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from everywhere. It does work,” he states with conviction.
He opted for solar energy to heat his 275 gallon cooker—an upside down oil tank—but found that solar panels during winter months could generate only about 140 degrees while alcohol needed to be at 173 degrees to boil. Rocca said he bought a good vacuum pump, spending about SI,000, and with the vacuum, “Water boils at 134 degrees and alcohol at 122 degrees. Now the water coming off my solar panels is hot enough to do the job," he said. On cloudy days, Rocca said he uses a water jacket wood stove to heat the mash.
To further reduce his costs by reducing the amount of energy required to run the still, Rocca said he’s experimenting with chemicals that will kill bacteria so he can eliminate the need for keeping the mash at a rolling boil.
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