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Where do I start with Solar heating

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  • #16
    Capex:
    Sanden 4K
    Taco RMB 1K
    Eco 11k $200
    Pressure Pal MF200S $600
    Heat Exchanger $150
    Filter/Expansion tank $200
    Manifolds x2 $300
    Mixing Valves x2 $300
    Misc Plumbing estimated ~1k
    -------
    Total: ~8K + labor

    Solar heat exchangers/sensors/pumps TBD later

    Last edited by NetComrade; 03-15-2018, 01:52 PM.

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    • #17
      All,

      I've followed up with a post on the heating forum on this
      https://forum.heatinghelp.com/discus...esign/p1?new=1

      After doing some reading, I think I found a solution that will work.. here's a copy and paste of my last post
      After reading the following..

      https://www.bpa.gov/EE/Technology/EE...Research-.aspx

      I decided to flip the Sanden to the DHW side of the heat exchanger.. Sanden really likes the water to be colder. I will need to filter water to minimize impact of well water to equipment.

      The long paper basically validated my design (as it has been field tested with backup), and my new design now looks more like the design used in this study.

      This will also allow me to pre-heat water for radiant use (but not DHW, although that could be figured out later, IMO), which would have been difficult if Sanden was on the 'heating' side of the plumbing.

      Diagram is overly simplified, and will need additional plumbing details by a professional,.

      20180319_122415_small.jpg

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      • #18
        sorry to post it here as Admin haven't approve for new user like me yet.

        my question is: can I connect 2 panel with different voltage in parallel?
        Suntech STP250 - 20/Wd Specifications

        [TABLE="border: 0, cellpadding: 0, cellspacing: 0"]
        [TR]
        [TD]STC[/TD]
        [TD]STP250-20/Wd[/TD]
        [/TR]
        [TR]
        [TD] [/TD]
        [TD] [/TD]
        [/TR]
        [TR]
        [TD]Maximum Power at STC (Pmax)[/TD]
        [TD]250 W[/TD]
        [/TR]
        [TR]
        [TD]Optimum Operating Voltage (Vmp)[/TD]
        [TD]30.7 V[/TD]
        [/TR]
        [TR]
        [TD]Optimum Operating Current (Imp)[/TD]
        [TD]8.15 A[/TD]
        [/TR]
        [TR]
        [TD]Open Circuit Voltage (Voc)[/TD]
        [TD]37.4 V[/TD]
        [/TR]
        [TR]
        [TD]Short Circuit Current (Isc)[/TD]
        [TD]8.63 A[/TD]
        [/TR]
        [TR]
        [TD]Module Efficiency[/TD]
        [TD]15.4%[/TD]
        [/TR]
        [TR]
        [TD]Operating Module Temperature[/TD]
        [TD]-40

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        • #19
          Originally posted by monogram View Post
          sorry to post it here as Admin haven't approve for new user like me yet.

          my question is: can I connect 2 panel with different voltage in parallel?
          Generally, yes, as long as they have Vmp spec within 10% of each other - you only listed one Vmp 30.7v

          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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