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  • i_ron
    replied
    Originally posted by i_ron View Post
    Here is the first run, seems to be working...

    Ron

    ]
    Charging a second battery from the generator

    Ron

    [IMG]image url[/IMG]

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  • i_ron
    replied
    Here is the first run, seems to be working...

    This is my Phil Woods 16/24 replication with Somaloy cores, modified as a motor generator... just running as a motor in this shot.

    Ron

    [IMG]image hosting 30 mb[/IMG]
    Last edited by i_ron; 07-17-2016, 10:38 PM. Reason: corrected spelling of Somaloy

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  • bobfrench@fastmail.fm
    replied
    Thanks for the info on the motor Matt.

    Thank you, Matt and Peter, for the SCR parameters.

    Bob

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  • Wistiti
    replied
    Originally posted by Peter Lindemann View Post
    Hey Guys,

    Back in 2004 and 2005 when I was working with John, we DID get some circuits to work with an SCR providing a Cap Dump. The conditions necessary for it to work required that the source of charge to the cap was in discrete pulses, such as the output from a relaxation oscillator, SG circuit, or the like.

    If the source charge to the cap is continuous current, then Matt is right, the SCR will not re-latch under normal circumstances. But IF there are discrete and periodic NULLS in the source current, (meaning that the voltage across the SCR drops to ZERO) then the SCR can re-latch and the SCR can be used to provide the cap dump.

    John also demonstrated the ability to turn SCRs off whenever he wanted to, but I have no idea how he did it. So, if you experiment in this area and get lucky, you might find something. Otherwise, trying to use SCRs in cap dump circuits are, as Matt said, "not a good choice."

    The point is, SCRs can be used to provide a cap dump control, but the methods have very strict limitations.

    I'm pretty sure that John's current Comparator Controlled cap-dump circuits use FETs to cut off the cap dump before the cap voltage equalizes with the battery it is being used to charge. FETs are definitely used in the 2A12 EX battery charger, which is a 24 volt cap dump charger for 12 volt batteries.

    Awesome thread guys!!!

    Peter

    Are you welling to share your experiment with us???

    Leave a comment:


  • Peter Lindemann
    replied
    SCRs and Cap Dump Circuits

    Hey Guys,

    Back in 2004 and 2005 when I was working with John, we DID get some circuits to work with an SCR providing a Cap Dump. The conditions necessary for it to work required that the source of charge to the cap was in discrete pulses, such as the output from a relaxation oscillator, SG circuit, or the like.

    If the source charge to the cap is continuous current, then Matt is right, the SCR will not re-latch under normal circumstances. But IF there are discrete and periodic NULLS in the source current, (meaning that the voltage across the SCR drops to ZERO) then the SCR can re-latch and the SCR can be used to provide the cap dump.

    John also demonstrated the ability to turn SCRs off whenever he wanted to, but I have no idea how he did it. So, if you experiment in this area and get lucky, you might find something. Otherwise, trying to use SCRs in cap dump circuits are, as Matt said, "not a good choice."

    The point is, SCRs can be used to provide a cap dump control, but the methods have very strict limitations.

    I'm pretty sure that John's current Comparator Controlled cap-dump circuits use FETs to cut off the cap dump before the cap voltage equalizes with the battery it is being used to charge. FETs are definitely used in the 2A12 EX battery charger, which is a 24 volt cap dump charger for 12 volt batteries.

    Awesome thread guys!!!

    Peter
    Last edited by Peter Lindemann; 07-16-2016, 04:15 PM.

    Leave a comment:


  • Matthew Jones
    replied
    Originally posted by [email protected] View Post
    Hey guys,

    Thank you all for your kind words and suggestions. Carroll's cap dump is great, I'll have to get it going again.

    The SCR triggered by a Zener works, but I think it won't work if the incoming voltage to the cap is higher than the Zener reverse voltage. Yes, the SCR latches closed as long there is current flowing, which allows it to fall below the Zener voltage and reset automatically. Very simple, just not for this situation.

    Matt, I'm winding one of your Razor Scooter modifications using the attached drawing. It says, "3 strands of 24 AWG". Is that 3 strands per turn (the 40 turns has 3 strands, the 30 turns has 3 strands) or is it one strand of 40 turns, then one strand of 30 turns, and one strand of 30 turns?

