Hi Folks,

While waiting for parts to arrive for another project I ran some tests comparing Groundloops air core charger and a single coil Bedini SSG. I had only ever charged small batteries with this unit and never tried the large 200+AH batteries. I always had seen spikes of 200-220 volts when charging the smaller 12V @ 7AH batteries and so I figured (naively) that the larger batteries would also see these spikes. I hooked both the Groundloop charge and the Bedini up to single Trojan T105's each. Groundloop's charger was pulling 1.5 ampere and the SSG was pulling 85 Milliampere at best wheel speed etc.

Groundloop charger was charging slightly faster than the Bedini SSG, but both of them show no large spikes like the larger Bedini systems show, even on larger batteries such as I am charging. Now, both of the batteries I was charging were at high internal impedance so I figured I would see these larger (at least 100V or so) spikes. Baseline on the scope shows about 11.8 volts and the spikes I am showing are in the 5 volts above this base voltage. Input voltage has been run from 9 volts all the way up to 24 volts with no change in output regardless of tuning of the base current of the NPN (MJL21194).

My question is:

1. Obviously the high voltage spikes I have seen in the Bedini systems are using larger coils, but is this the key? In order to charge these larger batteries like is shown in the video of him charging the 2000+ AH bank, I would need to see these spikes, and in order to do that is the key more inductance, core size, or both?

2. Do I simply need to add more coils and expect to see a summing effect from each coil thus increasing the potential of these spikes?

3. Is it possible that the circuit I have built needs further tuning in order to increase the potential of these spikes?

4. Is it a matter of building a large Bedini system like shown in his latest video which uses Litz wire for coils and 10 coils and 20 magnetic poles?

5. Does anyone have any design data for this particular unit?

Any input is deeply appreciated...

Ok Thanks. So this master slave schematic is on the Bedini Monopole advanced group? The larger coil sounds like a good plan and I could always go multi-coil by adding more of them as well. I have my machine setup to take up to 6 coils but I would need to switch to larger ceramic magnets I suppose in order to properly fire the larger coils.

I have been using black sand cores (actually lab grade FE304 powder) and found very very good results compared to R60 rods and such, have you found this as well? Current drops, coil does not even get warm, and the spikes are larger. Very interesting.

Yes, I'd like any suggestions you have. We are totally off grid with only a couple hundred watts of solar and a 1000 watt wind generator. All of our batteries are at least mildly sulfated, and I need to figure out a permanent solution to desulfation/charging that doesn't involve firing up a 50 horsepower diesel every couple days (even though it runs on veg oil). Thanks very much.

No, thats not exactly the one I had in mind, but good site to check out. PM sent UF

Ren