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Post by fredinireland on Feb 11, 2019 9:11:54 GMT
As someone already pointed out any shading is bad for solar modules. Looking at your images having even a small amount covered across the short side will cut the output of the whole module due to the wiring pattern. Have you tested these yet with a meter to check the output?
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Post by ania on Feb 12, 2019 3:06:12 GMT
Not yet, as soon as I test it results will be posted. I don't think its that bad. Will see. In any case its better than nothing. If I don't like the way it performing, we will build frame on top of existing bimini and solid panels will be installed.
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Post by rdubs on Feb 13, 2019 15:43:25 GMT
In brief if there is a chance of partial shading panels should be connected in parallel This, this, ten times this. The absolute best (in my opinion) configuration with an MPPT controller is to have four panels and wire them in a parallel-series-parallel configuration. That is, the power lead from the controller comes into the bottom of two panels whose outputs are also combined (so you have two panels in parallel), then this combined output is fed to the inputs of two other panels. The outputs of those two second-tier panels are combined and this output is fed to the controller. So you have two panels in parallel whose output is the input for two other panels in parallel. This setup provides the best all-around hedge for shading but also lets you obtain the higher voltages that MPPT controllers love. MPPT controllers will still work with just a bunch of panels wired all in parallel, but it won't be nearly as efficient. I use this setup for my boat, which has 4x100W Renogy "compact design" panels and I couldn't be happier. For your setup, since you have 3 panels, you may want to consider wiring two in parallel whose output feeds into the other panel, but I'm not sure if that might overload the upper single panel. If anyone would know it would be Vasko, what a guru.
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Post by vasko on Feb 13, 2019 17:53:38 GMT
How mppt works : www.leonics.com/support/article2_14j/articles2_14j_en.phpmppt minimise the loss in the cables but generate a loss from the dc-dc convertor e.g sizing you cables properly is quite important when parallel connection is required. Un equal on watts groups (or single panels) connected in series is a HUGE no-no Remember the most important facts: 1. When shaded a panel still generate the same voltage but has lower amps 2. In parallel the minimal voltage across all panels and the added amps is the result. 3. In series the minimum amos and the added voltage is tbe result. When installing in serries check that the maximum voltage from tbe system should lower then tbe maximum supported by the mppt controller. If the resulting voltage is over 48v then this can be a safty issues also!
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