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Which Battery Types Can I use For 2400 Lumens & 150 Watt Solar Panel 18V Monocrystall

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  • Which Battery Types Can I use For 2400 Lumens & 150 Watt Solar Panel 18V Monocrystall

    Hi, Can any one help me?
    My name is Sameer Naik, I am from India,
    I want to use led lighting working on solar panel in remote areas e.g. Schools where electricity is not available for most of the times
    I will be using solar panel of specification given below.
    Please let me know what types of batteries can I use
    I require 2400 Lumens per room of (12 ft length X 12 ft Width X 10 ft Hight)
    I have attached the simple diagram of my requirement in the attachment - jpeg file.
    Thanks in advance
    -----------------
    Solar Mono Panel Cell 150 Watt Solar Panel 18V Monocrystalline Silicon Solar Cell Panel
    --------------------
    Voltage Mpp Vmp(V) 17.49V
    Current Mpp Imp(A) 8.58A
    -----------------
    Solar module - Mono-150W
    NominalPower Pmax(W) - 150W
    Voltage Mpp Vmp(V) - 17.49V
    Current Mpp Imp(A) - 8.58A
    Volt open circuit Voc(V) - 21.67V
    Short circuit current Mpp Isc(A) - 9.43A
    Size of module(MM) - 1485x668x35
    Weight(KG) - 9.5KG
    Max system volt(V) - 700V
    Standard test condition AM1.5,25℃,1000W/square meter
    -------------------
    req-jpeg.jpg

  • #2
    How many watts of LED does it take to produce the 2400 lumens? How many hours a day do you need the lighting?

    WWW

    Comment


    • #3
      Originally posted by Wy_White_Wolf View Post
      How many watts of LED does it take to produce the 2400 lumens? How many hours a day do you need the lighting?
      Both very good questions. Looks like lighting LEDs range from roughly 50 to 100 lm/watt. CREE last year announced it has passed the 300 lm/watt point. So it would be important to know what would be used. Also important to know how long they would be used daily.

      Comment


      • #4
        Originally posted by Wy_White_Wolf View Post
        How many watts of LED does it take to produce the 2400 lumens? How many hours a day do you need the lighting?

        WWW
        Most LED lights are now producing about 100 lumens per watt. So for 2400 lumens the OP would need about 24 - 30 watts of LED. The problem is that most LED lamps are directional so to keep from getting shadows you would need more than one lamps in that room.

        Helping the OP out more would require more information on what is being done in the room (reading, storage, assembly, etc.). Is the lighting general area or task?

        And more important as you have asked, how many hours a day with the lights need to be on?

        Comment


        • #5
          You put the cart in front of the horse, and that always fails. You only have a single 150 watt panel. Well that can support a single 12 volt 100 AH battery. No one can tell you if it will work or not.
          MSEE, PE

          Comment


          • #6
            Originally posted by Sunking View Post
            You put the cart in front of the horse, and that always fails. You only have a single 150 watt panel. Well that can support a single 12 volt 100 AH battery. No one can tell you if it will work or not.
            Can you elaborate, Dereck? Going backwards, which I know is the wrong direction, 12V 100AH would be 1200WH, and if the load is 30W, wouldn't that power the lights for 10 hours a day? What am I missing? Be nice - I am a novice.

            Comment


            • #7
              Originally posted by Living Large View Post
              Can you elaborate, Dereck? Going backwards, which I know is the wrong direction, 12V 100AH would be 1200WH, and if the load is 30W, wouldn't that power the lights for 10 hours a day? What am I missing? Be nice - I am a novice.
              How do you know it requires 30 watts for 10 hours? That is the issue, no useful parameters have been given. I am not going to waste my time with it until parameters have been given. So until daily watt hours has been determined. not much anyone can do. All we know is he has a 12 volt 150 watt battery panel. Most likely being in India is using low quality equipment like a PWM controller. That on a 150 watt battery panel generates just about 8 amps or 100 watts. At best will support a 12 volt 100 AH battery. That is all anyone can tell him other than it can support up to roughly 300 to 400 watt hours peer day. Keep it under that and OK. Go over that and it will not work. That is all I got, out of here.
              MSEE, PE

