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  • VictorB97 commented on antoniraj's instructable Make Energy From Weeds7 months ago
    Make Energy From Weeds

    I love the idea of using alternative sources of energy, yet I have to really question if all this is worth it; perhaps there's a better way. This might be a fun experiment yet is it practical? How many years of bio gas will it take just to pay for the equipment? From the description numerous years to recoup that cost alone. Then there is the use of power, both electrical and human, a lot of total watts, or calories where expended for the machines and processes needed. Even at minimum wage (or enough to pay for your lunch) it is not worth it. Much more was put in than gained.I have long lamented why the farming community has not done large scale recovery of gases. Cows give off methane (70 and 120 kg of Methane), so does manure, even silos...yet there is no significant capture in the US ...see more »I love the idea of using alternative sources of energy, yet I have to really question if all this is worth it; perhaps there's a better way. This might be a fun experiment yet is it practical? How many years of bio gas will it take just to pay for the equipment? From the description numerous years to recoup that cost alone. Then there is the use of power, both electrical and human, a lot of total watts, or calories where expended for the machines and processes needed. Even at minimum wage (or enough to pay for your lunch) it is not worth it. Much more was put in than gained.I have long lamented why the farming community has not done large scale recovery of gases. Cows give off methane (70 and 120 kg of Methane), so does manure, even silos...yet there is no significant capture in the US except for some landfills. Could it be that it is just not very economical?I understand that in some 3rd world areas, they now take a bag of cow dung, seal it around a tube and use the off gas for cooking...perhaps that would be better, yet I don't see either catching on well here.

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