do it in a way that protects from fire. Build a firebreak that is good for you and others for a fire. We have plenty of wildfires much farther from the equator than you are. Agree with the 2 previous posts!

    Hard to do anything if the hill is the problem in winter! Get to the top of it!   Good Luck!
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
    E-mail [email protected]

  • NANOcontrolNANOcontrol Registered Users Posts: 200 ✭✭✭
    I have extreme shade and overcast at my site.  I run 3,000W of panels into a 500W controller.  I wish it were better, but it suits my needs perfectly.  Adding reflected light could be a possibility like placing near a white wall or building.
  • Dave AngeliniDave Angelini Solar Expert Posts: 5,983 ✭✭✭✭✭
    Bifacial from Canadian Solar. Many of my installer buds are using them. Not to mention, they are just beautiful sitting underneath them.

    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
    E-mail [email protected]

  • lowlightlowlight Registered Users Posts: 4
    Thanks for the input. Because it is a covenanted bush block, I can't cut the trees down. Will get some good sunlight in summer, but very little in winter. May be able to combine solar with wind. The wind blows at night and during winter, so would make sense. The wind turbine would have to be at the end of very tall pole, though.

    Any of you tried this?
  • Dave AngeliniDave Angelini Solar Expert Posts: 5,983 ✭✭✭✭✭
    Very few places are actually good for wind. People think it is good until they measure it. I have clients up in the high country above where I live that have used wind. The problem and the reason most have abandoned it, is high wind. The secondary reason is the companies who make wind gens do not stay in business long. I would say 90% get wind damage to the turbine, can't get a replacement, or do not have access anymore to the guy who went up the tower. You can look in the marine world or at some of the cheap and poorly made gear on amazon. That might be a way to test if there really is any meaningful power in your winds. A genset probably is the way to go for you.
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
    E-mail [email protected]

  • clockmanfranclockmanfran Registered Users Posts: 84 ✭✭✭
    edited July 4 #9
    Hi Lowlight, 

    We are a Independent non commercial Sustainability & Renewable Energy Project, and been doing the research and development for over 20 years now.   And NO we do not just throw money at this stuff, and if necessary we will re-invent the wheel if it works out more cost effective.   Our Mantra ........ Keep it Simple, Make it Robust, and keep it Cost Effective.

    Amorphous silicone panels, I tested these with some Monos and Polys and in 2006 the amorphous silicone panels were very much better in ambient light conditions. However, over the past 10 years or so Monocrystalline manufacturers have got better and more efficient in the manufacturing process for output in ambient light conditions. 

    Our PV collection started in 1987, with amorphous silicon, in fact i still have them up and operating at just 400 watts max output.  If i replace them with the same modern Monocrystalline panels, then for the same surface area i will get a good 1100 watts. Yep technology and quality have sure moved on and the real PV prices have fallen sharply.

    With the latest LONGI 120 cell split panels giving a good 20% of there rated 380w output in just ambient light.   In winter and rainy days this all adds up.   LONGI panels are made in China as are most of the PV panels, and i can obtain the New 380 watt panels at about $130 each. 

    We now have 63 Big Mono PV panels, from Panasonic, Sharpe, German manufactured SolarWorld PV, etc, down to a couple of bottom quality KNIVE. panels. 

    Wind Turbines, We have 3off 4m (12 footers) diameter made by us to the Hugh Piggott design, these went up in 2008.  Every year they need servicing and blades re-balancing, so i have to give a complete week for all 3.    Material cost for one is now about $1500 for a TRUE RATED output of 1kW.   When asked I now say, "DONT BOTHER with domestic wind turbines as PV is way more cost effective, and they just sit there with no moving parts"

    I will keep my 3 flying as long as possible, as I say to folk "Its a very visual Statement". 

    PHOTO ....... 2007 Mrs with a set of our carved blades.

    Everything is possible, just give me Time.

    The OzInverter man. Normandy France.

    3off Hugh P's 3.7m dia wind turbines, (12 years running).  ... 5kW PV on 3 Trackers, (8 years) .... 11kW PV AC coupled using Used/second hand GTI's, on my OzInverter created Grid, and back charging with the AC Coupling and OzInverter to my 48v 1300ah batteries. 

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