Considering solar water heat but have concerns.

oil pan 4oil pan 4 Posts: 669Solar Expert ✭✭✭✭
I am considering solar water heating and got to looking at some of the gear and I noticed something.
The typical setup appears to use exposed glass tubes.
Problem with that is pretty consistently we have had golf ball size hail storms just about every year to every other year and baseball size hail every 5 to 8 years.
Can these things take hail stones or do I need to devise a way to shield it with chicken wire or something?
Or are these things make from tempered 1/4 inch thick glass and I just don' know it?

Solar hybrid gasoline generator, 7kw gas, 180 watts of solar, Morningstar 15 amp MPPT, group 31 AGM, 900 watt kisae inverter.

Solar roof top GMC suburban, a normal 3/4 ton suburban with 180 watts of panels on the roof and 10 amp genasun MPPT, 2000w samlex pure sine wave inverter, 12v gast and ARB air compressors.

Comments

  • westbranchwestbranch Posts: 5,010Solar Expert ✭✭✭✭
    edited January 27 #2
    A Lexan shield/ cover?
    Screen door glass is tempered.... I used it for my sundeck railing, to not have solid wood pales ~ 7 feet x 3 feet IIRC
     
    KID #51B  4s 140W to 24V 900Ah C&D AGM
    CL#29032 FW 2126/ 2073/ 2133 175A E-Panel WBjr, 3 x 4s 140W to 24V 900Ah C&D AGM 
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    Eu3/2/1000i Gens, 1680W & E-Panel/WBjr to come, CL #647 asleep
    West Chilcotin, BC, Canada
  • EstragonEstragon Posts: 2,219Registered Users ✭✭✭✭
    I plan to use black poly water pipe. Not quite as efficient as evacuated glass tube, but hail won't hurt it, and if some water is left in low points over winter, it won't burst. It's also a lot cheaper.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
  • solar_davesolar_dave Posts: 2,335Solar Expert ✭✭✭✭
    I have a 4X10 collector that is a copper tube flat panel with a lexan cover. I was hit with some golf ball size hail with no visible ill effects. I would say it provides 95%+ of our hot water needs for 10 month out of the year.

    I did look at evacuated tube collectors and they are more efficient but not required in my environment, hell its 84F right now. I do believe the reputable manufacturers will have hail test results for their equipment.

    Personally I think solar hot water is a long payoff vs natgas. For me it was a greenie wife! :smile:
  • peakbagggerpeakbaggger Posts: 12Registered Users ✭✭
    Wow, this is bit of blast from the past. Standard solar hot water collectors for domestic hot water be they flat plate or evac tubes are pretty well dead technology compared to just buying a couple of more PV panels and a heat pump hot water heater. The problem with conventional collectors is they overproduce when you dont need them and underproduce when you do. The upfront cost if far better spent on the HPHWH and the extras PV's. BTW I have flat plates run by a DC pump fed from a PV paneland it just keeps running. I think I lost one bladder tank during its life and had one check valve self destruct. 

    I dont see a lot of new evac tubes systems out there, the warranty claims that busted companies meant that many Evac arrays have many dead tubes and no one to honor the warranty.
  • oil pan 4oil pan 4 Posts: 669Solar Expert ✭✭✭✭
    I have a heat pump water heater already.

    Solar hybrid gasoline generator, 7kw gas, 180 watts of solar, Morningstar 15 amp MPPT, group 31 AGM, 900 watt kisae inverter.

    Solar roof top GMC suburban, a normal 3/4 ton suburban with 180 watts of panels on the roof and 10 amp genasun MPPT, 2000w samlex pure sine wave inverter, 12v gast and ARB air compressors.

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