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- Aug 15, 2013
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A 32 volt bucking capable of carrying 28 amps will be around 900 watts. A substantial transformer. New cost would be close to $200.
http://www.newark.com/hammond/1182u30/transformer-toroid-60v-1kva/dp/54X7560
You only need a 7.5 kva since the transformer only carries part of the load. Still about $125.
The muffle furnace is rated at 3.8 kva. I calculated the power requirement for a bucking transformer from the bucking voltage x the rated current draw; 32 volts x 28 amps = 896 watts.
If you check out the transformer recommended by the calculator (1S46F), you'll find that it is a 1 KVA transformer capable of bucking or boosting a 7.5 KVA load. It is not a 7.5 KVA tranformer. RJS's calculation is correct. A 1 KVA buck/boost transformer will handle the OP's application.
Tom