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Viessman & Wilo

ScottMP Member Posts: 5,884
I would have called that a Heavy Downpour but it was wet and cloudy :)

Nice to see you miving forward with your solar project. Take photos, I'd love to see your install


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  • singh
    singh Member Posts: 866
    Divicon Solar

    My evacuated 20 tubes and accessories finally arrived today.

    I was surprised and happy to see the Wilo Star pump on the newly designed divicon. A good match. Can't wait for the Wilo Eco pump to be available.

    I'll take some pictures as a go along, It will be awile though , been busy lately.
    It's just for dhw, pre-heat before my tankless. Unfortunately, I could not afford a Viessman storage tank, that gray paint sure is expensive, had to settle for Buderus blue st-200.

    In case anyone in NY is interested, a 25% state credit is applicable, plus no sales tax, as well as the Feds 30%. I'm expecting less than two year payback.

    Question for anyone who knows: I'm thinking about a very small PV panel and inverter to offset the pump, when sun is shinning, what is out there?

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  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928

    Here's a possible Solar Power Supply 110 VAC, 40 watt. Note that the battery is NOT included.

    I presume the small output adds considerably to the cost per watt (about $22.50) for this system.

    "Payback" always seems an iffy proposition with solar PV systems, but in this case it seems especially troublesome. If you got 320 watts per day and electricity cost $0.15/kwh it would take about 51 years for payback (less labor and batteries). Even with state/federal "incentives" I rather doubt the system could ever pay for itself and likely would never produce the energy required to manufacture it in the first place...

  • Perry_3
    Perry_3 Member Posts: 498
    To make matters worse...

    Solar PV Cells degrade with time.

    While I have not kept up with the latest... a few years ago 20 years was considered the maximum useful life of most solar cells. If I recall correctly, at 20 years you can expect no more than 2/3 of the new rated output of the solar cells... and some of them will be at 1/2 the new rated output. If you want better performance he real expensive ones that they use for spacecraft last longer... but even they degrade.

    Most people selling solar cells and preaching a solar alternative are not telling people about the long term degrading performance.

    So as a correction, not only will this system not pay itself back in 51 years... It wont last that long either. The other thing is the batteries you need to make it work. Batteries are not a long life item either... even large specificly designed storage batteries like you need (which are not cheap by any standard). Our plant has 4 or 5 battery rooms and I think the maximimum battery life is about 15 years - and the batteries are properely maintained every month including switching out an isloated bad cell every now and then.

    Solar photaics has a long way to go to being economical except for remote installations where you can offset their cost by the cost of not running utility lines or installing other generation capabilities.

  • Supply House Rick
    Supply House Rick Member Posts: 1,404
    Ahhh 2 unproven companies


    Hello Devan! How's everything? How's your AWOL salesperson? Did you know you can actually heat a home with air instead of water?

    Sincerely, from the dark side

    Mr. Hart & Cooley
  • ALH_4
    ALH_4 Member Posts: 1,790
    Why Wilo?

    I wonder why Viessmann is not using a Grundfos pump?

    Unfortunately, the push toward solar seems to always focus on photovoltaics. As Perry mentioned, there are so many longevity, large initial investment, and efficiency problems that solar thermal systems look excellent in comparison.
  • hr
    hr Member Posts: 6,106
    why not just use a PV

    panel and 12V circ and skip the Wilo. I use this small Kyocera panel and that nifty new Laing D-5 ECM solar circ. All told about 400 bucks worth. Use the Wilo for another project.

    I've been able to remove the 120V circ from the "box" and install the Laing in the same space.

    I see www.arttec.net/dtc now makes a 12V PV powered differential control, if you think you need one. About 84 bucks.

    hot rod

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  • singh
    singh Member Posts: 866

    Just what I'm looking for. Thanks.

    I just may run this year with the current pump, and wait for the WIlo Eco , which also can go into the 5 watt range.

    Rick, how are you? Tired of selling leaf blowers yet?

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  • Supply House Rick
    Supply House Rick Member Posts: 1,404
    Hey, not fair

    I sell registers, grilles, duct fans, B-Vent, All Fuel etc. All quality merchandise at a fair competitive price! Hahaha
  • Bill W@Honeywell
    Bill W@Honeywell Member Posts: 164
    I saw the Viessman solar items at NAOHSM...

    That evacuated tube collector, pump package & tank looked awesome. The rep said that a two collector array was producing 98 degree water on a rainy day in Warwick, RI in late April. They also had a more conventional flat-panel collector. Please post your results, I sure the others here would be very interested as well. That system looked simple to install, maintain and expand, and you can't beat the "package" concept. Any other "real world" solar info is of interest to me, please keep us posted.
  • singh
    singh Member Posts: 866
    April showers

    I was in Warwick, RI last April lookig at the collectors on the roof of the Viessmann HQ during a heavy downpour. I can verify that it was making hot water.
    I'll keep you posted, My system will be a side wall install, so may not be the most optimum , but should still give good results.

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