Hi John, to start you have to eat the build cost, but in 6 months you recover the cost in what you no longer buy from the stores. After that it's all savings from eating what you grow and not having to buy anymore. I explain a bit of that in my previous posts, and will do more as I go along. When everything is growing at capacity here, it equates to around $200/m on average in savings after cost of electricity and nutrients.
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