An electric kiln draws a large, steady load for many hours, and bigger studio kilns can need their own dedicated supply. A firing to stoneware temperature can take most of a day, then cool for another. Even a smaller kiln can take up a big share of 15 kW continuous, leaving little for the house, and a large one can exceed it outright. That makes it a poor match for a system designed to run an average home.
A full firing uses a lot of energy, and every kilowatt-hour from the hydrogen store cost more than three to put in, because round-trip efficiency is 30% or less. Spending a store meant to keep the fridge, freezer and heat pump going for days on one firing is rarely sensible. Kilns should fire on grid power, ideally scheduled for off-peak, and the system should be kept for the house.
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It can keep the rest of the studio going: the wheel, the pug mill, the lights, the heat pump that stops work drying too fast in winter, and the house. A small test kiln may fit in pilot sizing. A large kiln would need a much bigger setup, and for most potters, it is not a fit. If a firing is interrupted by an outage, follow the kiln maker's advice, as a restart may not save the load.
Usually not sensibly. Larger kilns can exceed 15 kW continuous on their own, and even smaller ones take a big share for many hours. Most kilns would need a much bigger setup or are simply not a fit.
Possibly, if the house load is light at the time. That would be checked in pilot sizing. Round-trip efficiency of 30% or less still makes firing on stored hydrogen expensive.
Follow your kiln maker's advice on interrupted firings. The system keeps the studio and house running, but it is not designed to carry a large kiln through a full firing.
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