              Comment


              • #8
                Originally posted by Sunking View Post
                How do you know it requires 30 watts for 10 hours? That is the issue, no useful parameters have been given. I am not going to waste my time with it until parameters have been given. So until daily watt hours has been determined. not much anyone can do. All we know is he has a 12 volt 150 watt battery panel. Most likely being in India is using low quality equipment like a PWM controller. That on a 150 watt battery panel generates just about 8 amps or 100 watts. At best will support a 12 volt 100 AH battery. That is all anyone can tell him other than it can support up to roughly 300 to 400 watt hours peer day. Keep it under that and OK. Go over that and it will not work. That is all I got, out of here.
                OK - it just looked like he isn't necessarily out of the ballpark if his use is, *for example* 10 hours @ 30W. But I chose 10 hours randomly, and 30W is an assumption also based on 100 lm/W. I realize this is totally backwards from the way it should be done, and you can't assume each parameter and say "hey, it looks like this should work." As you say, the "best" it will support is a 12V @ 100AH battery, but you can't assume that either. Hopefully the OP will return and supply more information.

                Comment


                • #9
                  Originally posted by Living Large View Post
                  Can you elaborate, Dereck? Going backwards, which I know is the wrong direction, 12V 100AH would be 1200WH, and if the load is 30W, wouldn't that power the lights for 10 hours a day? What am I missing? Be nice - I am a novice.
                  And then you need to know the Sun hours (4-6 hours maybe) and if 120% of the power can be replaced in that time with the panel and controller.

                  Still not enough info from the OP as to wattage and hours of light, but I think it's going to kill the battery.
                  Powerfab top of pole PV mount (2) | 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

                  solar: http://tinyurl.com/LMR-Solar
                  gen: http://tinyurl.com/LMR-Lister

                  Comment


                  • #10
                    well as for now in market
                    cree power led 1 watt led can give you 100 lumens
                    so lets say 24 so you can distribute them in the room to have a better balanced of light all acrross

                    each led will cost around 6 euro
                    but this leds is not a complete lamp
                    so you will need housing and a cooling element
                    that will take you up around 10 euro per lamp to make

                    CREE XP-G R5 Emitter
                    Lumen min.: 139
                    V min.: 2,9 V
                    mA min.: 350 mA
                    watt: 1.015 watt

                    efficiency lumen-watt 137

                    so if you store the power in a 12volt batteries you can make 6 strings of 4 leds in series to
                    which means you will draw at 12v 2.1 ah

                    you can use a dc dc converter to be sure that the voltage sent to the lambs is close to that value

                    so you will need
                    24 cree led 5.70 euro each 137 euro
                    http://www.mini-box.com/DCDC-USB-200
                    is a dc dc converter high efficiency cost 60$
                    you need the housing of the leds and the cooling element that will be less that 5 euros per led another 120 euro

                    and you are done enjoy

                    Comment


                    • #11
                      Inputs...

                      Dear All,
                      Sorry for late reply,
                      Following are the inputs from my side.
                      -------------------------------
                      led's will be used 6 to 8 hours per day
                      Sunlight is full in India most of the times.
                      For 2400 lumens I am planning to use 2400/30 = 80 Led's of 0.5 Watt (8 MM) each led gives 30 lumens, this led's are available in India for 0.03 to 0.05 usd/led - (4led's in series - so 12 volt for 4 led's) each led voltage is 3 volt.
                      Room / Classroom will be used by students for reading activity
                      ---------------------------
                      Thanks
                      Sameer Naik

                      Comment


                      • #12
                        Originally posted by Sameer View Post
                        Dear All,
                        Sorry for late reply,
                        Following are the inputs from my side.
                        -------------------------------
                        led's will be used 6 to 8 hours per day
                        Sunlight is full in India most of the times.
                        For 2400 lumens I am planning to use 2400/30 = 80 Led's of 0.5 Watt (8 MM) each led gives 30 lumens, this led's are available in India for 0.03 to 0.05 usd/led - (4led's in series - so 12 volt for 4 led's) each led voltage is 3 volt.
                        Room / Classroom will be used by students for reading activity
                        ---------------------------
                        Thanks
                        Sameer Naik
                        If those LEDs provide enough light for the students to read, you would be consuming about 320 watt hours daily (80 x .5watt x 8 hours = 320 watt hours).

