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  • #16
    Originally posted by Willy T View Post
    lol, crap from flea bay.

    Then get it from Amazon.

    http://www.amazon.com/Digital-Clamp-.../dp/B005HOPRRK



    The Kline Tools meter listed below is AC amps only. It says CL 2000 but the link is not for that meter.

    CL 1200

    Key Features:

    Auto-ranging clamp meter measures AC/DC voltage, AC current, resistance, capacitance, frequency and duty cycle.
    Also tests non-contact voltage, diodes, and continuity.
    Backlit display and work light.
    Built-in magnetic mount for hands-free convenience.
    Non-contact voltage tester.
    Quick response analog bar graph shows elusive flucutations.
    Built-in lead storage protects leads.
    Includes case, test leads and batteries.
    CAT IV safety rating.
    Height: 7.65 in.
    Weight: 1 lb
    Width: 2.56 in. (65 mm)
    Batteries: 2 x AAA
    Jaw Size: 1.25 in. (32 mm)
    Ingress Protection: IP42
    Drop Protection: 2 m / 6 ft.
    Safety Rating: CAT IV 600V
    A/C current is only a small portion of what is needed.
    DC is more important
    The temperature reading is actually not as important. I have a IR temp meter
    NABCEP certified Technical Sales Professional

    [URL="http://www.solarpaneltalk.com/showthread.php?5334-Solar-Off-Grid-Battery-Design"]http://www.solarpaneltalk.com/showth...Battery-Design[/URL]

    [URL]http://www.calculator.net/voltage-drop-calculator.html[/URL] (Voltage drop Calculator among others)

    [URL="http://www.gaisma.com"]www.gaisma.com[/URL]

    Comment


    • #17
      If batteries connected in series offer more volts and more capacity then whats the point of parallel connection? More amps doesn't seem to offer any advantage in a solar panel set up.

      Comment


      • #18
        Originally posted by coinmaster View Post
        If batteries connected in series offer more volts and more capacity then whats the point of parallel connection? More amps doesn't seem to offer any advantage in a solar panel set up.
        Congratulations on reaching a level of knowledge that still eludes some members!
        But answers include being limited to 12V for compatibility with existing equipment. But in that case you still have to option of going with commercial batteries in 6V, 4V or even 2V values to go in series.

        Another "answer" is getting access to lots of cheap 12V batteries and being stuck with the mindset of a 12V bank.

        Finally, for a small system going with 12V "battery" panels and a PWM controller argues for a 12V system.

        But all of these are weak arguments.
        SunnyBoy 3000 US, 18 BP Solar 175B panels.

        Comment


        • #19
          Originally posted by coinmaster View Post
          If batteries connected in series offer more volts and more capacity then whats the point of parallel connection? More amps doesn't seem to offer any advantage in a solar panel set up.
          One point is that to obtain the capacity you need at a desired voltage (eg 12, 24, 48), you may need to use parallel batteries. For example, let's say I am using Lithium Iron Phosphate batteries, and the available cells are 3.2V 100Ah, 200Ah and 300Ah, and I need 48V 600Ah.

          Unless I plan to open my own LFP battery factory in China, I need to use what is available. To use the least # of cells, I choose 300Ah x 2 x 8: 8 pairs of 2 in parallel.

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          • #20
            I was checking out an ah to kwh calculator and it seems more volts = more kwh. For example 250 ah at 12v = 3 kwh and 250 ah at 48v = 12 kwh.
            So if I bought 4 12v 62 ah batteries would it trump 2 12v 125 ah batteries?

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            • #21
              Originally posted by coinmaster View Post
              I was checking out an ah to kwh calculator and it seems more volts = more kwh. For example 250 ah at 12v = 3 kwh and 250 ah at 48v = 12 kwh.
              So if I bought 4 12v 62 ah batteries would it trump 2 12v 125 ah batteries?
              No. Because 4 x 12V x 62AH = 2976 watt hours, while 2 x 12V x 125AH = 3000 watt hours. A toss up.
              More volts means more kWh, but more AH also means more kWh.
              SunnyBoy 3000 US, 18 BP Solar 175B panels.

              Comment


              • #22
                Your calculation method is off. It's AH x V / 1000. Your method is multiplying the voltage and not the amount of batteries.
                250 x 48 / 1000 = 12
                250 x 24 / 1000 = 6
                Which would mean a 48v battery bank would last twice as long as a 24v battery bank.
                Unless I'm wrong.

