In my eternal quest to make a decent cup of coffee at my parents' house, with an induction stove and moka, I recently discovered an interesting problem.
Having found a good heat setting for the hob (that doesn't superheat the water instantly and boil it dry in ~20 seconds), I found that the hob attempts to maintain thermostatis by cycling the power on and off. This may work fine for a large pot of boiling water, but for the moka pot this means I get a few seconds of extraction, followed by a few seconds of water being sucked back down the wrong way as the pressure decreases, then forwards, then back, etc.
Is there any way of overcoming this? Is it even likely to cause a problem with the extraction?