Connected ZVS driver which works fine with 2x 5 turns on flyback primary-draws less than 100mA with small load, but when tried with 2 x 2 turns of wires arounf room 5m x 4m + smaller 3m x 4m it draws 2.75A from 12.3V car started battery?
Calculated
Inductance: Rectangular Loop which uses this formula
I've got for bigger 5m x 4m room ~120uH, than when added wires resistance at decent switching frequency I should get current draw below 0.5A, so I do not know, maybe this cable aluminium decent shield makes them useless while creates Eddy currents which make such big current draw?
Probably I didn't shorted this aluminium shield around room into another loop, which could be not too good-need to check this...
Total length of one loop around two rooms is ~30 meters, so two turns are ~60meters, but thin 0.5mm copper was used for the moment.
There are four such wires in this cable, so I've connected two of them to create splited two 2 turns coils-similar to flyback primary...
Those four thin wires (total resistance ~3.9 Ohm per two turns?) is shielded by aluminium with additional good insulation...
It is not brand new cable-probably I will have to calculate its resistance per meter and compare with AWG datasheets.
Why so huge current draw from 12V battery? I energize something inside the room? There is steel 2 m high fireplace...
Not sure for the moment about this insulated in plastic wires, so probably I will test with 2.5mm2 copper 230VAC rated wires, since this resistance looks too high using this salvaged four wires cable in aluminium shield....
Anyway, this aluminium shield wires maybe will be good for another negative ions generator project which was the main purpose to put those wires around room at the bottom
BTW: I've forgot to turn on AM radio to see if it creates some higher frequency noise
Update: when calculated estimated [Ohm/m] used wire resistance I've got for ~120m total of wires ~0.067 Ohm/m, so very close to AWG 23 using this
AWG chart it looks like ~0.6mm in diameter copper wire which is something similar to what I have, so nope, used wires resistance looks good at its gauge
My suspect is this bloody aluminium shield around those four wires inside