Bedini SG

[Sephiroth]

Does anyone know what would potentially be a better diode than the 1N4007?

I need a ridiculously fast switching diode with low voltage drop

[EgmQC]

Does anyone know what would potentially be a better diode than the 1N4007?

I need a ridiculously fast switching diode with low voltage drop

Hi Sephiroth,

look at Mouser, Rectifiers

you can search by criteria, that saved me alot of time.

Best Regards,
Eric

[Pcurrius]

coil collapse

Hello everyone!

I would like to know if anyone could give me some links or some bibliography about the coil collapse concept. As I understand this concept is also typical in our CEE but they assume it as useless, isn't it? I would like to study it vastly and I just can't find information. So I would please anyone contribution. Thanks!

[gyula]

Does anyone know what would potentially be a better diode than the 1N4007?

I need a ridiculously fast switching diode with low voltage drop

Hi,

I noticed Eric shows an excellent link for your question but there exists an improved version of the 1N4007: it is the UF4007 -the fast version. See here its data sheet: http://www.fairchildsemi.com/ds/UF/UF4007.pdf

Your wish for low voltage drop can be fulfilled with Schottky type diodes but not yet in 1000V reverse voltage range.
The really fast and ultra fast diodes are mainly silicon diodes and as such their voltage drop cannot be less than 0.7-0.8V and even higher if forward current increases. Unfortunately, I am not aware of lower than this voltage drop say at 1A current if you look for a 1000V reverse voltage rated Schottky diode.

rgds, Gyula

[Shamus]

Ask an ye shall receive...

I would like to know if anyone could give me some links or some bibliography about the coil collapse concept.

Try here: Inductors and calculus : INDUCTORS

Of note is the equation near the top that they call "'Ohm's Law' for an Inductor":

v = L(di/dt)

In english, this means that the voltage is equal to the coil's inductance in Henrys times the rate of change of current with respect to time. So as dt (the time span) gets smaller and smaller, v get bigger and bigger. Something to ponder. Also of note is a little experiment near the bottom of the page which directly relates to your question.

[kick-bak]

Thanks for the explanation Shamus. I've found quiet often that I have looked past some posts due to the over technical terms( for me ) used in them.

I was using a IN4148 between the E/B of my first SG and it was probably my highest rpm machine i've built.

[Guruji]

Battery charging

Hi guys what is the last reading voltage when charging a battery with bedini circuit 14v?
Thanks

[hh1341]

Amp Hrs

Hi everyone !

I'd like to supply a 1000 Watts 120 Volts inverter with 12 Volts batteries at C-20 rate.

So, I'd need a 1667 Ah battery bank, right?

Thanks !

Michel

In my real world testing, you would probably need more like 2000 Ahrs.
I find I draw 10 amps from a 12 volt bat, for every 100 watts used @ 120 v.

Remember that a system should be over built by a factor of 2. (twice the capacity than required.) (for long life.......be kind and gentle to your Batts)
So ideally, your system should have 4000 amp hrs.
That would be eight 530 6 volt Surrettes at $350 apeace.(ouch......$2800)

Carl

[Druide]

Amps hr

In my real world testing, you would probably need more like 2000 Ahrs.
I find I draw 10 amps from a 12 volt bat, for every 100 watts used @ 120 v.

Remember that a system should be over built by a factor of 2. (twice the capacity than required.) (for long life.......be kind and gentle to your Batts)

Carl

I guess there's some power loss (heat etc.) in the inverter itself. For recharging such a battery bank, I'll need a very efficient SSG. I'm building a four coils 8 transistors energizer with 3 bifilar 315 feet 20 AWG litzed wire and a trifilar 23 AWG trigger and 2 X 20 AWG litzed, do you think this will do the job or should I go for more coils or bigger wire size ?

Thanks.

Michel

[Sephiroth]

It will charge them but it will take forever.

