Originally Posted by
rtckjc
I ripped this from another site. It sound like a very reasonable idea. WINTER OPERATION -
ALWAYS PRE-MIX the electrolyte in an open container when adding denatured alcohol to the Sodium Hydroxide and distilled water. Let the mixture sit, uncontained/uncapped, for about 30 minutes before adding the mixture to the MileageMaker device.
The cell, like other pieces of equipment utilizing H2O that is exposed to below freezing elements, must be protected from freezing hard during cold weather. This can be accomplished by adding denatured alcohol in order to achieve a 5% to 15% alcohol solution. A 5% solution (about 8 liquid oz. per gallon of water) will protect against a hard freeze down to about 10º F.. A 10% solution (about 13 liquid oz. per gallon of water) will protect against a hard freeze down to about 0º F.. A 15% solution (about 21 liquid oz. per gallon) will protect against a hard freeze down to about -15º F.. 28 ounces per gallon will protect to about -30ºF..
For below-freezing initial start-up: Mix 1 gallon distilled water, denatured alcohol (8 to 28 liquid oz.), and Sodium Hydroxide 32 oz. by weight, in an open container and let the mixture sit open for 30 minutes before closing or transferring the mixture to a closed container. There will be an initial reaction causing the mixture to get very warm and expand, so keep the mixing container open to accommodate the heating and expansion, before capping the mixing container or adding the mixture to the cells.
When the cell requires replacement electrolyte for continued below-freezing operation, be sure to include 8 to 28 liquid ounces of denatured alcohol with each gallon of distilled water, along with 1/2 ounce by weight (about 1 teaspoon) of Sodium Hydroxide in the replacement water to maintain the 5% to 15% alcohol solution and replace any Sodium Hydroxide in the cells, which may have been neutralized with use.