no worries, it is a very good question. Many people put bananas in their compost, because of the heavy K in them. Fermenting could unlock that nutrient into a potent supplement, although I think the eggshell fermentation produces a better all around product for our plants. If I were to ferment banana peels, I would be aware of fruit's natural byproduct, alcohol... and I would use a combination of fermentation with sugar, while also using lactobacillus serum to eat up the alcohol. Plants can stand a bit of alcohol, because it does occur in nature... but you wouldn't want to pour a large amount on them. Lacto can be used to create a more pure nutrient supplement and break down the organic components into their base elements in a container or in the compost pile, and deal with nasty odors and alcohol production. It is for this reason that lactobacillus serum is considered to be the workhorse of the natural organic gardener.