    Thanks,

    Bob
    Its just 3 strands all the time. I think the total was 100 turns.

    I am not sure who told you an SCR will work for a cap dump. An SCR gets turned on then stays on until the current stops flowing. If your isolating your Capacitor then you have to wait until the cap equalizes to the charge point. Then the SCR will shut off as long as the zener isn't holding it on. But if you are dumping straight from the source the SCR will not shut off.
    I am not avoiding solid state components because I know how they work. LOL. Someone lied to you if they said an SCR is a good choice.

    Matt

    Leave a comment:


  • bobfrench@fastmail.fm
    replied
    Hey guys,

    Thank you all for your kind words and suggestions. Carroll's cap dump is great, I'll have to get it going again.

    The SCR triggered by a Zener works, but I think it won't work if the incoming voltage to the cap is higher than the Zener reverse voltage. Yes, the SCR latches closed as long there is current flowing, which allows it to fall below the Zener voltage and reset automatically. Very simple, just not for this situation.

    Matt, I'm winding one of your Razor Scooter modifications using the attached drawing. It says, "3 strands of 24 AWG". Is that 3 strands per turn (the 40 turns has 3 strands, the 30 turns has 3 strands) or is it one strand of 40 turns, then one strand of 30 turns, and one strand of 30 turns?

    Thanks,

    Bob
    Attached Files

    Leave a comment:


  • dragon
    replied
    An update from post 1204, the MPPT controller didn't increase the return rate as I had hoped, it was slightly less than the original Buck converter test. The best run I've had with it was by controlling the pulse from the charged cap back to the battery bank. All 3 methods were less than my expectations for energy return. I plan to pursue the 2 battery switch and variations of this as this has exceeded my 80% return mark which gives me a path to achieve my 10amp goal.

    I'd like to thank Matt, Dave, and Bob for the inspiration that brought me to this point, if there is anything I can do for you let me know.
    Last edited by dragon; 07-15-2016, 09:20 PM.

    Leave a comment:


  • wantomake
    replied
    Similar

    Originally posted by [email protected] View Post
    Hey guys,

    I should have another Razor Scooter motor to modify today (UPS), and a part for my other one is coming from Dave Bowling, so maybe next week I'll have two of Matt's motors to test with. Also, I am expecting a rotor for a setup mimicking Dave's generator soon.

    Wistiti, I want to get away from solid-state components because I can't fix them and don't feel confident in checking them to find a problem when the system goes down, although I am pretty sure about things when I see smoke coming out of one. lol

    I was using a Boost Module with the inverter because the potential difference dropped so fast that the inverter couldn't function. But this only happens on a small system. My large solar battery bank is big enough that the inverter has no problem at all until the solar panels RAISE the voltage above of the inverter's range. At night, the charging batteries may go up into the 15Vs while the 24V set is sitting at 25.8V and then my refrigerator kicks on and pulls the potential difference below 10V. Other than that, it works fine.

    I said that to say that a larger system doesn't need a Boost Module to run an inverter between the positives. My plans are to do this and use two Bedini 2A12-EX battery chargers plugged into the inverter to keep the two Primaries up. We'll see. If that works, then we'll have to see how much more we can pull off the inverter -all of which would be free.

    I was positively impressed with running a transformer in series with a motor between the positives of the 3BGS. It didn't seem to adversely affect the overall performance. I was easily able to produce 30V to over 100V DC, but just putting that to the batteries doesn't work. It needs to go to a cap and dumped at 2-3 volts over the Primary. I was getting there until I did something that blew the cap dump that Carroll built for me. I'll need his help to fix it. (damn solid-state...just kidding)

    I have tried using a Zener to control the gate of a SCR and dump a cap, but the SCR seems to remain latched and the voltage of the cap just keeps rising. I'm guessing that the incoming high voltage from the transformer is doing this. I have used this arrangement before, but I guess the incoming voltage was always lower than the Zener value. Any suggestions?

    Good luck,

    Bob
    Hey Bob,
    My goals are similar to what you are doing.

