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Why 100 watts are not equal to 100 watts?

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  • #31
    This is tricky, the initial question was clear and while nobody owes nobody anything, it was... a bit of work to see the thread going the wrong direction. The tricky thing is how this can confuse a reader with the same question. I guess at the end the story will repeat itself over and over until the reader buys the stuff whatever ratings are printed, do the math, calculate some safety margins and then see how in real life the numbers just won't match. And it has nothing to do with lab ratings or lab conditions. It's was confusing to me, not it isn't, but it's tricky to explain without realizing it would be easily taken out of context or off topic.

    notifications off. See ya.
    Last edited by hroldan; 07-29-2019, 10:45 PM.

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    • #32
      Well, I just joined the forum and I have read most of the responses here and I think the moderator, SDOLD summed things up pretty well to answer this post. I experienced the same things with my first 100 watt panel having a 18 volt rating and 5.6 A maximum current output. I typically only got 4-5 amps out of it. Maybe 5 in the cooler weather, but closer to 4 in hot weather. At 4 amps I was doing 48-52 Watts. I recently found using a MPPT controller really improves my efficiency because it converts the unused voltage into usable power with up to 35% Amps. I definitely see a big difference charging at low voltages. So that has helped me. Also, you may check your inverter efficiency. It may be low and costing you extra wasted power. Mine is around 90% efficient, so not too bad. I'd encourage you try the MPPT controller as it will really help your efficiency.
      Last edited by Supernova532; 09-07-2019, 11:57 PM.

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      • #33
        Originally posted by Supernova532
        I experienced the same things with my first 100 watt panel having a 18 watt rating
        and 5.6 A maximum current output.
        Perhaps you mean 18 VOLT rating? It starts by getting your numbers and your units right, or you are lost.
        Then its about efficiency, energy gets away every step of the way. As someone once said

        You can not win

        You can not break even

        You can not get out of the game.

        Bruce Roe

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        • #34
          "Originally posted by Supernova532
          I experienced the same things with my first 100 watt panel having a 18 watt rating
          and 5.6 A maximum current output."

          Yes, typo, not big deal. Iif you read the context of the post anyone would know I was referencing voltage not power.

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          • #35
            Originally posted by Supernova532 View Post
            "Originally posted by Supernova532
            .......Yes, typo, not big deal. Iif you read the context of the post anyone would know I was referencing voltage not power.
            Maybe in horseshoes, typos don't matter. With engineering, terminology has to be precise, if you want precise answers. Several years ago, a joint ESA & NASA Mars lander crashed, because some of the software measured in meters, and some in feet. I'm sure everybody knew what was supposed to happen, but the terminology never made it to the spacecraft properly.

            Hey Bob, I borrowed some of the hold down bolts last night :

            noaa_n_prime_satellite_on_the_floor_700x621.jpg




            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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            • #36
              Originally posted by Supernova532 View Post
              "Originally posted by Supernova532
              I experienced the same things with my first 100 watt panel having a 18 watt rating
              and 5.6 A maximum current output."

              Yes, typo, not big deal. Iif you read the context of the post anyone would know I was referencing voltage not power.
              Maybe not a big deal to you. Typos or not, others not as astute as you who may take your written stuff as accurate can go astray by your error.

              Typos happen to all of us, me probably more than most, but considerate posters still check a post before pulling the trigger on it and know why.

              I suggest you take the constructive criticism, proof read your stuff more and move forward.

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              • #37
                Already checked to unsubscribe from notifications about this thread, but still receiving them... unsubscribed again.

                Mod - I tried, but my level of moderator does not allow me to alter your subscriptions. Sorry, Mike
                Last edited by Mike90250; 09-08-2019, 02:10 PM.

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                • #38
                  Originally posted by hroldan View Post
                  Already checked to unsubscribe from notifications about this thread, but still receiving them... unsubscribed again.
                  Could it be a typo?LOL

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                  • #39
                    Lucky for me I was not launching the NOAA satellite, just testing my $75 solar panel, typing a message late at night and made a typo. Yes, even engineers make typos. Time to move on. I corrected the typo in the post. Thanks.

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