I mean "up to three", as I have three of them IIRC. The "wattage" of each is 300 W @ 120V. I have no idea what is the RMS voltage output of my BPC coil with a reasonable load... have yet to try the BPC coil over the induction cooker. Yes, I expect they are nichrome - two turns, 1" diam. Your suggestions are welcomed.
Ok A couple of points to consider. If the BPC turns equals the turns of the internal cooker coil, then you have a 1:1 air core transformer and you should get approximately the equivalent of the line voltage as the voltage output of your BPC, so driving a single immersion heater should be ok. You may be able to drive two or three in parallel to get a better power transfer. If the BPC turns are a lot greater than the induction cooker coil, you will have some step up ratio of voltage based on the turns ratio. This could be excessive for a 120 Volt immersion heater. You may need to start with two in series. As for the two turns you see on your immersion heater, that is just the outer casing. Internally there are probably many turns wound on a mandrel and swaged (drawn down in diameter) into the heater casing with an insulating ceramic powder, so the inductance could be higher than expected. For safety, maybe start with one heater and a 2.5 amp fuse in series with it. 300W/120V=2.5 Amps. If this blows you know your voltage output is higher than 120.
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