    I too try to stay away from solid state. I have a modified Matt motor as generator driven by a stock my1016 motor. The solar panels are disconnected. I did receive a better boost converter from my daughter that is : "DC 8-60V to 10-120V 900W numerical control CC CV step up module with digital tube display, maximum current is 15A, with a fan to dissipate heat".

    The motor/generator setup runs between the positives, while the inverter(2k watt) runs off the seven in parallel #3 batteries. I get long runs with small loads. But as we back yard inventors do, I want to run my house off a AA battery.

    I did as Dave said, can balance the 3BGS to good long runs. Now attempting Matt's proposed way to have separate circuits working to power the charge batteries.

    Sorry not posting schematic or anything until I get something working.
    Thanks for all who help out here,
    wantomake

    Leave a comment:


  • voltan
    replied
    that's a neat dual battery jt circuit dragon. simple and efficient.
    cheers.

    Leave a comment:


  • Wistiti
    replied
    Originally posted by citfta View Post
    Here is the cap dump circuit Bob has been using.

    Leave a comment:


  • citfta
    replied
    Here is the cap dump circuit Bob has been using.
    Attached Files

    Leave a comment:


  • Wistiti
    replied
    Originally posted by dragon View Post
    This is a shunt regulator which could be re-purposed as a cap dump circuit. Generally used to dump energy without allowing a load ( like a wind turbine ) to run free - always loaded. I've built a few of these long ago and they work exceptionally well.
    Thank you very much Dragon for this circuit!
    So as i see it the input is on the left side (where the bat is) and the output is on the right side (where the 250w resistor is)... Is this correct?

    Leave a comment:


  • dragon
    replied
    Originally posted by Wistiti View Post
    Thank you Bob for the reply!
    Does some one here have some cap dump schematic to share? It can also be mecanic one...
    Thanks !
    This is a shunt regulator which could be re-purposed as a cap dump circuit. Generally used to dump energy without allowing a load ( like a wind turbine ) to run free - always loaded. I've built a few of these long ago and they work exceptionally well.
    Attached Files

    Leave a comment:


  • Matthew Jones
    replied
    Originally posted by [email protected] View Post
    Hey guys,

    I should have another Razor Scooter motor to modify today (UPS), and a part for my other one is coming from Dave Bowling, so maybe next week I'll have two of Matt's motors to test with. Also, I am expecting a rotor for a setup mimicking Dave's generator soon.

    Wistiti, I want to get away from solid-state components because I can't fix them and don't feel confident in checking them to find a problem when the system goes down, although I am pretty sure about things when I see smoke coming out of one. lol

    I was using a Boost Module with the inverter because the potential difference dropped so fast that the inverter couldn't function. But this only happens on a small system. My large solar battery bank is big enough that the inverter has no problem at all until the solar panels RAISE the voltage above of the inverter's range. At night, the charging batteries may go up into the 15Vs while the 24V set is sitting at 25.8V and then my refrigerator kicks on and pulls the potential difference below 10V. Other than that, it works fine.

    I said that to say that a larger system doesn't need a Boost Module to run an inverter between the positives. My plans are to do this and use two Bedini 2A12-EX battery chargers plugged into the inverter to keep the two Primaries up. We'll see. If that works, then we'll have to see how much more we can pull off the inverter -all of which would be free.

    I was positively impressed with running a transformer in series with a motor between the positives of the 3BGS. It didn't seem to adversely affect the overall performance. I was easily able to produce 30V to over 100V DC, but just putting that to the batteries doesn't work. It needs to go to a cap and dumped at 2-3 volts over the Primary. I was getting there until I did something that blew the cap dump that Carroll built for me. I'll need his help to fix it. (damn solid-state...just kidding)

    I have tried using a Zener to control the gate of a SCR and dump a cap, but the SCR seems to remain latched and the voltage of the cap just keeps rising. I'm guessing that the incoming high voltage from the transformer is doing this. I have used this arrangement before, but I guess the incoming voltage was always lower than the Zener value. Any suggestions?

    Good luck,

    Bob
    As long as current is flowing to an SCR the SCR will stay on. SCR is not a good choice for a cap dump.

    Matt

    Leave a comment:

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