Making a Big OzInverter
Hi,
I am putting together my No 2, Big OzInverter.
I have a couple of questions about the toroid.
Yes, I have read most of all ‘oztules’ 60,000 words of wisdom, he has gratefully posted on 3 forums. I thought that I had understood the toroid concepts. But sadly my head is still spinning a bit.!
My No 1, 6kW OzInverter, 48vdc to 230vac 50HZ, works fine and does everything I wanted. ........The cores were 2off 190mm outside diameter x 90mm centre hole and each core was 60mm high. These were stacked together, so the rectangle section through the core was 50mm x 120mm high. 4off /4 in hand, 1.8mm diameter at 118 turns Secondary, and 50mm/2, 14 turns, Primary.
My No 2, OzInverter, will be for the final installations here in Normandy, and will incorporate a better metering system. The cores will be 130mm outside diameter, 100mm diameter centre hole and each at 70mm high, stacked together that gives me a rectangle section of the core 65mm x 140mm high. That’s just over 30% more core mass.
Question, ….. Does this 30% more mass mean a proportional increase in the secondary windings, ie, should the 4off/4 in hand 1.8mm diameter, now be 158 turns. Or can I get away with less turns and save copper losses?
Or is the extra copper/turns, only proportional to the outside diameter increase and not the height, so the increase of turns would be about 20% in this case.
Question, ….. I am using 75mm/2 for the Primary, again is there a proportional rise in the number of turns to say 18 turns. ?
Thank you.