controllers with 2 temps

ws9876
ws9876 Solar Expert Posts: 448 ✭✭✭
in General Solar Power Topics #1
some people with a woodstove might like to run a heat exchange system to heat water...it comes on when the room temp gets above 70
and turns on a pump to run fluid thru a panel next to the stove (not in the stove)and then thru coils in a hot water tank. But only if the water in the tank is less than 95 and not over 105.....so you need 2 probes that can short the pump system if either parameter is not met.. and one of them has to have a hi/lo capability .. what controller would you use for this ..especially the lower cost ones..
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #2
    Wood stove must be Pressure & Temp protected. and relying on pumps (that fail or loose power) is a bad idea.   I use thermal siphon, totally passive and all high points protected with  T & P vented valves (like on a standard waterheater)
    Powerfab top of pole PV mount | 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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  • ws9876
    ws9876 Solar Expert Posts: 448 ✭✭✭
    #3
    if its a drainback setup there is no problem...of course there would be prv in appropriate places. how does yours work exactly?? 
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  • MichaelK
    MichaelK Registered Users Posts: 236 ✭✭✭
    #4
    Mike, I'm also looking into installing a thermosiphon in my kitchen cookstove.  Could you please quantify some performance values about yours, like how long of a burn heats X gallons of water, Y degrees above ambient?
    System 1) 15 Renogy 300w + 4 250W Astronergy panels,  Midnight 200 CC, 8 Trojan L16 bat., Schneider XW6848 NA inverter, AC-Delco 6000w gen.
    System 2) 8 YingLi 250W panels, Midnight 200CC, three 8V Rolls batteries, Schneider Conext 4024 inverter (workshop)
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #5
    So, the mfg of the Heat Loop should supply the apx BTU the loop is rated for.  Here is one link
    http://www.firespeaking.com/media/articles/details-of-plumbing/
      My masonry heater (2hr fire) will be vastly different than a wood stove (8 hr fire)
    For thermal siphon, BE sure the pipes have a slant, no loop, no high/lo which will block the flow and cause a steam explosion.
    There should be no "gurgling" it should be absolutely silent.  Loop should be SS boiler tube, connected to copper, not plastic.

    And attached is my "schematic"    i estimate 30K BTU each firing, and keep the 80 gal tank about 90 - 110 F in the winter



    Powerfab top of pole PV mount | 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 ,

    · Share on Twitter

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