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Thread: Solar Tracker 5 - Various Questions

  1. #21
    Senior Member Faraday88's Avatar
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    Solavei
    Quote Originally Posted by Aaron Murakami View Post
    Hi Luke,

    12 volts is to extend battery life.

    Amorphous is best if you can get them in the right specs because you get power in low light conditions and they beat crystalline hands down in real world tests, period.

    Our charge controllers will still work regardless of the panels you get.

    Your solar guy is giving you really bad info if he says don't parallel and series the batteries. If you have a 12 volt battery, the middle cells can and will go bad. If you have 6 volt batteries in 12 volts strings and parallel those to up the amp hour rating, you help prevent the middle cells from going bad because you do "hardwire the equalization" into the bank. It is better than not doing it and I doubt your solar guy has ever done the test to find out.
    Hi Aaron,
    I admire your explanation it is so succinct and up to the point..
    However, unfortunately for me i see that Solar /Wind Energy generation as applied to its storage /and from its reusage front using Batteries is concerned.. Our country is still in the Medival ages as for as the enlightment on the Bedini/Tesla Technology is concerned.
    the Goverment here is focusing on the Power resale schemes to companies in order to encourage Renewable Energy sector and the Green Technology babbles..
    as we all know OTG concept is meaningless without the Bedini/Tesla Technology.
    but with the Batteries having their roles to play in these systems, the Goverment's intent for power resale scheme get very controversial while on the other hand de-centrialzed Power systems with OTG concepts will definitly be not encouraged or worst will face suppression..
    how do you see this scenario?
    Rgds,
    Faraday88.
    Last edited by Faraday88; 06-02-2017 at 07:50 AM. Reason: addition
    '' A Theory cannot precede a series of Experiments..unless one experiment
    debunks many theories''

  2. #22
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    Hi Aaron,

    so I have done some more tests and it seems like the unit is overheating. When it is cooler or I take the top off the unit it floats the batteries at around 30.7v. As the unit starts to get hotter the float voltage starts to increase.

    As you can see in the photo. when the fan failed the unit got so hot that the flux has come out of the solder on those components. Do you think that those components could be damaged and that is what is causing the unit to malfunction?

    IMG_20170602_141118.jpg
    IMG_20170602_141813.jpg

  3. #23
    Networking Architect Aaron Murakami's Avatar
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    Quote Originally Posted by Luke-es View Post
    Hi Aaron,

    so I have done some more tests and it seems like the unit is overheating. When it is cooler or I take the top off the unit it floats the batteries at around 30.7v. As the unit starts to get hotter the float voltage starts to increase.

    As you can see in the photo. when the fan failed the unit got so hot that the flux has come out of the solder on those components. Do you think that those components could be damaged and that is what is causing the unit to malfunction?


    I'm sorry, I do not know what the problem might be. Is there a way to put multiple fans on the unit instead of just one?
    Aaron Murakami





    You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete. ― Richard Buckminster Fuller

  4. #24
    Hi Luke-es,

    In the video you said you changed the fan. Check the direction of the fan's airflow and make sure it is getting the hot air out of the unit, not blowing into the unit.

    Regards
    Lman

  5. #25
    Senior Member John_Koorn's Avatar
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    Quote Originally Posted by Lman View Post
    Hi Luke-es,

    In the video you said you changed the fan. Check the direction of the fan's airflow and make sure it is getting the hot air out of the unit, not blowing into the unit.

    Regards
    Lman
    Sorry Lman, that's incorrect.

    You want the fan blowing cool air into the unit and pushing the hot air out the vent holes.

    John K.

  6. #26
    Hi John K,

    There are indeed different methods of cooling, but I am not convinced that what you said is applicable in this case here.
    As I can see, on the bigger trackers the venting holes are on the bottom of the units, and nothing on the top. How is the hot air forced to go down as there is no special arrangement for that ?
    When the hot air is taken outside it is replaced by cooler air entering the vent holes on the bottom, and lowering the local ambient temperature around the devices.
    As Luke-es said that taking the top off the unit seems to resolve the problem, I think that reversed airflow could be the problem, and the hot air be trapped inside.

    By the way, getting the hot air out of the unit is taking the advantage of the natural air convection. This is how the CPU inside a PC is cooled, PC power supplies, most of the laptops, audio amplifiers, and other devices.
    I am talking from the little experience I have in cooling and lowering the noise floor of some machines.

