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Solar Energy

Discussion in 'Off grid power' started by Meerkat, Dec 3, 2017.

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  1. Jan 18, 2020 #61

    Meerkat

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    @Bacpacker ,start at 8 mins into video last 3 mins to save time. Very interesting.
     
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  2. Jan 18, 2020 #62

    Supervisor42

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    Nice of them to do 'real-world' tests showing how only an 8" x 8" shadow can completely knock out the output.
    Also nice of a pesky cloud to show up while they were filming.;)
    I had 2 small panels in the back yard under test for 2 years.
    The mockingbird adopted them as his favorite place to perch.
    While he sat up there and 'mocked' me (pun:D) I'd watch the charge current drop to zero.
    ...and then there was the bird-poop:(. You'd think the rain would wash it off, right?
    Not if it gets baked in place with the hot summer sun firstgaah brickwall100.gif
     
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  3. Jan 18, 2020 #63

    Bacpacker

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    Keeping panels clean is a big deal. Even a layer of dust from a dirt or gravel road will lower the output.
     
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  4. Jan 18, 2020 #64

    Supervisor42

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    Exactly what my tests showed.
    Everybody brags about how great they work right after they get a system installed new.
    A year later, not so much.
    People spend $30,000 and cover one whole side of their roof with panels and then realize they have no way to get up there and clean them. (no, you can't walk on them:()
    Planning is everything.
     
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  5. Jan 18, 2020 #65

    Meerkat

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    SuperV tha was surprising ,huh? But this couple had solar on theri motohome for several years and for some reason didn't have as much a problem.:dunno:.
    I guees that Mocking Bird is like the bear.Ours does it too and tried to beat up the birds in the window of the van. And he loves our holly tree berries, the thug attacks everything that gets near that tree.
     
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  6. Jan 18, 2020 #66

    Bacpacker

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    The 30 panels we put up at work last year get cleaned every 6 months. I set regular PM's up on them as they were installed.
     
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  7. Jan 18, 2020 #67

    Meerkat

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    Thats a lot of panels to clean.
     
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  8. Jan 18, 2020 #68

    Bacpacker

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    Not quit 3 per month. We also check the batteries and all the electronics at each station. Panels are about 3'x5'
     
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  9. Jan 18, 2020 #69

    Meerkat

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    Oh ok. Our panels are 3X5 290W each..
     
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  10. Jan 19, 2020 #70

    viking

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    I think I mentioned this before, but the reason I did series was for the higher voltage to make up for any line voltage drop for the distance from the array to the battery shed, by paralleling the four series panels it gave me a good amount of amperage for taking care of heavy duty battery charging. This solar backup system has been put to the test the past few days as with the snow that we had, the power has been knocked out a number of times. Our friends down the road told me that when they went to town, there were big branches down everywhere as well as trees, the snow wasn't but about 4" but it was heavy. The power company and phone company has been very busy and I heard that at the peak there was over 19,000 homes without electrical power and because there are so many back roads around there are still a lot of homes without electricity. In hearing about all the places people can go for food and warmth, I get the feeling that even though a large amount of people live in rural areas, they are just not prepared, so if you are, be grateful that you've learned how to be prepared.
     
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  11. Jan 19, 2020 #71

    Meerkat

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    Viking I had lots of help from peopel like you on the P.S. site we came from to here. I forget all the names but your one I remember who helped us get our solar package together.:Thankyou::thumbs:
     
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  12. Jan 19, 2020 #72

    SheepDog

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    So they only tested the amps in both tests. I would have wanted voltage tests too because your power is voltage times the amps, The amps will be higher in parallel but the voltage will always be higher in series. The charge controller will work better with yoltage as it will convert higher voltage to more amps if it is higher than battery voltage.
    I don't think they completed the test.
     
