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Why 100 watts are not equal to 100 watts?

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  • #16
    Originally posted by Brian53713 View Post
    ...
    And not be argumentative but I have gotten 1800 watts out of 200 watts of panels ,One Day by moving the panels around manually....
    You mean you think you harvested 1,800 watt hours from 200 watts of panels in a day ? That's unbelievable, considering that would take 9 max (solar noon) production sun hours with panels held at 70F. Spill the beans, how did you do that?

    Powerfab top of pole PV mount (2) | 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

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister

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    • #17
      Ground mounted movable heavy contraption shown in my profile picture. Used to have two panels now 4. 2 Brand new 100 W Renogy panels. As an experiment left them facing North East for a.m. moved them numerous times during the day to run my small pool pump .2 DC fans. TV. Victron100/30MPPT.

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      • #18
        Was that measured or just taking the pumps rating. There are $10 wattmeters that are quite handy for this. Going back to laptops, I'm using mine right now with the wall wart powered directly from almost exactly 60V DC from the array. I can't advise anyone to do that, but higher array voltages are lovely. Go grid tie panels!

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        • #19
          Not sure if that last comment was directed at me, but the measurement of the wattage collected was off the Victron 100/30 Bluetooth dongle info storage

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          • #20
            Originally posted by Brian53713 View Post
            Ground mounted movable heavy contraption shown in my profile picture. Used to have two panels now 4. 2 Brand new 100 W Renogy panels. As an experiment left them facing North East for a.m. moved them numerous times during the day to run my small pool pump .2 DC fans. TV. Victron100/30MPPT.
            Wow. Do you move your array every day to track the sun or just on the days you run your pool pump?

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            • #21
              Like I tried to describe previous post, now that I have 400 watts I just can tip that ground on its leg back with some supports under it to go nearly flat and have other adjustment on the garage door track I used to build it raising it up and down seasonally before I tip it back with some treated lumber under the front of it. So no need to move it around anymore. It was Heavy ish, girlfriend could move it , but she's gone .replaced her with the smart camera, smart outlet to turn the pool pump off and on.

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              • #22
                Well this is how the story ended. Thanks for the input.

                I know ratings differ from real life, same for solar panels and even for lead acid batteries, but what I meant on the thread goes beyond ratings. In short you can't buy a 100W solar panel and use a 60W laptop, yes 40W are wasted even if you have full sunlight. The details are kind of tricky and related to the electronics, energy measurements and not so much to brands and lab conditions for the ratings, but now that I have full understanding I know how difficult it is to explain, that's why the videos I found on the web are long and still confusing people, it is confusing. Let's just say besides the tricky stuff, an inverter will steal just too much from your system. It's better to work with direct DC to DC converters, they are far more efficient.

                Here are the details of my recent setup, https://www.solarpaneltalk.com/forum...-other-details I'm getting exactly what I need (and more) from a cheap setup.

                Thanks for the input.

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                • #23
                  Originally posted by hroldan View Post
                  In short you can't buy a 100W solar panel and use a 60W laptop, yes 40W are wasted even if you have full sunlight.
                  Glad it's working for you and thanks for the update, most folks never come back to tell us how it worked out.

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                  • #24
                    Originally posted by sdold View Post
                    Glad it's working for you and thanks for the update, most folks never come back to tell us how it worked out.
                    Thanks to everyone taking the time to explain with examples and numbers.

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