I reckon an 8 transistor 4 coil SSG would probably draw around 2 amps.

The C20 rate of a 2000ah battery bank is 100 amps!

Assuming your SSG is charging one to one it would take over 40 days to fully charge the bank from empty, but if you are only using 20% of the battery's capacity then it will be more like a week

[dambit]

I guess there's some power loss (heat etc.) in the inverter itself. For recharging such a battery bank, I'll need a very efficient SSG. I'm building a four coils 8 transistors energizer with 3 bifilar 315 feet 20 AWG litzed wire and a trifilar 23 AWG trigger and 2 X 20 AWG litzed, do you think this will do the job or should I go for more coils or bigger wire size ?

Thanks.

Michel

Hi Michel,

I built a charger pretty much the same as you describe. I built it to charge a bank of four 130 Ah batteries on an RV. It does the job, 24.2V to 26.5V in 24hrs, a little slow but these batteries are not fully conditioned. For batteries as large as you are talking about you will require a bigger unit. I am planning to run my pool filter and pump off a bank of batteries (around 400 to 500Ah) and the charger I am building for that has 20 transistors. I will need the batteries to supply power for up to 6 hours and then be ready to go again in 18 hours, so I figure this should be large enough.

Cheers,

Steve

P.S. the EFTV 6 dvd is great. I recomend it to all.

[Druide]

40 days recharging !

It will charge them but it will take forever.

I reckon an 8 transistor 4 coil SSG would probably draw around 2 amps.

The C20 rate of a 2000ah battery bank is 100 amps!

Assuming your SSG is charging one to one it would take over 40 days to fully charge the bank from empty, but if you are only using 20% of the battery's capacity then it will be more like a week

Yikes ! But I'm not sure these calculations apply here for this is not the current that charges the batteries with this type of energizer. I will build the 4 coils energizer and experiment with it and if it isn't powerful enough, I'll build a bigger one, I've just received 100 magnets I've ordered and I bought kilometres of magnet wire, it's much more cheaper in large quantities, almost 5 times cheaper for the wire !!!

Wish I had a scope to see what's happening in these circuits.

Except John Bedini, did anyone build an enegizer powerful enough to recharge such a battery bank ?

Thanks.

Michel

[Druide]

Hi Michel,

I built a charger pretty much the same as you describe. I built it to charge a bank of four 130 Ah batteries on an RV. It does the job, 24.2V to 26.5V in 24hrs, a little slow but these batteries are not fully conditioned. For batteries as large as you are talking about you will require a bigger unit. I am planning to run my pool filter and pump off a bank of batteries (around 400 to 500Ah) and the charger I am building for that has 20 transistors. I will need the batteries to supply power for up to 6 hours and then be ready to go again in 18 hours, so I figure this should be large enough.

Cheers,

Steve

P.S. the EFTV 6 dvd is great. I recomend it to all.

Hi Steve

Are your batteries 24 volts or are they 12 volts connected in series ?

Thanks

Michel

[dambit]

Hi Steve

Are your batteries 24 volts or are they 12 volts connected in series ?

Thanks

Michel

Hi Michel,

They are four 6V batteries connected in series. I charge all four at the same time as one 24V bank. I have the input of my charger connected to a 24V wall adapter. It makes things easier while conditioning and charging larger batteries.

Cheers,

Steve

[Druide]

Hi Michel,

They are four 6V batteries connected in series. I charge all four at the same time as one 24V bank. I have the input of my charger connected to a 24V wall adapter. It makes things easier while conditioning and charging larger batteries.

Cheers,

Steve

I use a wall adapter too for conditioning my batteries, actualy, salvaged printer power supplies. One 18,5 volts 1,1 amp for the trifilar SSG and one 17,5 volts 1 amp for the Imothep/Bedini energizer fan. I connect the two units' outputs to the charging batteries. I found that I have to retune the energizers if I use batteries instead, probably due to an impedance difference.



Michel