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  13. Jan 19, 2020 #73

    Supervisor42

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    They completed enough of the tests to realize just the shadow from their sail boom on one of the panels was enough to reduce their charge power into the battery to effectively zero.:eek:
    If they had blocking diodes between panels in parallel, they would still have 50% power even if one of the 2 panels had shadow on it.
    But they didn't. They had them hardwired each way.
    They were counting on the internal diodes in the panels and it don't work that way.:rolleyes:
     
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  14. Jan 21, 2020 #74

    viking

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    I know a lot of things, but master very few Neighbor HCL Supporter

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    Actually, there is a lot of things to consider before even starting a solar project, like I mentioned before, when we were wanting a solar system for our motorhome I asked a lot of questions even after doing my own research, AM Solar of Eugene, Oregon gratefully gave me the info I needed to have a very good system on the motorhome, as well as designing and building the backup solar system for our home and that's why I try to pass on what I have learned. Our solar system, so far, has done everything I wanted it to do, this past week we've had many power outages, some that lasted all night into the next day and during these outages it ran two good sized refrigerators, one small and one large chest freezer, 200 watt slow cooker for 5-6 hours, LED lights, a flat screen TV and DVD player. Of course, if things went SHTF level, we wouldn't be running a lot of extras because we would want to have the batteries kept above 50% charge so that the following day the system could top off the charge or if the sun's totally clouded there will still be enough power for small things.
     
  15. Jan 21, 2020 #75

    Meerkat

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    Yea SuperV ,whatever that means:D. :lil guy::thumbs:
     
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  16. Jan 22, 2020 #76

    viking

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    Solar panel internal diodes are generally in all solar panels, the diodes protect the panels from back feeding electricity generated by other panels in an array, like when one or more panels are shaded, those would be protected by diodes. Diodes stop the flow of electricity in a reverse direction, that's not to say that current can't flow the opposite direction because it can if reverse current voltage limits are exceeded, I've seen parasitic battery discharge from alternators where their diodes may have been faulty, that's why it's not a bad idea to disconnect a battery in a car or truck if you don't use it frequently, some newer vehicles don't take kindly to having power disconnected to their computers so a trickle charger is often a good thing to be using, instead of disconnecting the battery. This electronic age we live in can present a lot of tricky situations, that's why I tend to like the older not so high tech cars, trucks and appliances. I don't have computer screens in our vehicles, I barely tolerate the computer I'm using right now, actually I hate the dang thing and will probably never own a touch screen model again.
     
    Last edited: Jan 22, 2020
  17. Jan 22, 2020 #77

    SheepDog

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    The cells in a solar array are just diodes. Large surface area diodes but electrically the same. They do put protection diodes in series with a back voltage (reverse polarity protection) of at least 200 VDC. but each diode has a voltage drop of 1/2 volt which is roughly the same as the output from one cell. Put too many "protection" diodes and you diminish the output. I have used glass covered diodes as light detectors and to power "hot' mics and "hot" receiver circuits. The drawback is that while a single diode produces about 1/2 volt they produce only about 1-5 mA (.001 to .005 amps) in the brightest sun.
     
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  18. Feb 4, 2020 #78

    Meerkat

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    More proof women aren't wired like men. o_O
     
  19. Feb 6, 2020 #79

    viking

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    While it can be confusing at times, it's probably a very good thing.
     
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  20. Feb 6, 2020 #80

    Meerkat

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    Since this is coming from a Martian than I'll agree., :thumbs:" Women are from Venince ,men are from Mars".:I agree:.:D
     
  21. Feb 6, 2020 #81

    viking

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    What's interesting is that I didn't have to read that book to know what it was all about, yeah I have to deal with that difference on a daily basis, you'd think I'd have learned better by now, but sometimes it's like walking through a mine field. I am a Martian, I'm not sure there is an AAA to take care of that.
     
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  22. Feb 6, 2020 #82

    SheepDog

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    Wow! you mean men and women think differently?
    First women think in parallel and men think in serial.
    Men rarely take things said as a personal remark and women tend to personalize what they hear.
    Women freely admit that they operate on an emotional response and men go to great lengths to hide that by finding reasons for their decisions. (humans are emotional beings)
    Men, generally, do little to understand themselves or others - they just accept or dismiss. Women, generally, spend their lives working to understand their own feelings and those of others.
    Tell a man that he looks like he may have gained a little weight and it just means that his pants fit tighter.
    Tell a woman that she looks like she may have gained a little weight and she feels like you just said she was fat.
    Feelings matter but more for women than men.
     
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