Adding Panels to existing system

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  • Solarpod
    Junior Member
    • Feb 2012
    • 4
    #16
    adding another panel

    Originally posted by Mike90250
    Bypass diodes embedded in the panels are only rated to handle being invoked occasionally. A daily shade source will eventually BBQ the diodes in the shaded panel.
    In that case, adding a parallel panel seems like a good idea, as it would protect that panel in the afternoon.
    Last edited by Solarpod; 02-29-2012, 06:52 PM. Reason: skipped a word

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      • Mike90250
        Moderator
        • May 2009
        • 16020
        #17
        Originally posted by Solarpod
        In that case, adding a parallel panel seems like a good idea, as it would protect that panel in the afternoon.
        Cool. I've never seen that done, ever.

        If you have a shaded panel, move it, it's useless in the shade. No need to buy another panel to go in parallel with it, when both are in sun, the rest of the string will throttle the power back to what only 1 panel produces.

        These arrays have to be designed, not just " throw stuff on the roof till something works"
        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

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          • Solarpod
            Junior Member
            • Feb 2012
            • 4
            #18
            Not so easy

            Originally posted by Mike90250
            Cool. I've never seen that done, ever.

            If you have a shaded panel, move it, it's useless in the shade. No need to buy another panel to go in parallel with it, when both are in sun, the rest of the string will throttle the power back to what only 1 panel produces.

            These arrays have to be designed, not just " throw stuff on the roof till something works"
            I didn't design it. I am just the home owner. Unfortunately, I also know a little bit about physics and electronics. Until I convince the city that their panel placement restrictions are ill-advised, I have to live with the roof I have. The panel begins around 3 to be shaded. As long as the diode across the shaded panel holds up, it may not be worth worrying about. Maybe in the winter...
            Many thanks for the help.

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              • Naptown
                Solar Fanatic
                • Feb 2011
                • 6880
                #19
                At three in the afternoon you are beyond prime time the losses are going to be not great.
                NABCEP certified Technical Sales Professional

                [URL="http://www.solarpaneltalk.com/showthread.php?5334-Solar-Off-Grid-Battery-Design"]http://www.solarpaneltalk.com/showth...Battery-Design[/URL]

                [URL]http://www.calculator.net/voltage-drop-calculator.html[/URL] (Voltage drop Calculator among others)

                [URL="http://www.gaisma.com"]www.gaisma.com[/URL]

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                  • russ
                    Solar Fanatic
                    • Jul 2009
                    • 10360
                    #20
                    Originally posted by Naptown
                    At three in the afternoon you are beyond prime time the losses are going to be not great.
                    A quick check using hourly insolation data from last June for my home shows about a 15% loss by losing everything after 1500 hours
                    [SIGPIC][/SIGPIC]

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                      • mabraham33
                        Junior Member
                        • Oct 2013
                        • 1
                        #21
                        solar rebate

                        when you added more solar you are able to write that off on your taxes right? state and federal? cause I am thinking of upgrading mine.

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