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  • Calculation for recharging time!

    Hello guys~

    If I wana charging one 6V,10Ah Pb battery with 4.3w panel
    Does recharging time calculation like below?

    Battery capacity:6Vx10Ah=60watts
    4.3w/60w=13.9 hr

    Will use almost 14hrs to finish charging?

  • #2
    http://www.csgnetwork.com/batterychgcalc.html

    Just googled the title of your thread, something about "efficiency loss" might need to be figured in. (?)

    Comment


    • #3
      Originally posted by paulwater View Post
      Hello guys~

      If I wana charging one 6V,10Ah Pb battery with 4.3w panel
      Does recharging time calculation like below?

      Battery capacity:6Vx10Ah=60watts
      4.3w/60w=13.9 hr

      Will use almost 14hrs to finish charging?
      Correct format and units:

      60Wh/4.3W = 13.9h

      Actually you only want to run on the top 20 to 50% of the battery and also have to add in for losses.

      50%:
      60Wh / 4.3W * .5 * 1.5 = 10.5h

      20%:
      60Wh / 4.3W * .2 * 1.5 = 4.2h

      So you recharge times should be between 4.2 and 10.5 hours or typically 1 to 2.5 days at 4 hours average insolation.

      WWW

      Comment


      • #4
        Lorentz 3.0 software for pump sizing

        Hi

        Can any one send me the link or file for Lorentz software compass for sizing solar submersible pumps.


        Regards
        Ibra

        Comment


        • #5
          Well for one that 4.3 watt panel will not deliver 4.3 watts. YOu have two efficiency issues:

          1. Is the losses of the wiring and charge controller you have to account for.
          2. Battery charge efficiency. I assume this is a Flooded LEad Acid Battery? if so 80%

          A good rule of thumb is:

          H = AH / A / C

          Where H = Hours
          A = Amps
          C = Efficiency correction fact less 1

          So assuming this is a PWM controller using a 4.3 watt 6 volt panel A = .5 amps, and C = .8 for FLA then:

          H = [10 AH / .5 A / .8 = 25 Hours

          Assuming a 4 Sun Hour Day it will take a full week or 7 days to recharge from 0% SOC
          MSEE, PE

          Comment


          • #6
            Is 7 days quick enough for you PW?

            Comment


            • #7
              Originally posted by albert436 View Post
              http://www.csgnetwork.com/batterychgcalc.html

              Just googled the title of your thread, something about "efficiency loss" might need to be figured in. (?)
              Thank you for the Link!
              I'll try it!

              Comment


              • #8
                Originally posted by Wy_White_Wolf View Post
                Correct format and units:

                60Wh/4.3W = 13.9h

                Actually you only want to run on the top 20 to 50% of the battery and also have to add in for losses.

                50%:
                60Wh / 4.3W * .5 * 1.5 = 10.5h

                20%:
                60Wh / 4.3W * .2 * 1.5 = 4.2h

                So you recharge times should be between 4.2 and 10.5 hours or typically 1 to 2.5 days at 4 hours average insolation.

                WWW
                Hello Wolf
                Thank you for the answer,and would you mind explain me a little more?haha
                I don't understand "run on the top 20 to 50% of the battery" ,is mean use 20% and 50% panel efficiency to recharge battery?
                And what is 1.5?

                Thank you!

                Comment


                • #9
                  Originally posted by Sunking View Post
                  Well for one that 4.3 watt panel will not deliver 4.3 watts. YOu have two efficiency issues:

                  1. Is the losses of the wiring and charge controller you have to account for.
                  2. Battery charge efficiency. I assume this is a Flooded LEad Acid Battery? if so 80%

                  A good rule of thumb is:

                  H = AH / A / C

                  Where H = Hours
                  A = Amps
                  C = Efficiency correction fact less 1

                  So assuming this is a PWM controller using a 4.3 watt 6 volt panel A = .5 amps, and C = .8 for FLA then:

                  H = [10 AH / .5 A / .8 = 25 Hours

                  Assuming a 4 Sun Hour Day it will take a full week or 7 days to recharge from 0% SOC
                  Hello Sunking
                  I will calculate with two issues,thank you!And you were right,that battery is lead acid battery!Take it from solar traffic light!
                  I'll show the pic later!

                  About your answer I almost got it,there few words I can't understand!
                  Efficiency correction fact less 1? Is means 1=100%?
                  What is FLA,SOC?

                  Thank you!

                  Comment


                  • #10
                    Originally posted by albert436 View Post
                    Is 7 days quick enough for you PW?
                    It's ok!haha
                    Thanks!

                    Comment


                    • #11
                      Originally posted by paulwater View Post
                      Hello Wolf
                      Thank you for the answer,and would you mind explain me a little more?haha
                      I don't understand "run on the top 20 to 50% of the battery" ,is mean use 20% and 50% panel efficiency to recharge battery?
                      And what is 1.5?

                      Thank you!
                      20 to 50% of your battery would be 12 to 30Wh. You don't want to use any more than that or you will damage the battery.

                      1.5 is to compensate for system losses. That is about what a PWM charge controller system would lose. Your system is too small for an MPPT controller.

                      WWW

                      Comment


                      • #12
                        Originally posted by paulwater View Post
                        About your answer I almost got it,there few words I can't understand!
                        Efficiency correction fact less 1? Is means 1=100%?
                        What is FLA,SOC?

                        Thank you!
                        Efficiency Factor is 1 or less so yes 100% = 1
                        FLA = Flooded Lead Acid
                        SOC = State of Charge
                        MSEE, PE

                        Comment


                        • #13
                          Originally posted by Wy_White_Wolf View Post
                          20 to 50% of your battery would be 12 to 30Wh. You don't want to use any more than that or you will damage the battery.

                          1.5 is to compensate for system losses. That is about what a PWM charge controller system would lose. Your system is too small for an MPPT controller.

                          WWW
                          Ok!
                          Thank you so much!haha
                          I will show the device later!

                          Comment


                          • #14
                            Originally posted by Sunking View Post
                            Efficiency Factor is 1 or less so yes 100% = 1
                            FLA = Flooded Lead Acid
                            SOC = State of Charge
                            Thank you for explain me!

                            Comment


                            • #15
                              Check the device!

                              This is solar traffic light from china!
                              company say can work for seven days in cloudy condition!

                              the solar panel specification
                              Pmax 4.3W
                              Voc 9.6V
                              Vmp 8.0V
                              Isc 0.59A
                              Imp 0.54A

                              Battery
                              6V,10Ah
                              Attached Files

                              Comment

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