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    I was wondering if I had a 3800 watt 240 volt hot water heater how many solar panels would I need to power it? I'd have an on off switch and only use it about 3 hours a day. So how many amps and volts on a solar panel would I need to power it for an hour. Also how do I calculate how many amps a 12 volt solar battery will hold?

  • #2
    How many thousand of dollars are you willing to spend? It will take at least high 4 decimal places $$$$, more than likely low 5 $$$$$ unless you live on the Left Southern coast of LA or south of there . Need to know more?
    MSEE, PE

    Comment


    • #3
      I would look at a solar hot water heater, not electric .

      Collecting solar heat is about 40% efficient, solar electric is about 15%.

      Look at http://solarroofs.com/ for some good DIY sizer and info.
      spreadsheet based voltage drop calculator:
      http://www.solar-guppy.com/download/...calculator.zip
      http://www.solarpaneltalk.com/showth...oss-calculator

      http://www.mike-burgess.org/PVinfo_2.html

      solar: http://tinyurl.com/LMR-Solar
      gen: http://tinyurl.com/LMR-Lister ,
      battery lugs http://tinyurl.com/LMR-BigLug
      Setting up batteries http://tinyurl.com/LMR-NiFe

      gear :
      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

      Comment


      • #4
        I know you didn't ask this, but these guys look cool. I hope they're successful and the technology plays out! Hot water & electricity generation in the same unit (from what I can tell)

        http://www.pvtsolar.com/
        My Sunpower System:
        https://www.sunpowermonitor.com/resi...6&type=address

        Comment


        • #5
          I don't like a website that is pretty but has no facts or details on it.

          The most informative statement provided on the entire site is, 'PVT Solar cannot guarantee performance results'.

          The hot water and electrical generation assumptions they make are not supported by anything but salesman talk.

          The graphics page shown is pretty. Until they become more informative I would not bother with them. They do know all the buzz words and catch phrases. They throw in the DOE and the names of it's programs and software - you can also get that stuff off the DOE site.

          Russ
          sigpic

          Comment


          • #6
            Originally posted by Stomp View Post
            I know you didn't ask this, but these guys look cool. I hope they're successful and the technology plays out! Hot water & electricity generation in the same unit (from what I can tell)

            http://www.pvtsolar.com/
            vapor ware
            spreadsheet based voltage drop calculator:
            http://www.solar-guppy.com/download/...calculator.zip
            http://www.solarpaneltalk.com/showth...oss-calculator

            http://www.mike-burgess.org/PVinfo_2.html

            solar: http://tinyurl.com/LMR-Solar
            gen: http://tinyurl.com/LMR-Lister ,
            battery lugs http://tinyurl.com/LMR-BigLug
            Setting up batteries http://tinyurl.com/LMR-NiFe

            gear :
            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

            Comment


            • #7
              I saw a water heater that was around 3800 watts, 16 amps, 240 volts. So wouldn't it take a lot less watts to power, like a solar panel that was 24 volts, 15 amps, it would only have to be around 160 watts if I don't use it at night anyway so I'd need no extra.

              Comment


              • #8
                How many liters (gallons) hot water would you plan on using? What is the water temperature before heating and the desired hot water temperature. Those numbers are the basis of all calculations.

                To estimate the consumption the DOE web site has a format http://www.energysavers.gov/your_hom.../mytopic=12990

                If you provide a quantity I will try to assist you.

                Russ
                sigpic

                Comment


                • #9
                  Heliatos solar water heater

                  I came across this product that looks promising.

                  http://www.heliatos.com/

                  Ray
                  --Ray
                  8xSV-X-195-LV - 22.80 Voc - 18.30 Vmp - 10.66 Imp - 11.55 Isc
                  2xUL Solar 85w - 21.9 Voc - 17.9 Vmp - 4.84 Imp - 5.17 Isc
                  1xUL Solar 120w - 21.9 Voc - 18.1 Vmp - 6.6 Imp - 6.8 Isc
                  7xHF 15w - 23.57 Voc - 17.5 Vmp - 0.86 Imp - 1.15 Isc
                  MorningStar MPPT 60 Charge Controller
                  Midnite Classic 150 Charge Controller
                  700ah used Gel batteries
                  Xantrex PROWatts 600 PSW Inverter
                  HF 1000/2000 MSW Watt Inverter

                  Comment


                  • #10
                    The problem with Heliatos is that they are very small units 24'' square more or less (600mm square. They seem to be certified by 'Tony, Two Guys and a Truck'. They would not qualify for any rebates certainly.

                    If a panel is not listed by the Solar Rating and Certification Corporation http://www.solar-rating.org/

                    A good source of information is 1) http://www2.fsec.ucf.edu/en/industry...nual/index.htm

                    Russ
                    sigpic

                    Comment


                    • #11
                      Originally posted by hughconley3 View Post
                      Also how do I calculate how many amps a 12 volt solar battery will hold?
                      you need to find out the AMP-HOURS of the battery.

                      For example, a 100 AMP-HOUR Battery will power a 1 AMP load for 100 hours or a 10 amp load for 10 hours. However, you should not discharge your battery more than 50% or your battery life will be shortened, so divide those numbers by two.

                      Comment


                      • #12
                        Originally posted by hughconley3 View Post
                        ....Also how do I calculate how many amps a 12 volt solar battery will hold?
                        No calculation needed, it's printed on the battery. Batteries are sold by volts and amp hours.
                        spreadsheet based voltage drop calculator:
                        http://www.solar-guppy.com/download/...calculator.zip
                        http://www.solarpaneltalk.com/showth...oss-calculator

                        http://www.mike-burgess.org/PVinfo_2.html

                        solar: http://tinyurl.com/LMR-Solar
                        gen: http://tinyurl.com/LMR-Lister ,
                        battery lugs http://tinyurl.com/LMR-BigLug
                        Setting up batteries http://tinyurl.com/LMR-NiFe

                        gear :
                        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

                        Comment

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