                Comment


                • #23
                  Originally posted by coinmaster View Post
                  Your calculation method is off. It's AH x V / 1000. Your method is multiplying the voltage and not the amount of batteries.
                  250 x 48 / 1000 = 12
                  250 x 24 / 1000 = 6
                  Which would mean a 48v battery bank would last twice as long as a 24v battery bank.
                  Unless I'm wrong.
                  You are incorrect.

                  On paper it makes no difference a 12 volt 62 AH battery = 744 Watt Hours x 4 = 2976 watt hours, As I stated before power adds no matter how you arrange the 4 batteries.

                  12 volts x 248 AH = 2976 wh; All 4 batteries in parallel
                  24 volts x 124 AH = 2976 wh; 2 in series, in parallel with 2 in series
                  48 volts x 62 AH = 2976 wh; All 4 in series.

                  Series circuits: Voltage and Power adds. Amp remains the same
                  Parallel circuit: Amps and Power Adds, Voltage remains the same.
                  MSEE, PE

                  Comment


                  • #24
                    Originally posted by coinmaster View Post
                    Unless I'm wrong.
                    Where you are going wrong is assuming that batteries in series increase both voltage and Ah. They don't. Batteries in series increase voltage only, Ah doesn't add. Batteries in parallel increase Ah only, voltage doesn't add.
                    CS6P-260P/SE3000 - http://tiny.cc/ed5ozx

                    Comment


                    • #25
                      Originally posted by sensij View Post
                      Where you are going wrong is assuming that batteries in series increase both voltage and Ah. They don't. Batteries in series increase voltage only, Ah doesn't add. Batteries in parallel increase Ah only, voltage doesn't add.
                      You are correct. Maybe putting up some type of visual diagram will make it clear to some of the people that still don't get the "math" part.

                      Comment


                      • #26
                        Why do these calculators
                        https://lazycackle.com/Convert_from_...alculator.html
                        http://everydaycalculation.com/ah-kilowatt-hour.php
                        http://www.hupsolar.com/questions-ab...s-to-Amp-hours
                        http://www.altenergydesign.com/offgrid.html
                        say more voltage = more kwh at the same Ah then?

                        Also @sunking you're changing the ah along with the voltage, that doesn't make any sense. The point is to have 4 62 ah batteries to = 2 125 ah batteries which = 1 250 ah battery. The only thing that changes is the voltage.

                        Comment


                        • #27
                          Because those calculators do not take into consideration how the battery system is built.

                          A 12volt 100Ah battery gets you a 12volt 100Ah system = 1200 watt hours.

                          And 4 x 12volt 100Ah batteries wired in series get you a 48 volt 100Ah system = 4800 watt hours

                          So the higher voltage battery system at 48volts yields more than that 12volt system but there is a different number of batteries involved.

                          If you take those same 4 batteries and wire them in parallel you will get a 12 volt 400Ah system = 4800 watt hours.

                          So you will get 4800 watt hours if you wire those 4 batteries in series or parallel which is what the others have been trying to tell you.

                          Comment


                          • #28
                            I see.

                            Comment


                            • #29
                              Originally posted by coinmaster View Post
                              Why do these calculators
                              https://lazycackle.com/Convert_from_...alculator.html
                              http://everydaycalculation.com/ah-kilowatt-hour.php
                              http://www.hupsolar.com/questions-ab...s-to-Amp-hours
                              http://www.altenergydesign.com/offgrid.html
                              say more voltage = more kwh at the same Ah then?

                              Also @sunking you're changing the ah along with the voltage, that doesn't make any sense. The point is to have 4 62 ah batteries to = 2 125 ah batteries which = 1 250 ah battery. The only thing that changes is the voltage.
                              No both the voltage and Ah ratings change based on how they are wired

                              4 x 12volt 62Ah wired in parallel = 12v 248Ah system = 2976 watt hours
                              2 x 12volt 125Ah wired in parallel = 12v 250Ah system = 3000 watt hours
                              1 x 12volt 250Ah battery = 12v 250Ah system = 3000 watt hours.

                              4 x 12volt 62Ah wired in series = 48v 62Ah system = 2976 watt hours
                              2 x 12volt 125Ah wired in series = 24v 125Ah system = 3000 watt hours
                              1 x 12volt 250Ah battery = 12v 250Ah system = 3000 watt hours

                              Comment


                              • #30
                                Yeah, I get it now. Thanks.

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