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  • #16
    Originally posted by roscho04 View Post
    Why don't you just get a batties back up system,so when power loss happens batties take over .
    ? Don't understand what you are getting at.

    Russ
    [SIGPIC][/SIGPIC]

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    • #17
      could even use a PV panel, to keep pump running even in a blackout, and then have no hot / boiling water stagnation.
      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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      • #18
        His 1st post was about power failure and collectors over heating and when power came back on the high heat from the collector would be to hot for the pex. If he had batteries charging,when he had a power failure they would run pumps.

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        • #19
          Originally posted by roscho04 View Post
          His 1st post was about power failure and collectors over heating and when power came back on the high heat from the collector would be to hot for the pex. If he had batteries charging,when he had a power failure they would run pumps.
          Kind of a round about way and expensive way to solve the problem but it could be done.

          You could also use one of the bubble action pumps and that problem is gone but they want an arm and a leg for the units plus the system has to be maintained under a partial vacuum - not all that easy.

          Russ
          [SIGPIC][/SIGPIC]

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          • #20
            just one way to solve a power loss problem,i will check out that vacuum pump sounds cool,look almost like the diffusion pump we run on our metalizers.(but much smaller)

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            • #21
              Thanks for the solutions, seems to me that naptown's idea of a mix valve installed before the hot fluid gets to the pex would seem to be the answer. Lowest cost and easy to instal, mix fluid going to the panel from the pump to cool the fluid from the panel. If I set the mix at 120f or so I would think it should work. Any one have a thought as to why it wouldn't?

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              • #22
                Originally posted by tandemsforus View Post
                Thanks for the solutions, seems to me that naptown's idea of a mix valve installed before the hot fluid gets to the pex would seem to be the answer. Lowest cost and easy to instal, mix fluid going to the panel from the pump to cool the fluid from the panel. If I set the mix at 120f or so I would think it should work. Any one have a thought as to why it wouldn't?
                Power goes off, pump stops. will it thermosiphon ?
                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

                Comment


                • #23
                  Originally posted by Mike90250 View Post
                  Power goes off, pump stops. will it thermosiphon ?
                  Probably not, to much resistance through the mixing valve and piping. Thermosiphon works best with oversized piping and no restrictions.

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                  • #24
                    For the bubble action pumps http://www.bubbleactionpumps.com/index.htm

                    In regards to the thermosiphon effect - most likely it will unless a check valve or preferably a siphon breaker is designed into the tubing. This one I have personal experience with.

                    Russ
                    [SIGPIC][/SIGPIC]

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                    • #25
                      Originally posted by russ View Post
                      For the bubble action pumps http://www.bubbleactionpumps.com/index.htm

                      In regards to the thermosiphon effect - most likely it will unless a check valve or preferably a siphon breaker is designed into the tubing. This one I have personal experience with.

                      Russ
                      The mixing valve is the unknown in this situation. Is the internal resistance low enough to allow flow? Also the pex is in the slab horizontally and has high resistance because of the small diameter and length of the loops. What are the chances of the hot water running through the pex?
                      Some one has to try it to find out.

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                      • #26
                        If flow is a concern use a Grundfos Alpha pump where you can set the flow rate and the pump will compensate. A mixing valve is a required part of any floor radiant system where a boiler is involved and there are zones that are run at higher temps.
                        One way to plumb is with primary and secondary loops off the panels.
                        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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