For the people that wish to experiment, I have build a small calculator, its a dot net app.

Its basic, just follow the prompts. Download link below:

This does the same as calculating this out long hand:


   Chris Sykes
       hyiq.org

I should point out, the Battery Charge Test Calculator is meant to be used as a Guide and is not guaranteed to be completely accurate.

Completely accurate measurements will require expensive equipment.

However, this calculator uses Industry standard equations used by professionals around the world!

Some good reading: How to calculate battery run-time

   Chris Sykes
       hyiq.org

Quote from: wistiti on October 12, 2016, 01:55:11 PM

May i suggest you for your next build to wind your coil on a hollow core... This way you can slide the ferrite inside for fine tuning. 

By the way the credit for this circuit goes to Skywatcher http://www.energeticforum.com/renewable-energy/19931-bucking-coil-inverter.html

Yes thanks for the idea!

Actually I have done several setups all these days... The last setup i testing right now is this in photo..2 batteries... it light a resistive bulb 220v (Watt unknown I think its ~20Watt). I added 2 double bucking coils on the same ferite and tuned too.. Unfortunately I don't have a single working multimeter.. All are burned I order new ones and waiting

Nice!
Do you still running the primary with a kindof joulethief circuit?

Quote from: wistiti on October 15, 2016, 04:01:52 PM
Nice!
Do you still running the primary with a kindof joulethief circuit?

Yes! exactly the same circuit..

The two bic coils in photos are actualy 4 coils, 2 backing coils. They have many turns so the voltage is high.. I got sparks and I got electoshocked a few times 

I got two outputs now.. the old one and the new one from the combine of the new 2 pairs of bucking coils.. the new output is much stronger.. I can use both outputs the same time but they share the magnetic juice so they are dimmer when connected both. (old output connected to 220v led bulb (small one).

The new pairs of coils are side by side (1cm spaced due to extending plastic ).. and both above the side which is without the bifilar primary.
By moving them along the ferite change frequency and output too.. So tuning is wanted.

I wiil post the circuit (new connections) tomorrow