    Regards
    Lman

  7. #27
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    Quote Originally Posted by Lman View Post
    Hi John K,

    There are indeed different methods of cooling, but I am not convinced that what you said is applicable in this case here.
    As I can see, on the bigger trackers the venting holes are on the bottom of the units, and nothing on the top. How is the hot air forced to go down as there is no special arrangement for that ?
    When the hot air is taken outside it is replaced by cooler air entering the vent holes on the bottom, and lowering the local ambient temperature around the devices.
    As Luke-es said that taking the top off the unit seems to resolve the problem, I think that reversed airflow could be the problem, and the hot air be trapped inside.

    By the way, getting the hot air out of the unit is taking the advantage of the natural air convection. This is how the CPU inside a PC is cooled, PC power supplies, most of the laptops, audio amplifiers, and other devices.
    I am talking from the little experience I have in cooling and lowering the noise floor of some machines.

    Regards
    Lman
    I made sure that the fan was going the same way as the original fan and checked this with Aaron. The fan indeed blows air through the heatsink and out the other side. I think that those exit holes are too small anyway.

    I have the unit running wihtout the top on and its not actually any better now. I have run a couple more tests and the only way to get the charger to float at 30.7 as it used to is to turn half of my array off so its only receiving 1200 watts instead of 2400.

    It looks like the charger is having a hard time limiting the amount of current going through and its not dropping into float. I dont think it is the heat i think something has been damaged when the fan burnt out.

    I need some help from whoever helped John Bedini to build these so that i can troubleshoot the part that is damaged and change it.

  8. #28
    Senior Member John_Koorn's Avatar
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    Quote Originally Posted by Lman View Post
    Hi John K,

    There are indeed different methods of cooling, but I am not convinced that what you said is applicable in this case here.
    As I can see, on the bigger trackers the venting holes are on the bottom of the units, and nothing on the top. How is the hot air forced to go down as there is no special arrangement for that ?
    When the hot air is taken outside it is replaced by cooler air entering the vent holes on the bottom, and lowering the local ambient temperature around the devices.
    As Luke-es said that taking the top off the unit seems to resolve the problem, I think that reversed airflow could be the problem, and the hot air be trapped inside.

    By the way, getting the hot air out of the unit is taking the advantage of the natural air convection. This is how the CPU inside a PC is cooled, PC power supplies, most of the laptops, audio amplifiers, and other devices.
    I am talking from the little experience I have in cooling and lowering the noise floor of some machines.

    Regards
    Lman
    Hi Lman,

    It's the inherent nature of "wind chill" and "air pressure" that determines that the air flow should move from the outside to the inside of the device.

    As an estimate, for every 10km/h of wind speed there is a 1 degree Celsius drop in air temperature. So if the fan is blowing air at 50km/h there's going to be about a 5 degree Celsius differnce in temperature between the air entering the fan and the air exiting the fan.

    Given that the air pressure inside the device is also a lot higher than the outside air because of the air being forced into it by the fan, any air (hot or cold) will be forced out of the vent holes.

    John K.

  9. #29
    Solavei
    Quote Originally Posted by John_Koorn View Post
    Hi Lman,

    It's the inherent nature of "wind chill" and "air pressure" that determines that the air flow should move from the outside to the inside of the device.

    As an estimate, for every 10km/h of wind speed there is a 1 degree Celsius drop in air temperature. So if the fan is blowing air at 50km/h there's going to be about a 5 degree Celsius differnce in temperature between the air entering the fan and the air exiting the fan.

    Given that the air pressure inside the device is also a lot higher than the outside air because of the air being forced into it by the fan, any air (hot or cold) will be forced out of the vent holes.

    John K.
    Hi John K,

    I agree with what you explained here, although I am a little surprised it is realized that way. But I know that John Bedini would have made it differently, if he thought it needed to be done. Probably at a little higher cost though.

    Well, I must admit that my assumption about the airflow of the fan was wrong, since Luke-es has it confirmed now by Aaron as well. And the more important is that he has installed the fan the correct way, as you said it should be. So he can rule out this as a possible reason for the problem and look somewhere else for the disturbance of his unit.


    Regards
    Lman

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