                        A safe size for that 12volt FLA battery would be ~ 135 Ah ( 320wh / 12v = 27Ah x 5 days = 135 Ah). That is about a 20% DOD each day.

                        Unfortunately that 150 watt panel can only charge a 100Ah battery so you would be discharging it > 25% which will cut it's lifespan.

                        So you can either increase the solar panel wattage to 2 of those 150 watt panels and go with a 150Ah battery or take a chance that you don't kill that 100Ah battery too soon.

                        Remember that when using 12volts it will be easy to get a high voltage drop if you do not use big enough wire from the battery to the farthest LED group.

                        Comment


                        • #13
                          Originally posted by SunEagle View Post
                          If those LEDs provide enough light for the students to read, you would be consuming about 320 watt hours daily (80 x .5watt x 8 hours = 320 watt hours).

                          A safe size for that 12volt FLA battery would be ~ 135 Ah ( 320wh / 12v = 27Ah x 5 days = 135 Ah). That is about a 20% DOD each day.

                          Unfortunately that 150 watt panel can only charge a 100Ah battery so you would be discharging it > 25% which will cut it's lifespan.

                          So you can either increase the solar panel wattage to 2 of those 150 watt panels and go with a 150Ah battery or take a chance that you don't kill that 100Ah battery too soon.

                          Remember that when using 12volts it will be easy to get a high voltage drop if you do not use big enough wire from the battery to the farthest LED group.
                          SE - this gives 2 to 3 days of autonomy, if you plan not to go below 60 to 40% SOC with FLA, correct?

                          The OP originally asked about "battery type" - which made me think initially about chemistry. Based on the little I know, both generally and about his application, it isn't evident that he would want or need to go outside the FLA box for this application.

                          Comment


                          • #14
                            Originally posted by Living Large View Post
                            SE - this gives 2 to 3 days of autonomy, if you plan not to go below 60 to 40% SOC with FLA, correct?

                            The OP originally asked about "battery type" - which made me think initially about chemistry. Based on the little I know, both generally and about his application, it isn't evident that he would want or need to go outside the FLA box for this application.
                            When I suggested to the OP not to go more than 20 to 25% DOD I was referring to an FLA chemistry battery because any more of a discharge will shorten the battery life.

                            Also based on his location I am not sure about the availability or cost of any other type of battery like Lixxxx.

                            If the OP had a large PV array he could go with AGM but again the cost may outweigh the ability to quickly charge and discharge.

                            My concern is the OP will determine that 2400 lumens is not enough light for the students to comfortably read and will end up using more LEDs and more watt hours then originally estimated. That will surely drain the battery faster.

                            Comment


                            • #15
                              I apologize for late reply, Following are inputs form my end

                              Hi, I apologize for late reply.
                              In India (especially in Pune) Due to "Ganesha Chaturthi" it was holiday for 2 to 3 days, so I was not able to check online.
                              Link - https://en.wikipedia.org/wiki/Ganesha_Chaturthi
                              I am new to Solar technology, so I may not be aware of all the things.
                              As I see in reply given by Sun - Eagle -> 2400 lumens may not be sufficient for students to comfortably read.
                              So assuming room of (12 ft length X 12 ft Width X 10 ft Hight) - How much lumens will be required for comfortable reading.
                              Also why DC to DC converter is required.
                              Which charging circuit / kit / mechanism will be suitable.
                              I have selected 150AH Battery - Link - http://www.ebay.in/itm/221860150292?aff_source=Sok-Goog
                              Is this battery fine?.
                              Initially I need to fix following things for my project.
                              1. lumens
                              2. Led type
                              3. Battery type
                              4. Solar panel type
                              5. Circuit, kit, Charging mechanism, overcharge prevention, Over discharge Prevention,
                              6. DC to DC converter
                              7. Voltage Drop Prevention

                              For Room (12 ft length X 12 ft Width X 10 ft Hight) & For Reading Purpose. Sunlight is sufficient in India in Tamil Nadu

                              Since this is a kind of social work for schools located far from cities, I need to keep the cost of project minimum.

                              Thanks
                              Sameer Naik

                              Comment

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